From Anorexic Tortoise, 4 Weeks ago, written in Plain Text.
  1. ip link add mygre1 type ip6gre local <local> remote <remote>
  2. ip link set mygre1 mtu 1476
  3. ip link set mygre1 up
  4. ip -6 addr add <local> dev mygre1
  5. iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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