SmartDNS is a local DNS server. SmartDNS accepts DNS query requests from local clients, obtains DNS query results from multiple upstream DNS servers, and returns the fastest access results to clients.
Avoiding DNS pollution and improving network access speed, supports high-performance ad filtering.
Unlike dnsmasq's all-servers, smartdns returns the fastest access resolution. （read more）
Support Raspberry Pi, openwrt, ASUS router, Windows and other devices.
- SmartDNS
Ali DNS
Use Ali DNS to query Baidu's IP and test the results.
pi@raspberrypi:~/code/smartdns_build $ nslookup www.baidu.com 223.5.5.5
Server: 223.5.5.5
Address: 223.5.5.5#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 180.97.33.108
Name: www.a.shifen.com
Address: 180.97.33.107
pi@raspberrypi:~/code/smartdns_build $ ping 180.97.33.107 -c 2
PING 180.97.33.107 (180.97.33.107) 56(84) bytes of data.
64 bytes from 180.97.33.107: icmp_seq=1 ttl=55 time=24.3 ms
64 bytes from 180.97.33.107: icmp_seq=2 ttl=55 time=24.2 ms
--- 180.97.33.107 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 24.275/24.327/24.380/0.164 ms
pi@raspberrypi:~/code/smartdns_build $ ping 180.97.33.108 -c 2
PING 180.97.33.108 (180.97.33.108) 56(84) bytes of data.
64 bytes from 180.97.33.108: icmp_seq=1 ttl=55 time=31.1 ms
64 bytes from 180.97.33.108: icmp_seq=2 ttl=55 time=31.0 ms
--- 180.97.33.108 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 31.014/31.094/31.175/0.193 mssmartdns
Use SmartDNS to query Baidu IP and test the results.
pi@raspberrypi:~/code/smartdns_build $ nslookup www.baidu.com
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 14.215.177.39
pi@raspberrypi:~/code/smartdns_build $ ping 14.215.177.39 -c 2
PING 14.215.177.39 (14.215.177.39) 56(84) bytes of data.
64 bytes from 14.215.177.39: icmp_seq=1 ttl=56 time=6.31 ms
64 bytes from 14.215.177.39: icmp_seq=2 ttl=56 time=5.95 ms
--- 14.215.177.39 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 5.954/6.133/6.313/0.195 ms
From the comparison, smartdns found the fastest IP address to visit www.baidu.com, so accessing Baidu's DNS is 5 times faster than Ali DNS.
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Multiple upstream DNS servers
Support configuring multiple upstream DNS servers and query at the same time.the query will not be affected, Even if there is a DNS server exception. -
Return the fastest IP address
Supports finding the fastest access IP address from the IP address list of the domain name and returning it to the client to avoid DNS pollution and improve network access speed. -
Support for multiple query protocols
Support UDP, TCP, TLS, HTTPS queries, and non-53 port queries, effectively avoiding DNS pollution. -
Domain IP address specification
Support configuring IP address of specific domain to achieve the effect of advertising filtering, and avoid malicious websites. -
Domain name high performance rule filtering
Support domain name suffix matching mode, simplify filtering configuration, filter 200,000 recording and take time <1ms. -
Linux/Windows multi-platform support
Support standard Linux system (Raspberry Pi), openwrt system various firmware, ASUS router native firmware. Support Windows 10 WSL (Windows Subsystem for Linux). -
Support IPV4, IPV6 dual stack
Support IPV4, IPV6 network, support query A, AAAA record, dual-stack IP selection, and disale IPV6 AAAA record. -
High performance, low resource consumption
Multi-threaded asynchronous IO mode, cache cache query results.
- SmartDNS receives DNS query requests from local network devices, such as PCs and mobile phone query requests.
- SmartDNS sends query requests to multiple upstream DNS servers, using standard UDP queries, non-standard port UDP queries, and TCP queries.
- The upstream DNS server returns a list of Server IP addresses corresponding to the domain name. SmartDNS detects the fastest Server IP with local network access.
