How does a masqueraded ping packet return?

I'm using IP masquerading to allow access to the net for my private network.

I was wondering since masquerading is done only on TCP/UDP packets, how did the response to my pings come back to the private network?

Moreover, ICMP packets don't specify source ports which is required for masquerading.
vincesimAsked:
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j2Commented:
the packet handler in the Linux keeps track of the packet serial numbers, and rewrites the packages as they are sent / received. Just as long as ICMP masquerading is enabled in kernel / modules.

Portnumber is not required for masquerading, only for TCP. ICMP can be masqueraded, or atleast 'faked' as long as the masquerading host has the proper code to handle it all.
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vincesimAuthor Commented:
Thanx for the response. Know of anywhere I can find out more about how ICMP gets masqueraded? Like man pages or any other web resource?
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j2Commented:
I would suggest the sourcecode for the masquerading parts of the kernel.. Never seen any "howto" on the technical side.

Sorry.
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