Is sshd not accessible at all over ipv4? How did you notice that sshd
was not listening on ipv4?
In the default case, we should end up with ssh.socket listening on
[::]:22, but with IPV6_V6ONLY=0 so that sshd is still accessible over
ipv4.
> Setting net.ipv6.bindv6only=0 also helps, but that's not a solution.
I think this is the default on Ubuntu, no?
If your system does have net.ipv6.bindv6only=1, and you don't want to
change it, a workaround for now should be to do:
$ mkdir -p /etc/systemd/systemd/ssh.socket.d/
$ cat > /etc/systemd/system/ssh.socket.d/bindipv6only-both.conf << EOF
[Socket]
BindIPv6Only=both
EOF
which has the effect of setting IPV6_V6ONLY to 0 for this particular
socket.
We should probably fix sshd-socket-generator to automatically do this in
certain cases.
** Changed in: openssh (Ubuntu)
Importance: Undecided => Medium
** Changed in: openssh (Ubuntu)
Status: New => Incomplete
** Changed in: openssh (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: rls-nn-incoming
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https://bugs.launchpad.net/bugs/2080216
Title:
sshd cannot bind to IPv4 interfaces
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