PMTU is spelled "mtudisc" :-) $ sysctl -a |egrep mtudisc net.inet.ip.mtudisc = 1 net.inet.ip.mtudisctimeout = 600 net.inet6.icmp6.mtudisc_hiwat = 1280 net.inet6.icmp6.mtudisc_lowat = 256 You really need a working sysctl, though.
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