crow ~ % unset http_proxy
crow ~ % ping google.com
PING google.com (173.194.64.104) 56(84) bytes of data.
From balacynwyd-rtr-3-v414.us.oracle.com (10.140.176.2) icmp_seq=3 Destination Host Unreachable
^C
--- google.com ping statistics ---
3 packets transmitted, 0 received, +1 errors, 100% packet loss, time 2008ms

crow ~ % nslookup google.com
;; Got recursion not available from 144.20.190.73, trying next server
Server:		192.135.82.132
Address:	192.135.82.132#53

Non-authoritative answer:
Name:	google.com
Address: 173.194.64.105
Name:	google.com
Address: 173.194.64.106
Name:	google.com
Address: 173.194.64.147
Name:	google.com
Address: 173.194.64.99
Name:	google.com
Address: 173.194.64.103
Name:	google.com
Address: 173.194.64.104

crow ~ % host google.com
google.com has address 173.194.64.103
google.com has address 173.194.64.104
google.com has address 173.194.64.105
google.com has address 173.194.64.106
google.com has address 173.194.64.147
google.com has address 173.194.64.99
google.com mail is handled by 40 alt3.aspmx.l.google.com.
google.com mail is handled by 50 alt4.aspmx.l.google.com.
google.com mail is handled by 10 aspmx.l.google.com.
google.com mail is handled by 20 alt1.aspmx.l.google.com.
google.com mail is handled by 30 alt2.aspmx.l.google.com.
crow ~ % wget google.com 
--2011-11-03 15:23:39--  http://google.com/
Resolving google.com... failed: Name or service not known.
wget: unable to resolve host address `google.com'
crow ~ % curl google.com
curl: (7) couldn't connect to host
crow ~ % wget -4 google.com
--2011-11-03 15:29:39--  http://google.com/
Resolving google.com... 173.194.64.106, 173.194.64.147, 173.194.64.99, ...
Connecting to google.com|173.194.64.106|:80... failed: No route to host.
Connecting to google.com|173.194.64.147|:80... ^C
crow ~ % wget -6 google.com
--2011-11-03 15:31:44--  http://google.com/
Resolving google.com... failed: Name or service not known.
wget: unable to resolve host address `google.com'