[143432] in North American Network Operators' Group
I'm missing 2 bytes (GRE implementation)
daemon@ATHENA.MIT.EDU (Franck Martin)
Tue Aug 9 20:58:16 2011
From: Franck Martin <fmartin@linkedin.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Wed, 10 Aug 2011 00:57:44 +0000
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I'm using a GRE IPv4 tunnel between a cisco and linux machines
I did some packet capture, and saw that my MTU was 1418, but the cisco was =
sending TCP packet with a MSS of 1380. This created a bunch of issues. When=
I told the cisco box to use a MSS of 1378 everything starting to work fine=
.
So why Cisco is off by 2 Bytes?
Does the GRE implementation on Linux uses 2 extra bytes compared to Cisco (=
or vice versa)?