- Return the fastest accessed Server IP to the local client.
smartdns can already be installed using system package management tools.
| System | Installation | Instructions |
|---|---|---|
| openwrt | opkg update opkg install luci-app-smartdns opkg install smartdns |
systems after 22.03. Software source: https://downloads.openwrt.org/releases/ |
| ddwrt | latest firmware. goto services page abd enable SmartDNS Resolver. | Demo: https://forum.dd-wrt.com/demo/Services.html |
| debian | apt-get install smartdns | |
| entware | ipkg update ipkg install smartdns |
Software source: https://bin.entware.net/ |
Download the matching version of the SmartDNS installation package. The corresponding installation package is as follows.
| system | package | Description |
|---|---|---|
| Standard Linux system (Raspberry Pi) | smartdns.xxxxxxxx.arm-debian-all.deb | Support Raspberry Pi Raspbian stretch, Debian 9 system. |
| Standard Linux system (Armbian arm64) | smartdns.xxxxxxxx.aarch64-debian-all.deb | Support Armbian debian stretch, Debian 9 system. |
| Standard Linux system (x86_64) | smartdns.xxxxxxxx.x86_64-linux-all.tar.gz | Support for x86_64 Linux systems. |
| Windows 10 WSL (ubuntu) | smartdns.xxxxxxxx.x86_64-linux-all.tar.gz | Windows 10 WSL ubuntu. |
| Standard Linux system (x86) | smartdns.xxxxxxxx.x86-linux-all.tar.gz | Support for x86_64 systems. |
| optware | smartdns.xxxxxxxx.mips-optware-all.ipk | Support the MIPS big-endian architecture for optware。 |
| optware | smartdns.xxxxxxxx.mipsel-optware-all.ipk | Support the MIPS little-endian architecture for optware。 |
| optware | smartdns.xxxxxxxx.arm-optware-all.ipk | Support the arm architecture for optware。 |
| openwrt | smartdns.xxxxxxxx.mips-openwrt-all.ipk | Support the MIPS big-endian architecture for openwrt。 |
| openwrt | smartdns.xxxxxxxx.mipsel-openwrt-all.ipk | Support the MIPS little-endian architecture for openwrt。 |
| openwrt | smartdns.xxxxxxxx.arm-openwrt-all.ipk | Support the arm architecture for openwrt。 |
| openwrt LUCI | luci-app-smartdns.xxxxxxxxx.all.ipk | Openwrt management interface. |
| openwrt LUCI | luci-app-smartdns.xxxxxxxxx.all-luci-compat-all | Compat Openwrt management interface for early openwrt. |
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The released packages are statically compiled. If you need a small size package, please compile it yourself or obtain it from the openwrt / entware repository.
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Please download from the Release page: Download here
https://github.com/pymumu/smartdns/releases- For the installation procedure, please refer to the following sections.
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Installation
Download the installation package like
smartdns.xxxxxxxx.arm-debian-all.deband upload it to the Linux system. Run the following command to installdpkg -i smartdns.xxxxxxxx.arm-debian-all.deb
For X86-64 system, download the installation package like
smartdns.xxxxxxxx.x86_64-linux-all.tar.gzand upload it to the Linux system. Run the following command to installtar zxf smartdns.xxxxxxxx.x86_64-linux-all.tar.gz cd smartdns chmod +x ./install ./install -i -
Configuration
After the installation is complete, you can configure the upstream server to smartdns. Refer to the
Configuration Parametersfor specific configuration parameters.
In general, you only need to addserver [IP]:port,server-tcp [IP]:portconfiguration items.
Configure as many upstream DNS servers as possible, including servers at home and abroad. Please refer to theConfiguration Parameterssection for configuration parameters.vi /etc/smartdns/smartdns.conf
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Start Service
systemctl enable smartdns systemctl start smartdns -
Forwarding DNS request to SmartDNS
Modify the DNS server of the local router and configure the DNS server as SmartDNS.
- Log in to the router on the local network and configure the Raspberry Pi to assign a static IP address.
- Modify the WAN port or DHCP DNS to the Raspberry Pi IP address. Note: I. Each router configuration method is different. Please search Baidu for related configuration methods. II. some routers may not support configuring custom DNS server. in this case, please modify the PC's, mobile phone's DNS server to the ip of Raspberry Pi.
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Check if the service is configured successfully
Query domain name with
nslookup -querytype=ptr smartdns
Check if thenameitem in the command result is displayed assmartdnsorhostname, such assmartdnspi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: smartdns name = smartdns.
