Let us say I create a valid packet (contains telnet request) with TTL value less than the TTL value required to reach the destination IP. Will the computer that receive the IP packet with TTL=1 (become 0 after decrement) in the path to the destination IP send any ICMP response to me?
It is always the purpose of all ICMP messages to be triggered by normal IP traffic, in order to report problems. The only exception is ping (i.e. ICMP echo reply is a response to ICMP echo request)– Hagen von EitzenAug 6, 2015 at 15:09
Yes, the router that decrements the TTL to 0 will discard the packet and send an ICMP time exceeded message (type 11) to the source.