When trying to connect to an IPv6 VPN server using WireGuard protocol, the VPN won't work with the default firewall (firewalld) on Fedora Workstation. Removing firewalld (sudo dnf remove firewalld) resolves the issue. Reproducible: Always Steps to Reproduce: 1. Make sure you have native IPv6 on your Fedora workstation 2. Try to connect to a WireGuard server over IPv6 Actual Results: No connection over WireGuard Expected Results: Connection over WireGuard
By the way: connecting over IPv4 works just fine, e.g. by setting the IPv4 address of the server's hostname in `/etc/hosts` explicitly.
Workaround is to disable IPv6 rpfilter via firewalld.conf, i.e. set IPv6_rpfilter=no in /etc/firewalld/firewalld.conf. See upstream bug: https://github.com/firewalld/firewalld/issues/1203
Ah, thanks for the suggestion and upstream link! :)
After some quick testing, it seems that setting it to "loose" which will be the default in Fedora >42 also works! https://fedoraproject.org/wiki/Releases/42/ChangeSet#Firewalld_IPv6_rpfilter_default_to_loose_on_Workstations (I don't have a GitHub account, so can't comment on the upstream firewalld issue tracker).
This message is a reminder that Fedora Linux 40 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora Linux 40 on 2025-05-13. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a 'version' of '40'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, change the 'version' to a later Fedora Linux version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see it. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora Linux 40 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora Linux, you are encouraged to change the 'version' to a later version prior to this bug being closed.
Fedora Linux 40 entered end-of-life (EOL) status on 2025-05-13. Fedora Linux 40 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora Linux please feel free to reopen this bug against that version. Note that the version field may be hidden. Click the "Show advanced fields" button if you do not see the version field. If you are unable to reopen this bug, please file a new report against an active release. Thank you for reporting this bug and we are sorry it could not be fixed.
This is still a problem on F42. Reopening.
Looks like my custom /etc/firewalld/firewalld.conf file retained IPv6_rpfilter=strict. Setting this to IPv6_rpfilter=loose indeed made Wireguard work. Closing again. Sorry about the noise. PS. This is all documented behaviour: https://fedoraproject.org/wiki/Changes/Firewalld_IPv6_rpfilter_Default_Loose#Detailed_Description