Re: schein.debian.org

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'

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38,369       122K/s   in 0.3s

2011-06-01 19:11:47 (122 KB/s) - `Release' saved [38369/38369]

  $