374.2239 changelog - mtu clamping?

[sinshiva]

i'm using a script that changes the mtu on all the interfaces on my n66, i'm curious if anybody has any details on the 'mtu clamping' of the changelog?

 

[RMerlin]

i'm using a script that changes the mtu on all the interfaces on my n66, i'm curious if anybody has any details on the 'mtu clamping' of the changelog?

I won't know until the source code is available, but it might be the following fix that I implemented a few weeks ago.

 

[sinshiva]

ok, looks like it's not applicable to me. thanks

[edit/] at least, until you see the code lol

 

[sinshiva]

is this used for openvpn client mode on the router? it was very helpful to me just dealing with a nonstandard wan mtu. i assume it's automatically used by the router for pppoe wan. that's actually where i re-found this trick, somewhere talking about dealing with MSS for pppoe connections that i stumbled across while searching for a way to do something like wmm 'no ack' for all tcp streams.

[edit/]

the example i found used;

iptables -I FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS  --clamp-mss-to-pmtu

which is to say, it does not specify an interface. works very well for me, at least