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Consider a very large netwrok of 10000 routers . Two Hosts A and B are connected with this network and after some unit of time host A receives ICMP TTL exceed message for  the same data packet. The maximum number of routers that can be travelled by packets when ICMP message reaches back to A _____
asked in Computer Networks by Loyal (6.4k points) | 88 views
Is it 255?
answer given is 509

255(going forward) + 254(icmp coming back)
If we consider only one way then ,

Max value of TTL will be 255 hence it can take max 255 hops to reach destination ==> in between it can travel 254 routers right ??
It didn't reach destination that's why ICMP error came. So the router at which TTL becomes 0 will also be counted.

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