Comcast6.net PMTU broken

[Jeroen Massar]

On 2012-04-17 23:24 , Ryan Rawdon wrote:
> From a host behind a 6in4 tunnel a request to www.comcast6.net hangs.  It looks like a PMTU brokenness issue since the connection is established and the request is sent successfully.
> 
> Requesting the same page from a host with a 1500B path MTU succeeds.
> 
> nova-dhcp-host111:tmp ryan$ wget http://www.comcast6.net

Try 'tracepath6' it will show you which hop is not returning a packet
too big for that path if needed. Also one can use a series of "ping6 -s
<size> -M do" to check if packets pass or not (if the destination allows
pings of course).

Greets,
 Jeroen