How to specify the name of protocol when sending packets using moongen? #304
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Hi,
The packetgen.lua script does not allow for specifying the Layer 4 to Layer
7 protocols in the packet.
It was designed / created as a simple utility to generate bursts of UDP
traffic, with the focus being on the number of streams / flows, size of the
bursts, etc.
You can specify the source and destination UDP port and the UDP header
length, but that is the limit of fields that can be modified for Layer 4 of
the packets. Layer 5-7 are not populated.
If you need more control of the packet / header contents, you can either
use another sample script bundled with MoonGen, or modify the packetgen.lua
script to suit your needs.
- Philip
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…On Mon, Mar 29, 2021 at 1:28 PM Meysouli ***@***.***> wrote:
in fact i'm trying to runn moongen with the lua scripts that are already
found within the package,i'm using " ./build/MoonGen ./packetgen.lua -tx 0
-rx 1" to send traffic but the problem is that i cannot find the way to
specify the stream profile like https or something like that
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Thank you for the answer , for the bundled scripts are you referring to the ones in MoonGen/libmoon/lua ? |
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I'm afraid I don't know much about the other sample scripts bundled with
MoonGen in the examples directory. Maybe one of the other scripts can
provide the packets you require.
Maybe someone else more familiar with the example scripts can provide some
feedback / help in this regard ?
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…On Mon, Mar 29, 2021 at 2:58 PM Meysouli ***@***.***> wrote:
Thank you for the answer , for the bundled scripts are you referring to
the ones in MoonGen/libmoon/lua ?
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Thank you :) |
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Hello again , is there a way i can sniff the packet generated from this command |
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Hi,
Unfortunately not using the packetgen.lua script in its current state.
It was designed to give the best possible performance for the parameter
set, and dumping packet contents would slow the script and traffic
generation / receipt down too much.
The script does allow for logging TX and RX statistics like bytes, number
of packets, rates, etc., but not the packet contents themselves. The
statistics can even be written to a file, either globally or to a per-core
file.
In order to dump the packet contents / "sniff" the packets, you would need
to modify the packetgen.lua script to dump the packets to suit your needs,
or use another example moongen script to generate and receive / sniff the
packets.
- Philip
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…On Tue, Apr 6, 2021 at 2:24 PM Meysouli ***@***.***> wrote:
Hello again , is there a way i can sniff the packet generated from this
command
" sudo ./build/MoonGen ./examples/netronome-packetgen/packetgen.lua -tx 0
-rx 1" ??
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Thank you for being such great help |
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I tried using tcpdump to sniff the traffic from the command above and saved it into pcap file then read it with wireshark but no help there , |
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Hi,
I'm afraid I'm not familiar enough with the interaction between DPDK and
the kernel to know whether tcpdump would be able to capture packets on a
DPDK interface, perhaps someone more familiar with this interaction can
help you with that.
The packetgen.lua script does not care about links between the tx and rx
slaeports. This is because the tx and rx sale ports can be on different
machines (if you run separate packetgenlua instances on the different
machines, or on the same machine, if you have both tx and rx slaves on the
command line.
This gives you the freedom to generate a lot more packets on multiple ports
on one system and receive them on multiple ports on a different system for
potentially performance benefits.
The ports are assigned rx and tx slave functions based on on the command
line arguments given, plus the ports detected my MoonGen's detection and
configuration systems, along with DPDK methods.
For example, as in your case where you have a tx slave and a rx slave on
port 0 and 1, the first detected interface will be used as port 0, and the
second will be port 1. For example, if you have -tx 0 -rx 1 on your command
line, this means port 0 will be used for tx, and port 1 will be used for rx.
Once they are configured and bound by DPDK, DPDK is in control of the
interfaces, and as such, you don't need to configure any special links
between the tx and rx ports. (with normal kernel interfaces and the linux
routing tables, you might need to configure network namespaces, etc., but
not for DPDK)
- Philip
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…On Tue, Apr 6, 2021 at 3:36 PM Meysouli ***@***.***> wrote:
I tried using tcpdump to sniff the traffic from the command above and
saved it into pcap file then read it with wireshark but no help there ,
Also do i have to specify link between port 0 and 1 ? (( i'm using the
same physical machine))
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No, you can't use the normal system tcpdump on a DPDK-related thing :( |
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in fact i'm trying to runn moongen with the lua scripts that are already found within the package,i'm using " ./build/MoonGen ./packetgen.lua -tx 0 -rx 1" to send traffic but the problem is that i cannot find the way to specify the stream profile like https or something like that
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