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Installation
Upload the software to the /root directory of the router with winscp or other tool, and execute the following command to install it.
opkg install smartdns.xxxxxxxx.xxxx.ipk opkg install luci-app-smartdns.xxxxxxxx.xxxx.all.ipk
- Note: For versions before openwrt 19.07, please install
luci-app-smartdns.xxxxxxxxx.all-luci-compat-allpackage.
- Note: For versions before openwrt 19.07, please install
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Configuration
Log in to the openwrt management page and open
Services->SmartDNSto configure SmartDNS.- Add upstream DNS server configuration to
Upstream Servers. It is recommended to configure multiple DNS servers at home and abroad. - Specify the IP address of a specific domain name in
Domain Address, which can be used for ad blocking.
- Add upstream DNS server configuration to
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Start Service
There are two ways to use the SmartDNS service,
one is directly as the primary DNS service,the other is as the upstream of dnsmasq.
By default, SmartDNS uses the first method. You can choose according to your needs in the following two ways. -
Method 1: SmartDNS as primary DNS Server
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Enable SmartDNS as primary DNS Server
Log in to the router, click on
Services->SmartDNS->port, input port53, smartdns will run as primary DNS Server. -
Check if the service is configured successfully
Query domain name with
nslookup -querytype=ptr smartdnsSee if thenameitem in the command result is displayed assmartdnsorhostname, such assmartdnspi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: smartdns name = smartdns.
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Start Service
Check the `Enable' in the configuration page to start SmartDNS server.
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Note
- When the port of smartdns is 53, it will automatically take over dnsmasq as the primary dns. When configuring other ports, dnsmasq is re-enabled as primary dns.
- If an exception occurs during this process, you can use the following command to restore dnsmasq as the primary DNS
uci delete dhcp.@dnsmasq[0].port uci commit dhcp /etc/init.d/dnsmasq restart
Note: Merlin firmware is derived from ASUS firmware and can theoretically be used directly with the ASUS package. However, it is currently unverified. If you have any questions, please submit an issue.
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Prepare
When using this software, you need to confirm whether the router supports U disk and prepare a USB disk.
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Enable SSH login
Log in to the management interface, click
System Management-> ClickSystem Settingsand configureEnable SSHtoLan Only.
The SSH login username and password are the same as the management interface. -
Insstall
Download MasterIn the management interface, click
USB related application-> clickDownload Masterto download.
After the download is complete, enableDownload Master. If you do not need the download function, you can uninstallDownload Masterhere, but make sure that Download Master is enabled before uninstalling. -
Install SmartDNS
Upload the software to the router's
/tmp/mnt/sda1directory using winscp. (or copy the network neighborhood to the sda1 shared directory)ipkg install smartdns.xxxxxxx.mipsbig.ipk
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Restart router
After the router is started, use
nslookup -querytype=ptr smartdnsto query the domain name.
See if thenameitem in the command result is displayed assmartdnsorhostname, such assmartdnspi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: smartdns name = smartdns. -
Note
In the above process, smartdns will be installed to the root directory of the U disk and run in optware mode.
Its directory structure is as follows: (only smartdns related files are listed here)USB DISK └── asusware.mipsbig ├── bin ├── etc | ├── smartdns | | └── smartdns.conf | └── init.d | └── S50smartdns ├── lib ├── sbin ├── usr | └── sbin | └── smartdns ....To modify the configuration, you can use ssh to login to the router and use the vi command to modify it.
vi /opt/etc/smartdns/smartdns.conf
It can also be modified from Network Neighborhood. From the neighbor sharing directory
sda1you can't see theasusware.mipsbigdirectory, but you can directly enterasusware.mipsbig\etc\init.dinFile Managerto modify it.\\192.168.1.1\sda1\asusware.mipsbig\etc\init.d
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Prepare
When using this software, you need to confirm whether the router supports USB disk and prepare a USB disk.
