Extracting External IP Address from Sniffed Packets

As the title says, I am wondering if it is possible to know the external address of an access point (attributed by the ISP) just by sniffing the packets it emits and without being connected to it.

8 Responses

Are you referring to a wireless AP?

Yes exactly.

Yes, you can get the external IP address on every packet sent from that AP.

Can you please describe the eventual scenario?

First, when you sniff the packets coming from the AP, capture them with Wireshark. Then, you can analyze them and in each IP header you will find the IP source address.

Correct me if I'm wrong, but that would require me to be connected to the AP. I am asking if I can dump some packets (using airodump for example) from a wireless access point which I don't have access to, and then extract the external IP address (if possible).

If you are sniffing between the client and the AP, then packets are encrypted. Once they leave the AP and are heading to their destination, you can sniff and get the IP.

I understand. Thank you so much for the clarification!

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