Firewall: Debian Potato, kernel 2.2.17, ipchains with masquerading
Internal: Mix of Windows 98, Windows 2000 and Linux 2.4.x.
I connected to a site somewhere a while back (can't remember which) to buy something and during the billing process it came back with a message saying that it was logging my IP address (no problems with that) but it showed my external AND internal addresses. This intrigued me so I tried it from a different internal address and it definitely got it right.
I have checked through some of the documentation available and I can't see where this information could come from, so
1) How does this work?
2) How do I block it?
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