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Install SmartDNS
Upload the software to
/tmpdirectory of the router using winscp, and run the flollowing command to install.ipkg install smartdns.xxxxxxx.mipsbig.ipk
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Modify the smartdns configuration
Vi /opt/etc/smartdns/smartdns.conf
Note: if you need to support IPV6, you can set the worke-mode to
2, this will disable the DNS service of dnsmasq, and smartdns run as the primary DNS server. ChangeSMARTDNS_WORKMODEin the file/opt/etc/smartdns/smartdns-opt.confto 2.SMARTDNS_WORKMODE="2" -
Restart the router to take effect
After the router is started, use
nslookup -querytype=ptr smartdnsto query the domain name. See if thenameitem in the command result is displayed assmartdnsorhostname, such assmartdnsPi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: smartdns name = smartdns.Note: If the service does not start automatically, you need to set optwre/entware to start automatically. For details, see the optware/entware documentation.
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Install Windows 10 WSL ubuntu
Install the Windows 10 WSL environment and select Ubuntu as default distribution. Please refer to WSL installation instructions for installation steps
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Install smartdns
download install package
smartdns.xxxxxxxx.x86_64-linux-all.tar.gz，and unzip to theD:\directory, after decompression, the directory is as follows:D:\SMARTDNS ├─etc │ ├─default │ ├─init.d │ └─smartdns ├─package │ └─windows ├─src └─systemdDouble-click
install.batin theD:\smartdns\package\windowsdirectory for installation. Please enter the password forWLS ubuntuwhen input password. -
Configuration
Edit
smartdns.confconfiguration file inD:\smartdns\etc\smartdnsdirectory, you can configure the upstream server to smartdns. Refer to theConfiguration Parametersfor specific configuration parameters.
In general, you only need to addserver [IP]:port,server-tcp [IP]:portconfiguration items.
Configure as many upstream DNS servers as possible, including servers at home and abroad. Please refer to theConfiguration Parameterssection for configuration parameters. -
Start Service
Double-click
reload.batin theD:\smartdns\package\windowsdirectory for reload. -
Forwarding DNS request to SmartDNS
Modify the default DNS server for Windows to
127.0.0.1, with these steps referred to IP configuration -
Check if the service is configured successfully
Query domain name with
nslookup -querytype=ptr smartdns
Check if thenameitem in the command result is displayed assmartdnsorhostname, such assmartdnspi@raspberrypi:~/code/smartdns_build $ nslookup -querytype=ptr smartdns Server: 192.168.1.1 Address: 192.168.1.1#53 Non-authoritative answer: smartdns name = smartdns.
| parameter | Parameter function | Default value | Value type | Example |
|---|---|---|---|---|
| server-name | DNS name | host name/smartdns | any string like hosname | server-name smartdns |
| bind | DNS listening port number | [::]:53 | Support binding multiple portsIP:PORT: server IP, port number. [-group]: The DNS server group used when requesting. [-no-rule-addr]: Skip the address rule. [-no-rule-nameserver]: Skip the Nameserver rule. [-no-rule-ipset]: Skip the Ipset or nftset rules. [-no-rule-soa]: Skip address SOA(#) rules.[-no-dualstack-selection]: Disable dualstack ip selection.[-no-speed-check]: Disable speed measurement. [-no-cache]: stop caching |
bind :53 |
| bind-tcp | TCP mode DNS listening port number | [::]:53 | Support binding multiple portsIP:PORT: server IP, port number. [-group]: The DNS server group used when requesting. [-no-rule-addr]: Skip the address rule. [-no-rule-nameserver]: Skip the Nameserver rule. [-no-rule-ipset]: Skip the Ipset or nftset rules. [-no-rule-soa]: Skip address SOA(#) rules.[-no-dualstack-selection]: Disable dualstack ip selection.[-no-speed-check]: Disable speed measurement. [-no-cache]: stop caching |
bind-tcp :53 |
| cache-size | Domain name result cache number | 512 | integer | cache-size 512 |
| cache-persist | enable persist cache | Auto: Enabled if the location of cache-file has more than 128MB of free space. |
[yes|no] | cache-persist yes |
