i want to enter two more fields in the icmp packet so as to send some extra information that i can decide. i suppose it is more easy to enter them at the end of the packet.can anyone knows how to do this?i was thinking of someone making a icmp question like traceroute and the other will reply with time exceeded and the extra field. there is and some new rfc 4884 that indicates the icmp extension but it isnt implemented yet by anyone