Tunnel Management
For ICMP messages intermediate routers return 64 bits of the datagram beyond the IP header which is not enough to copy Inner header. So the encapsulator will not be able to relay the appropriate message to the original sender. But this can be handled by maintaining the soft state of the tunnel. The soft state information maintained by the tunnel includes the following:
- MTU of the tunnel
- TTL of the tunnel
- Reachability of the decapsulator
Read more about this topic: IP In IP
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