| cache-file | cache persist file | /tmp/smartdns.cache | 路径 | cache-file /tmp/smartdns.cache |
| tcp-idle-time | TCP connection idle timeout | 120 | integer | tcp-idle-time 120 |
| rr-ttl | Domain name TTL | Remote query result | number greater than 0 | rr-ttl 600 |
| rr-ttl-min | Domain name Minimum TTL | Remote query result | number greater than 0 | rr-ttl-min 60 |
| local-ttl | ttl for address and host | rr-ttl-min | number greater than 0 | local-ttl 600 |
| rr-ttl-reply-max | Domain name Minimum Reply TTL | Remote query result | number greater than 0 | rr-ttl-reply-max 60 |
| rr-ttl-max | Domain name Maximum TTL | Remote query result | number greater than 0 | rr-ttl-max 600 |
| max-reply-ip-num | Maximum number of IPs returned to the client | 8 | number of IPs, 1~16 | max-reply-ip-num 1 |
| log-level | log level | error | fatal,error,warn,notice,info,debug | log-level error |
| log-file | log path | /var/log/smartdns/smartdns.log | File Pah | log-file /var/log/smartdns/smartdns.log |
| log-size | log size | 128K | number+K,M,G | log-size 128K |
| log-num | archived log number | 2 | Integer | log-num 2 |
| audit-enable | audit log enable | no | [yes|no] | audit-enable yes |
| audit-file | audit log file | /var/log/smartdns/smartdns-audit.log | File Path | audit-file /var/log/smartdns/smartdns-audit.log |
| audit-size | audit log size | 128K | number+K,M,G | audit-size 128K |
| audit-num | archived audit log number | 2 | Integer | audit-num 2 |
| conf-file | additional conf file | None | File path | conf-file /etc/smartdns/smartdns.more.conf |
| server | Upstream UDP DNS server | None | Repeatable [ip][:port]: Server IP, port optional. [-blacklist-ip]: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". [-whitelist-ip]: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. [-group [group] ...]: The group to which the DNS server belongs, such as office, foreign, use with nameserver. [-exclude-default-group]: Exclude DNS servers from the default group |
server 8.8.8.8:53 -blacklist-ip |
| server-tcp | Upstream TCP DNS server | None | Repeatable [ip][:port]: Server IP, port optional. [-blacklist-ip]: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". [-whitelist-ip]: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. [-group [group] ...]: The group to which the DNS server belongs, such as office, foreign, use with nameserver. [-exclude-default-group]: Exclude DNS servers from the default group |
server-tcp 8.8.8.8:53 |
| server-tls | Upstream TLS DNS server | None | Repeatable [ip][:port]: Server IP, port optional. [-spki-pin [sha256-pin]]: TLS verify SPKI value, a base64 encoded SHA256 hash[-host-name]:TLS Server name. [-tls-host-verify]: TLS cert hostname to verify. -no-check-certificate:: No check certificate. [-blacklist-ip]: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". [-whitelist-ip]: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. [-group [group] ...]: The group to which the DNS server belongs, such as office, foreign, use with nameserver. [-exclude-default-group]: Exclude DNS servers from the default group |
server-tls 8.8.8.8:853 |
| server-https | Upstream HTTPS DNS server | None | Repeatable https://[host][:port]/path: Server IP, port optional. [-spki-pin [sha256-pin]]: TLS verify SPKI value, a base64 encoded SHA256 hash[-host-name]:TLS Server name[-http-host]：http header host. [-tls-host-verify]: TLS cert hostname to verify. -no-check-certificate:: No check certificate. [-blacklist-ip]: The "-blacklist-ip" parameter is to filtering IPs which is configured by "blacklist-ip". [-whitelist-ip]: whitelist-ip parameter specifies that only the IP range configured in whitelist-ip is accepted. [-group [group] ...]: The group to which the DNS server belongs, such as office, foreign, use with nameserver. [-exclude-default-group]: Exclude DNS servers from the default group |
server-https https://cloudflare-dns.com/dns-query |
| speed-check-mode | Speed mode | None | [ping|tcp:[80]|none] | speed-check-mode ping,tcp:80,tcp:443 |
