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DNS over socsk5 quick question
sidewinder
Member
in Help
so i am setting up a tunnel like this: on host machine to forward to xxx.xxx.xx.xxx
/usr/bin/ssh -fN -D localhost:8005 xxx.xxx.xx.xxx
on some servers, it doesn't resolve DNS queries when forwarding (usually from Racknerd)
is there some setting on Linux or Ubuntu that would kill DNS queries when setting up a tunnel like this? DNS works fine when the server:
ping google.com
64 bytes from xxt (172.253.124.102): icmp_seq=1 ttl=108 time=1.40 ms
64 bytes from xxt (172.253.124.102): icmp_seq=2 ttl=108 time=1.55 ms
64 bytes from xxt (172.253.124.102): icmp_seq=3 ttl=108 time=1.57 ms
64 bytes from xxt (172.253.124.102): icmp_seq=4 ttl=108 time=1.56 ms
64 bytes from xxt (172.253.124.102): icmp_seq=5 ttl=108 time=1.58 ms
Comments
why would you troubleshoot it using ping (which means ICMP) instead of actually making a dns request? (use dig or something). DNS works on port 53/udp.
try running tcpdump on both sides to see where the dns traffic went wrong. You'll be able to see if it timed out, if the dns traffic wasn't sent over socks5 at all, or if there are some tcp_reset shenanigans happening