On Wed, Oct 1, 2014 at 11:14 AM, joel jaeggli via Outages <outages@outages.org> wrote:
On 10/1/14 6:50 AM, Chuck Anderson via Outages wrote:
While on my Hurricane Electric IPv6 tunnel, I cannot access juniper.net unless I change my local interface MTU. 1500 fails, but 1280 works. I noticed this a few days ago. Before that I had no problems with a 1500 MTU. Is anyone else seeing this issue?
The MTU of your tunnel is lower than 1500.
Chances are the service on the other end isn't able to recieve pmtud messages because it's load-balanced... and the first packet that triggers that (ptb) is sent towards your tunnel ingress.
Welcome to the wonders of IPv6, where fragmentation in the network isn't possible. It's better this way, trust us... W
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