PMTU broken

Ryan Rawdon ryan at
Tue Apr 17 23:24:35 CEST 2012

From a host behind a 6in4 tunnel a request to 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
--2012-04-17 17:17:16--
Resolving ( 2001:558:1002:4:68:87:29:36,
Connecting to (|2001:558:1002:4:68:87:29:36|:80... connected.
HTTP request sent, awaiting response... ^C

This only happens with 2001:558:1002:4:68:87:29:36.  2001:558:1004:9:69:242:76:78 (which I've seen listed for though I do not see it in DNS currently) does not have this problem

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