This is needed for Tor relays running on firewall machines with limited outgoing connections. Iptables should allow any outgoing traffic coming from the Tor user.
https://lists.ipfire.org/pipermail/development/2018-June/004544.html
https://patchwork.ipfire.org/project/ipfire/list/?series=603
https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=5fc5f703470b37b43e18be66da0fb181696428a7 https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=4680d554fc52813b9e2a1bae3888d0b34dfbb5ad
https://blog.ipfire.org/post/ipfire-2-23-core-update-131-is-available-for-testing
https://blog.ipfire.org/post/ipfire-2-23-core-update-131-released