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
ip route add local 2001:db8::/56 dev lo
curl -6 --interface 2001:db8::42 https://emersion.fr
2001:db8::1 will be left unused. Users will be assigned IP
addresses starting from
/whois command can be used to double-check that the expected IPv6
addresses are being used.