[outages] HE IPv6 tunnel PMTU issues with juniper.net

[joel jaeggli]

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.
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