Please help me…
How can i change mine Mtu size to 1476.
It will work if i will disable / enable Gre-tunnel.
After reboot, same problem, too large Mtu, mine=1422, received=1476.
Did you set IPSEC encryption of GRE tunnel?
If yes than 1422 is normal MTU for channel. I usually set 1420 for GRE+IPSEC channels.
But my other end is Cisco