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

[Chuck Anderson]

On Wed, Oct 01, 2014 at 08:14:52AM -0700, joel jaeggli via Outages 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.

Chances are the first large packet is from the server end, not my
client end.  So if www.juniper.net sends a 1500-byte packet, it should
arrive at the HE.net tunnel router and that router should send a PTB
back to the server.  Are you saying the PTB might not be received by
the server because it is behind a load-balancer?  Shouldn't the
load-balancer handle the PTB directly in that case since it terminates
the TCP connection?