I am seeing very strange behavior with servers running CentOS 6.4 x64.
If I run a ping on a host which clearly doesn't exist:
➜ ~ ping sdafsadfdsadfsasdfasdoi.com PING sdafsadfdsadfsasdfasdoi.com.mydomain.com (X.X.X.X) 56(84) bytes of data. 64 bytes from web2.mydomain.com (X.X.X.X): icmp_seq=1 ttl=64 time=0.047 ms
Notice that is simply added mydomain.com to the end, and since I have a wildcard DNS entry *.mydomain.com it resolved. This is not the desired behavior. I expect this to return unknown host.
If I run
➜ ~ nslookup sdafsadfdsadfsasdfasdoi.com Server: 126.96.36.199 Address: 188.8.131.52#53 ** server can't find sdafsadfdsadfsasdfasdoi.com: NXDOMAIN
Ok, so nslookup returns what I expect.
Any idea why this is happening, and how to prevent it, and return unknown host from a ping?
/etc/resolv.conf fixed the issue. This feel like a dirty hack though. Is there a more elegant and best practices solution?