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Here is a related question but I could not figure out how to apply the answer to mechanize/urllib2: how to force python httplib library to use only A requests Basically, given this simple code: #!/usr/bin/python import urllib2 print urllib2.urlopen('http://python.org/').read(100) This results in wireshark saying the following: 0.000000 10.102.0.79 -> 8.8.8.8 DNS Standard query A python.org 0.000023 10.102.0.79 -> 8.8.8.8 DNS Standard query AAAA python.org 0.005369 8.8.8.8 -> 10.102.0.79 DNS Standard query response A 82.94.164.162 5.004494 10.102.0.79 -> 8.8.8.8 DNS Standard query A python.org 5.010540 8.8.8.8 -> 10.102.0.79 DNS Standard query response A 82.94.164.162 5.010599 10.102.0.79 -> 8.8.8.8 DNS Standard query AAAA python.org 5.015832 8.8.8.8 -> 10.102.0.79 DNS Standard query response AAAA 2001:888:2000:d::a2 That's a 5 second delay ! I don't have IPv6 enabled anywhere in my system (gentoo compiled with USE=-ipv6 ) so I don't think that python has any reason to even try an IPv6 lookup. The above referenced question suggested explicitly setting the socket type to AF_INET which sounds great. I have no idea how to force urllib or mechanize to use any sockets that I create though. EDIT : I know that the AAAA queries are the issue because other apps had the delay as well and as soon as I recompiled with ipv6 disabled, the problem went away... except for in python which still performs the AAAA requests.

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