Forwarding ICMP packets with NAT
I was hoping to set a linux box up by my router to respond to incoming ICMP packets for a series of WAN delay reading I need, however I'm very confused about exactly how ICMP is handled.
Without using a port I can't configure any port based forwarding, but I have an idea that it might be handled by NAT, is this the case?
Has anyone done this before? The router is a thompson using a propriety unix like kernel from what i can tell.
Any help would be appreciated.
Neil r w