Patrick McHardy wrote:
Benjamin LaHaise wrote:
Yes, I am aware of --clamp-mss-to-pmtu, but it doesn't work for
outgoing connections from clients (ie web traffic), as it only looks
at the PMTU on the destination route, not the source of the packet
(the DSL interfaces in question have a 1442 byte MTU while the
destination ethernet interface is 1500 -- there are problematic hosts
which use a 1300 byte MTU). Reworking that is probably a good idea at
some point, but it's more work than this is.
Yes, this has always annoyed me too as it doesn't really work for me
in a similar setup where traffic first goes through an IPsec tunnel,
then through a MSS mangling gateway and then over a DSL line. I'll
add a patch on top of yours to take the MSS in reverse direction
into account.
This gets a bit too ugly because of rp-filters and actually might
not properly work in setups with routing by fwmark, so I'll leave
it as it is, its probably better to manually set the MSS in these
cases.
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