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pppoe and mtu [solved]
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cloc3
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PostPosted: Fri Dec 07, 2012 1:29 pm    Post subject: pppoe and mtu [solved] Reply with quote

My home network is configured in the following way:

modem -- eth1 (pppoe) --- eth0 --- wireless network

all wireless clients need to set by hand mtu=1492 to browse internet.
No, I bought a stupid close device which is unable to set mtu (and which does not read option interface-mtu from dhcpd) by itself.
Anyway, this device browses correctly if connected to internet through a commercial wireless router.

what should I do to browse with my device?
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Last edited by cloc3 on Fri Dec 07, 2012 3:06 pm; edited 1 time in total
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Gusar
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PostPosted: Fri Dec 07, 2012 2:45 pm    Post subject: Reply with quote

Instead of messing with all clients, use this iptables rule on the machine than runs pppoe:
Code:
-I FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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cloc3
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PostPosted: Fri Dec 07, 2012 3:05 pm    Post subject: Reply with quote

wonderfull.
my previous iptables line was no working.

but now the problem is solved.
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