[Commotion-dev] Setting masq & MTU values correctly with OLSRd SmartGateway

[Ben West]

Sorry for error.  The iptables rule mentioned above to clamp MTU=1480 for
traffic leaving the mesh zone on the gateway node is incorrect.

OpenWRT deploys a rather convoluted firewall by default, and the iptables
chain "FORWARD" suggested in OLSRd README is not the right chain.  I think
a correct chain is zone_wan (although maybe zone_mesh_forward)?  Certainly,
anyone with better familiarity with OpenWRT iptables convention do please
chime in.

# Clamp all traffic leaving to MTU of OLSRd tunnel MTU
iptables -A zone_wan -o eth0 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--set-mss 1480


On Sun, Aug 4, 2013 at 1:08 PM, Ben West <ben at gowasabi.net> wrote:

>
>
>>>>
>>>>>> So, following the advice from the readme, I added this to
>>>>>> /etc/firewall.user on my gateway node (eth0 is its wired uplink):
>>>>>>
>>>>>> iptables -A FORWARD -o eth0 -p tcp --tcp-flags SYN,RST SYN -j
>>>>>>
>>>>> TCPMSS
>>>>
>>>>>
>>>>>>
>>>>>> --set-mss 1480
>>>>>>
>>>>>

-- 
Ben West
http://gowasabi.net
ben at gowasabi.net
314-246-9434
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