IPv6 nameservers

[reinerh]

Hi,

this is not a bug report, just some information about an issue Aidan Gauland reported on the Debian bugtracker.
He was using a firejail sandbox with --net=eth0 and was losing internet connectivity inside the sandbox (but not outside).
We figured out hostname resolution suddenly stopped working. He is using rdnssd on the host, which is a tool that autodiscovers IPv6 nameservers. This was overwriting the resolv.conf with a nameserver detected on the local network.
The content looked like this: nameserver fe80::c6e9:84ff:1234:abcd%eth0
But as there was no eth0 interface inside the sandbox (instead there is a eth0-nnnnn interface), the nameserver was no longer reachable.

He also suggests to document this behavior on the known issues page.

[netblue30]

Thanks, I'll look into it.

[matu3ba]

@reinerh @netblue30 Is this still relevant/reproducable or can this be closed?

[reinerh]

I would say that's still relevant.