I've been noticing the same problem: hangs on IPv6 enabled hosts when
doing aptitude updates...
The solution is to set the MTU to 1280 as follows:
$ sudo ifconfig eth0 mtu 1480
$ wget -6 http://security.debian.org/dists/squeeze/updates/Release
--2011-06-01 19:11:12--
http://security.debian.org/dists/squeeze/updates/Release
Resolving security.debian.org... 2001:4f8:8:36::6
Connecting to security.debian.org|2001:4f8:8:36::6|:80... connected.
HTTP request sent, awaiting response... ^C
$ sudo ifconfig eth0 mtu 1380
$ wget -6 http://security.debian.org/dists/squeeze/updates/Release
--2011-06-01 19:11:31--
http://security.debian.org/dists/squeeze/updates/Release
Resolving security.debian.org... 2001:4f8:8:36::6
Connecting to security.debian.org|2001:4f8:8:36::6|:80... connected.
HTTP request sent, awaiting response... ^C
$ sudo ifconfig eth0 mtu 1280
$ wget -6 http://security.debian.org/dists/squeeze/updates/Release
--2011-06-01 19:11:47--
http://security.debian.org/dists/squeeze/updates/Release
Resolving security.debian.org... 2001:4f8:8:36::6
Connecting to security.debian.org|2001:4f8:8:36::6|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 38369 (37K) [text/plain]
Saving to: `Release'
100%
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====================================================================>]
38,369 122K/s in 0.3s
2011-06-01 19:11:47 (122 KB/s) - `Release' saved [38369/38369]
$
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