I have had problems in the past when I did not have 'ip mtu 1500' set on the
GRE tunnels due to some (mostly WWW content) providers blindly blocking all
ICMP traffic...
-Scott
-----Original Message-----
From: kevin graham [mailto:kgraham@dotnetdotcom.org]
Sent: Monday, February 04, 2002 6:47 PM
To: Turpin, Mark
Cc: 'cisco-nsp@puck.nether.net'
Subject: RE: [nsp] GRE Tunnel Performance
> I've worked with tunneling on 7200's->2600's, and have noticed that in
real
> life 5-6mbit/s will hose the 2600.
...on the subject (as I'm guessing this is due to beatign the 2600 alive
w/ fragmentation), what is the proper way of adjusting MTU on a tunnel?
'mtu' is unsettable (atleast on the various 12.{1,2} boxes I just
checked). There's 'ip mtu', but I'm guessing this applies to
router-generated packets, and doesn't control fragmentation of transit
packets.
Controlling this would be nice, so PMTU-D could atleast have a chance at
working. Someone please slap me if I'm reading all the wrong things into
this...
..kg..
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