Name: Anonymous 2013-03-21 14:31
WTF is happening there? Why first ping failed, but ping right after nslookup succeeded?
$ ping en.wikipedia.org
ping: cannot resolve en.wikipedia.org: Unknown host
$ nslookup en.wikipedia.org
Server: 192.168.0.1
Address: 192.168.0.1#53
Non-authoritative answer:
en.wikipedia.org canonical name = wikipedia-lb.wikimedia.org.
wikipedia-lb.wikimedia.org canonical name = wikipedia-lb.esams.wikimedia.org.
Name: wikipedia-lb.esams.wikimedia.org
Address: 91.198.174.225
$ ping en.wikipedia.org
PING wikipedia-lb.esams.wikimedia.org (91.198.174.225): 56 data bytes
64 bytes from 91.198.174.225: icmp_seq=0 ttl=56 time=73.034 ms
64 bytes from 91.198.174.225: icmp_seq=1 ttl=56 time=75.222 ms
^C
--- wikipedia-lb.esams.wikimedia.org ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 73.034/74.128/75.222/1.094 ms
$ ping en.wikipedia.org
ping: cannot resolve en.wikipedia.org: Unknown host
$ nslookup en.wikipedia.org
Server: 192.168.0.1
Address: 192.168.0.1#53
Non-authoritative answer:
en.wikipedia.org canonical name = wikipedia-lb.wikimedia.org.
wikipedia-lb.wikimedia.org canonical name = wikipedia-lb.esams.wikimedia.org.
Name: wikipedia-lb.esams.wikimedia.org
Address: 91.198.174.225
$ ping en.wikipedia.org
PING wikipedia-lb.esams.wikimedia.org (91.198.174.225): 56 data bytes
64 bytes from 91.198.174.225: icmp_seq=0 ttl=56 time=73.034 ms
64 bytes from 91.198.174.225: icmp_seq=1 ttl=56 time=75.222 ms
^C
--- wikipedia-lb.esams.wikimedia.org ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 73.034/74.128/75.222/1.094 ms