RE: gre tunnel MTU adjustment
Perhaps you want to say:
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j
Another simple possibility for small networks is to adjust
the default MSS of every client to something about 1400.
(that value fits for nearly every kind of tunnel)
PS: Something like a crazy workaround is to establish two tunnels and
bundle them with MPP. Finally you could get 'virtual' 1500 MSS.
Normally used for real time traffic solutions.
From: Teun Vink [mailto:email@example.com]
Sent: Thursday, May 15, 2003 10:33 AM
To: Jeff S Wheeler
Subject: Re: gre tunnel MTU adjustment
I use a GRE tunnel between my DSL connection at home and the network of
the ISP I work for. I use this iptables line in my setup, which fixes
the MTU for all outgoing packets:
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp
Works just fine...