icmp masquerading

From: Kenneth Stephen (pgmr@austin.rr.com)
Date: Fri Nov 16 2001 - 22:41:15 EST


Hi,

        My understanding of masquerading is that packets from the
masqueraded host are remapped to a different port on the masquerading
host and sent out. How does this work with ICMP where there are no port
numbers in the protocol? If A is the masquerading router and B is the
masqueraded host, how is it possible to distinguish a ping to C from A and
a ping to C from B?

Thanks,
Kenneth

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