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NAT

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Im looking for a good article on finding internal IP's from just knowing the public IP address. I read the RFC 1631 on NAT, but it just said you cant see internel IP's (I know thats not true). Does it help if I know some internel hosts, like 192.168.1.1 might be the gateway.

Thanx for your help, anything can help me with this complex topic. Im not a full on noob, so you can get a little technical.

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Find the MAC address associated with the public IP. If the router's WAN has not been cloned, you can determine who manufactured the router. Then you can figure out what the default LAN IP is and the default DHCP scope. You can assume the first few IPs in the scope have been assigned to the computers on the LAN... This also assumes the user has not changed the LAN IP, adjusted the DHCP scope, and has their computers setup to obtain IPs automatically.

Even with this info, there is not much you can do... NAT routers block all unsolicited inbound requests and use private IPs on the inside. Unless a port has been forwarded to an internal IP, you won't be able to get in.

Edited by bob_oliver
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Noob question here.. If there is a forwarded port on the NAT/router could it be used as a gateway to nmap other host on the inner LAN or just the host that is receiving the packets from the forwarded port?

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Noob question here.. If there is a forwarded port on the NAT/router could it be used as a gateway to nmap other host on the inner LAN or just the host that is receiving the packets from the forwarded port?

That is essentially the idea behind loose source routing, as Hiryu mentioned.

--ed

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