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

[Warren Kumari]

On Wed, Oct 1, 2014 at 11:14 AM, joel jaeggli via Outages
<outages at 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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-- 
I don't think the execution is relevant when it was obviously a bad
idea in the first place.
This is like putting rabid weasels in your pants, and later expressing
regret at having chosen those particular rabid weasels and that pair
of pants.
   ---maf