| response-mode | First query response mode | first-ping | Mode: [fisrt-ping|fastest-ip|fastest-response] [first-ping]: The fastest dns + ping response mode, DNS query delay + ping delay is the shortest; [fastest-ip]: The fastest IP address mode, return the fastest ip address, may take some time to test speed. [fastest-response]: The fastest response DNS result mode, the DNS query waiting time is the shortest. |
response-mode first-ping |
| address | Domain IP address | None | address /domain/[ip|-|-4|-6|#|#4|#6], - for ignore, # for return SOA, 4 for IPV4, 6 for IPV6 |
address /www.example.com/1.2.3.4 |
| nameserver | To query domain with specific server group | None | nameserver /domain/[group|-], group is the group name, - means ignore this rule, use the -group parameter in the related server |
nameserver /www.example.com/office |
| ipset | Domain IPSet | None | ipset /domain/[ipset|-|#[4|6]:[ipset|-][,#[4|6]:[ipset|-]]], - for ignore |
ipset /www.example.com/#4:dns4,#6:- |
| ipset-timeout | ipset timeout enable | auto | [yes] | ipset-timeout yes |
| nftset | Domain nftset | None | nftset /domain/#[4|6]:[family#nftable#nftset|-][,#[4|6]:[family#nftable#nftset|-]]], - to ignore; the valid families are inet and ip for ipv4 addresses while the valid ones are inet and ip6 for ipv6 addresses; due to the limitation of nft, two types of addresses have to be stored in two sets |
nftset /www.example.com/#4:inet#mytab#dns4,#6:- |
| nftset-timeout | nftset timeout enable | auto | [yes] | nftset-timeout yes |
| domain-rules | set domain rules | None | domain-rules /domain/ [-rules...][-c|-speed-check-mode]: set speed check mode，same as parameter speed-check-mode[-a|-address]: same as parameter address [-n|-nameserver]: same as parameter nameserver[-p|-ipset]: same as parameter nftset[-s|-nftset]: same as parameter nftset[-d|-dualstack-ip-selection]: same as parameter dualstack-ip-selection |
domain-rules /www.example.com/ -speed-check-mode none |
| domain-set | collection of domains | None | domain-set [options...] [-n|-name]：name of set [-t|-type] [list]: set type, only support list, one domain per line [-f|-file]：file path of domain set used with address, nameserver, ipset, nftset, example: /domain-set:[name]/ |
domain-set -name set -type list -file /path/to/list address /domain-set:set/1.2.4.8 |
| bogus-nxdomain | bogus IP address | None | [IP/subnet], Repeatable | bogus-nxdomain 1.2.3.4/16 |
| ignore-ip | ignore ip address | None | [ip/subnet], Repeatable | ignore-ip 1.2.3.4/16 |
| whitelist-ip | ip whitelist | None | [ip/subnet], Repeatable，When the filtering server responds IPs in the IP whitelist, only result in whitelist will be accepted | whitelist-ip 1.2.3.4/16 |
| blacklist-ip | ip blacklist | None | [ip/subnet], Repeatable，When the filtering server responds IPs in the IP blacklist, The result will be discarded directly | blacklist-ip 1.2.3.4/16 |
| force-AAAA-SOA | force AAAA query return SOA | no | [yes|no] | force-AAAA-SOA yes |
| force-qtype-SOA | force specific qtype return SOA | qtype id | [qtypeid | ...] |
| prefetch-domain | domain prefetch feature | no | [yes|no] | prefetch-domain yes |
| dnsmasq-lease-file | Support reading dnsmasq dhcp file to resolve local hostname | None | dnsmasq dhcp lease file | dnsmasq-lease-file /var/lib/misc/dnsmasq.leases |
| serve-expired | Cache serve expired feature | yes | [yes|no], Attempts to serve old responses from cache with a TTL of 0 in the response without waiting for the actual resolution to finish. | serve-expired yes |
| serve-expired-ttl | Cache serve expired limite TTL | 0 | second，0：disable，> 0 seconds after expiration | serve-expired-ttl 0 |
| serve-expired-reply-ttl | TTL value to use when replying with expired data | 5 | second，0：disable，> 0 seconds after expiration | serve-expired-reply-ttl 30 |
| dualstack-ip-selection | Dualstack ip selection | yes | [yes|no] | dualstack-ip-selection yes |
| dualstack-ip-selection-threshold | Dualstack ip select threadhold | 15ms | millisecond | dualstack-ip-selection-threshold [0-1000] |
| user | run as user | root | user [username] | user nobody |
| ca-file | certificate file | /etc/ssl/certs/ca-certificates.crt | path | ca-file /etc/ssl/certs/ca-certificates.crt |
| ca-path | certificates path | /etc/ssl/certs | path | ca-path /etc/ssl/certs |
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What is the difference between SmartDNS and DNSMASQ?
