besides setting MTU to 1480, it is wise to do:
# /sbin/iptables -I OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS 
--clamp-mss-to-pmtu
# /sbin/ip6tables -I OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS 
--clamp-mss-to-pmtu
because there still are firewalls out there that can't handle fragmentation.

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https://bugs.launchpad.net/bugs/1254085

Title:
  ssh fails to connect to VPN host - hangs at 'expecting
  SSH2_MSG_KEX_ECDH_REPLY'

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