Okay, I am not sure why the ipv6 socket is not accepting ipv4, because AFAICT (and when I test on my machine) the way IPV6_V6ONLY is being set in the default case, it should allow ipv4.
However, I do think there is a case to be made about the socket unit being more aligned with the contents of /etc/ssh/sshd_config, and non- socket activated sshd. E.g., with the default contents of /etc/ssh/sshd_config, and *non-socket-activated* ssh, we will have two separate listening addresses, [::]:22 and 0.0.0.0:22 (explicitly, not via ipv6). We should do the same for socket-activated SSH by default. And, while we are at it, we need to make sshd-socket-generator honor AddressFamily. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/2080216 Title: sshd cannot bind to IPv4 interfaces Status in openssh package in Ubuntu: Confirmed Bug description: After upgrading from 22.04 to 24.04 I noticed that my sshd only listening on IPv6 interface (::), while previously it was listening both IPv4 (0.0.0.0) and IPv6 (::). I tried to explicitly specify ListenAddress 0.0.0.0 (assuming it would bind to IPv4 only) but after restart sshd was still listening on IPv6 only. This problem affects other packages as well, for example, openvpn. Rebuilding applications from sources seems to fix the issue. Setting net.ipv6.bindv6only=0 also helps, but that's not a solution. ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: openssh-server 1:9.6p1-3ubuntu13.5 ProcVersionSignature: Ubuntu 6.8.0-41.41-generic 6.8.12 Uname: Linux 6.8.0-41-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.1 Architecture: amd64 CasperMD5CheckResult: unknown Date: Tue Sep 10 16:45:54 2024 ProcEnviron: LANG=C.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=screen.xterm-256color SourcePackage: openssh UpgradeStatus: Upgraded to noble on 2024-09-10 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/2080216/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
