Hi list! I have an issue with SSH. It's a variation of the old "Set 'UseDNS no' to avoid delays with faulty DNS records" theme.
Following setup: 1. I have a server with IPv6 compiled into the SSH daemon but no actual IPv6 network interface. 2. The SSH client has no IPv6, neither compiled nor active. 3. The DNS server doesn't serve or support AAAA records. Apparently it drops all such requests. All other records for IP and reverse lookup are correct. Now I'm experiencing the classic, very long delay when connecting to the server via SSH because it does DNS lookups. When I look at wireshark dumps, I see correctly served A and reverse lookups but the server also insists on doing AAAA requests which time out. I tried limiting the sshd "AddressFamily" to inet (aka IPv4) but this didn't change anything. Is there another workaround or do I really have to deactivate DNS lookups? Thanks in advance! Florian Philipp
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