What I would like to do is reduce the MSS for low priority traffic using ipchains based on a fwmark value. Is it possible to do this?
ipchains, or iptables? you should be able to do it with a single rule with iptables:
iptables -A OUTPUT -p tcp --syn -m mark --mark XX -j TCPMSS --set-mss XXX
although i've never done this myself...
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