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I must disagree with @vahid. If there are multiple hops between the NAT and the host to which the connection is being port-forwarded, you may actually be able to elicit an ICMP TIMEX message. As you may know, every IPv4 packet has a 1 byte TTL field. If you determine the distance to the NAT (say 10 hops) and the actual concealed host is actually 12 hops ...


What you are trying to achieve is not possible, by design. The only way of achieving this is by having access to either the gateway or the host machine. A NAT device serves the dual purpose of sharing an internet connection with an internal network and protecting the internal network much like a traditional firewall would. [edit] I stand corrected. The IETF ...

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