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doc/per-user-ip: new documentation article

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Simon Ser 2021-11-17 18:04:14 +01:00
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# Setting up per-user IP addresses
If your bouncer hosts many users, you may want to assign a unique IP address for
each user. This allows upstream networks to easily ban a single user when a
misbehavior is detected, instead of banning the whole bouncer.
Assuming you're running Linux and want to use the IPv6 prefix `2001:db8::/32`:
1. Setup the router to redirect ingress packets with one of these IP addresses
as the destination to your bouncer.
2. Enable `net.ipv6.ip_nonlocal_bind=1` with `sysctl`.
3. Setup a local route for this prefix:
`ip route add local 2001:db8::/56 dev lo`
4. Check network connectivity:
`curl -6 --interface 2001:db8::42 https://emersion.fr`
5. Configure soju to use this IP range: `upstream-user-ip 2001:db8::/32`
The address `2001:db8::1` will be left unused. Users will be assigned IP
addresses starting from `2001:db8::2`.
The IRC `/whois` command can be used to double-check that the expected IPv6
addresses are being used.