[strongSwan] High latencies

Turbo Fredriksson turbo at bayour.com
Tue Sep 19 16:57:11 CEST 2017

This is spooky!!

I ran

    ip link set dev eth0 mtu 1500

on all instances in the chain. Then run

    iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
    iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 128

on both the VPN instances.

Still didn’t work.

I then reverted all that, set the MTU on the interface BACK to 9001 on
all the instances AND deleted those iptable rules - s/-A/-D/g, and all of
a sudden it worked!!

Very spooky!
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