On Wed, 2018-02-07 at 17:38 +0100, Yves-Alexis Perez wrote: > Starting with 4.14.16, IPv6 traffic is broken. When trying a simple ping > to an IPv6 address I get: > > ping: sendmsg: Invalid argument I forgot an important bit of information: due to the way routers usually broke path MTU discovery by filtering ICMP, I'm lowering the MTU to 1280 (so exactly IPV6_MIN_MTU) when using IPsec. The MTU is configured by the IKE daemon (strongSwan, thus adding Tobias to CC:) in routing table 220: default via 192.168.28.254 dev eth0 proto static src 192.168.0.129 mtu 1280 advmss 1320 I'll try to printk the mtu before returning EINVAL to see why it's lower than 1280, but maybe the IP encapsulation is not correctly handled? Regards, -- Yves-Alexis
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