Whenever we create tunnel interfaces, the GRE IP MTU is automatically configured 24 bytes less than the outbound physical interface MTU. Ethernet interfaces have an MTU value of 1500 bytes. Tunnel interfaces by default will have 1476 bytes MTU. 24 bytes less the physical.
Whenever we create tunnel interfaces, the GRE IP MTU is automatically configured 24 bytes less than the outbound physical interface MTU. Ethernet interfaces have an MTU value of 1500 bytes. Tunnel interfaces by default will have 1476 bytes MTU. 24 bytes less the physical.
From