[j-nsp] MTU Compression

[Phill Jolliffe]

Are you mixing up MTU and TCP MSS (Maximum Segment Size), a MSS is not
MTU but can cause MTU issues.

Also beware mixing up JUNOS protocol bgp mss adustment, which are only
for the routers bgp tcp sessions with general MSS rewrite.

The general mss rewrite affects all tcp syns crossing the box.

http://www.juniper.net/techpubs/software/junos/junos92/swconfig-system-basics/configuringtcp-mss-for-session-negotiation.html

bgp session MSS knob has been around for a long time. Not sure which
platforms general tcp mss adjustment is available on. Think is might
be J-Series only or maybe on non J-series with extra hardware to do
MSS change (ASP/MS-DPC etc etc).