Smartdns is not designed to replace DNSMASQ. The main function of Smartdns is focused on DNS resolution enhancement, the difference are:- Multiple upstream server concurrent requests, after the results are measured, return the best results;
address,ipsetdomain name matching uses efficient algorithms, query matching is faster and more efficient, and router devices are still efficient.- Domain name matching supports ignoring specific domain names, and can be individually matched to IPv4, IPV6, and supports diversified customization.
- Enhance the ad blocking feature, return SOA record, this block ads better;
- IPV4, IPV6 dual stack IP optimization mechanism, in the case of dual network, choose the fastest network.
- Supports the latest TLS, HTTPS protocol and provides secure DNS query capabilities.
- DNS anti-poison mechanism, and a variety of mechanisms to avoid DNS pollution.
- ECS support, the query results are better and more accurate.
- IP blacklist support, ignoring the blacklist IP to make domain name queries better and more accurate.
- Domain name pre-fetch, more faster to access popular websites.
- Domain name TTL can be specified to make access faster.
- Cache mechanism to make access faster.
- Asynchronous log, audit log mechanism, does not affect DNS query performance while recording information.
- Domain group mechanism, specific domain names use specific upstream server group queries to avoid privacy leakage.
- The second DNS supports customizing more behavior.
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What is the best practices for upstream server configuration?
Smartdns has a speed measurement mechanism. When configuring an upstream server, it is recommended to configure multiple upstream DNS servers, including servers in different regions, but the total number is recommended to be around 10. Recommended configuration- Carrier DNS.
- Public DNS, such as
8.8.8.8,8.8.4.4,1.1.1.1.
For specific domain names, if there is a pollution, you can enable the anti-pollution mechanism.
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How to enable the audit log
The audit log records the domain name requested by the client. The record information includes the request time, the request IP address, the request domain name, and the request type. If you want to enable the audit log, configureaudit-enable yesin the configuration file,audit-size,Audit-file,audit-numconfigure the audit log file size, the audit log file path, and the number of audit log files. The audit log file will be compressed to save space. -
How to avoid DNS privacy leaks
By default, smartdns will send requests to all configured DNS servers. If the upstream DNS servers record DNS logs, it will result in a DNS privacy leak. To avoid privacy leaks, try the following steps:- Use trusted DNS servers.
- Use TLS servers.
- Set up an upstream DNS server group.
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How to block ads
Smartdns has a high-performance domain name matching algorithm. It is very efficient to filter advertisements by domain name. To block ads, you only need to configure records like the following configure. For example, if you block*.ad.com, configure as follows:Address /ad.com/#The suffix mode of the domain name, filtering *.ad.com,
#means returning SOA record. If you want to only block IPV4 or IPV6 separately, add a number after#, such as#4is for IPV4 blocking. If you want to ignore some specific subdomains, you can configure it as follows. e.g., if you ignorepass.ad.com, you can configure it as follows:Address /pass.ad.com/-
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DNS query diversion
In some cases, some domain names need to be queried using a specific DNS server to do DNS diversion. such as..home -> 192.168.1.1 .office -> 10.0.0.1
The domain name ending in .home is sent to 192.168.1.1 for resolving The domain name ending in .office is sent to 10.0.0.1 for resolving Other domain names are resolved using the default mode. The diversion configuration for this case is as follows:
# Upstream configuration, use -group to specify the group name, and -exclude-default-group to exclude the server from the default group. Server 192.168.1.1 -group home -exclude-default-group Server 10.0.0.1 -group office -exclude-default-group Server 8.8.8.8 #Configure the resolved domain name with specific group Nameserver /.home/home Nameserver /.office/office
You can use the above configuration to implement DNS resolution and offload. If you need to implement traffic distribution on the requesting port, you can configure the second DNS server. The bind configuration is added. The group parameter specifies the traffic distribution name.
