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gloomer

Network question

3 posts in this topic

This is going to sound like a stupid question. Lately I've been at a few hotels and different places with free internet access.

Just out of curiosity, I went to a site like whatismyip.com, and I seem to get an internal 192 address?

This has happened many many times. I'm not quite sure why.

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What were the rest of the addresses? Not everything 192.*.*.* is RFC 1918 private. Only 192.168.*.* .

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Are you sure it's a 192.168.x.x address? In RFC 1918, a 16bit block (Class B ) is reserved for non-routable internal IPs. Did the IP match the local IP that you were assigned when you connected to the network? If you are sure it's in this block, it's possible that you are being proxied and the that proxy server is leaking your internal address in the http header. An attacker could nefariously get someone's internal IP address (http://www.metasploit.com/research/misc/decloak/), but I seriously doubt whatismyip are doing this because it would defeat the purpose.

Hope that helps...

Uncue

Edit: Sorry for duplication. Someone came in my office as I was writing this and McGrew beat me to the punch.

Edited by Uncue
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