Bind to particular IP

[Daniel15]

Nice project!

Is there a way to bind to a particular IP address? My server has several IPv6 addresses, one of which has a reverse DNS entry I've specifically configured for IRC. I'd like to only use that IP for outbound connections. Is that possible? Other bouncers provide this functionality.

[antifuchs]

I've found a way to do this without implementing extra features in heisenbridge, at the cost of running an extra service:

1. Set up the dante socks5 proxy to run on the same machine as heisenbridge; I used this configuration for sockd, to ensure outgoing connections go through the external address:

user.privileged: root
user.unprivileged: dante
logoutput: syslog

internal: ::1 port = 1080
external: f00d:cafe:beef::69 # the external-facing IP
socksmethod: none
compatibility: sameport

#accept connections from any IPv6 client
client pass {
        from: ::/0 to: ::/0
        log: error connect disconnect
}
socks pass {
        from: ::/0 to: ::/0
        command: bind connect udpassociate
        log: error # connect disconnect
}

2. Configure servers in heisenbridge for the networks you want to use with the --proxy socks5://[::1]:1080 argument, which instructs it to use dante as the socks proxy.

This configuration somehow causes heisenbridge's built-in identd implementation to be unable to identify users, so I use the "null identd" mod that nixos ships, but you can run oidentd or anything else, just as well.

Hope that helps!