On 2017-06-02, Dario Lesca <d.le...@solinos.it> wrote: > Yesterday I have update my fedora 25 and after reboot VPN l2tp+ipsec do > not work anymore. > > The connection happens without problem, the routing are set correctly, > the DNS (UDP protocol) and ping (ICMP protocol) to remote host work. > > Only the access to some server, like ssh or smb:// (TCP protocol) do > not work, in this case, if I monitoring on remote server with tcpdump, > none arrives. > > If I reboot with previous kernel (4.10.17) all work fine. > > Some suggest? > Is MTU path discovery broken? I.e. IP packets bigger then MTU of the tunnel do not pass. You can try to send ICMP packets with bigger and bigger size while don't-fragment bit is set. You can use ping tool for the tests.
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