Bind :7053 -group office Bind :8053 -group home
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How to use the IPV4, IPV6 dual stack IP optimization feature
At present, IPV6 network is not as fast as IPV4 in some cases. In order to get a better experience in the dual-stack network, SmartDNS provides a dual-stack IP optimization mechanism, the same domain name, and the speed of IPV4. Far faster than IPV6, then SmartDNS will block the resolution of IPV6, let the PC use IPV4, the feature is enabled bydualstack-ip-selection yes,dualstack-ip-selection-threshold [time]is for threshold. if you want to disable IPV6 AAAA record complete, please tryforce-AAAA-SOA yes. -
How to improve cache performace
Smartdns provides a domain name caching mechanism to cache the queried domain name, and the caching time is in accordance with the DNS TTL specification. To increase the cache hit rate, the following configuration can be taken:-
Increase the number of cache records appropriately
Set the number of cache records bycache-size. In the case of a query with a high pressure environment and a machine with a large memory, it can be appropriately adjusted. -
Set the minimum TTL value as appropriate
Set the minimum DNS TTL time to a appropriate value byrr-ttl-minto extend the cache time. It is recommended that the timeout period be set to 10 to 30 minutes to avoid then invalid domain names when domain ip changes. -
Enable domain pre-acquisition
Enable pre-fetching of domain names withprefetch-domain yesto improve query hit rate. by default, Smartdns will send domain query request again before cache expire, and cache the result for the next query. Frequently accessed domain names will continue to be cached. This feature will consume more CPU when idle. -
Cache serve expired feature
Enable cache serve expired feature withserve-expired yesto improve the cache hit rate and reduce the CPU consumption. This feature will return TTL = 0 to the client after the TTL timeout, and send a new query request again at the same time, and cache the new results for later query.
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How does the second DNS customize more behavior?
The second DNS can be used as the upstream of other DNS servers to provide more query behaviors. Bind configuration support can bind multiple ports. Different ports can be set with different flags to implement different functions, such as# Binding 6053 port, request for port 6053 will be configured with the upstream query of the office group, and the result will not be measured. The address configuration address is ignored. bind [::]:6053 -no-speed-check -group office -no-rule-addr
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How to get SPKI of DOT
The SPKI can be obtained from the page published by the DNS service provider. If it is not published, it can be obtained by the following command, replace IP with your own IP.echo | openssl s_client -connect '1.0.0.1:853' 2>/dev/null | openssl x509 -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | openssl enc -base64
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How to solve the problem of slow DNS resolution in iOS system?
Since iOS14, Apple has supported the resolution of DNS HTTPS (TYPE65) records. This function is used for solving problems related to HTTPS connections, but it is still a draft, and it will cause some functions such as adblocking fail. It is recommended to disable it through the following configuration.force-qtype-SOA 65
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How to resolve localhost ip by hostname?
smartdns can cooperate with the dhcp server of DNSMASQ to support the resolution of local host name to IP address. You can configure smartdns to read the lease file of dnsmasq and support the resolution. The specific configuration parameters are as follows, (note that the DNSMASQ lease file may be different for each system and needs to be configured according to the actual situation)dnsmasq-lease-file /var/lib/misc/dnsmasq.leases
After the configuration is complete, you can directly use the host name to connect to the local machine. But need to pay attention:
- Windows system uses mDNS to resolve addresses by default. If you need to use smartdns to resolve addresses under Windows, you need to add
.after the host name, indicating that DNS resolution is used. Such asping smartdns.
- Windows system uses mDNS to resolve addresses by default. If you need to use smartdns to resolve addresses under Windows, you need to add
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How to use the domain set?
To facilitate configuring domain names by set, for configurations with /domain/, you can specify a domain name set for easy maintenance. The specific method is:- Use
domain-setconfiguration domain set file:
domain-set -name ad -file /etc/smartdns/ad-list.conf
The format of ad-list.conf is one domain per line:
ad.com site.com- To use the domain set, you only need to configure
/domain/to/domain-set:[collection name]/, such as:
address /domain-set:ad/# domain-rules /domain-set:ad/ -a # nameserver /domain-set:ad/server ...
- Use
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More questions
More questions, please read issue: https://github.com/pymumu/smartdns/issues
smartdns contains scripts for compiling packages, supports compiling luci, debian, openwrt, opare installation packages, and can execute package/build-pkg.sh compilation.
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Smartdns is licensed to the public under the GPL V3 License.