Which statement is true about IP-IP tunnels?
Which statement is true about IP-IP tunnels?
In IP-IP tunnels, the time-to-live value of the original packet is decremented. This is consistent with the standard behavior of IP tunneling as it helps prevent routing loops and ensures proper packet lifecycle management.
IP tunnel carries only IP protocol. GRE tunnel doesn't care about underlying protocols. Original TTL value is decremented on IP-tunnel encapsulation.
A. ref.: RFC 1853; RFC 2003
The encapsulator does not change the inner IP header, except to decrement the time to live (TTL), and it remains unchanged during its delivery to the tunnel endpoint. A is the correct answer
A is correct. GRE tunnel is protocol agnostic
TTL has to be decremented and ipip only carries IP
The time-to-live value of the original packet is decremented.