Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

The mac address would be that of the router, I presume. But could I distinguish the ip addresses of the computers behind the router, or could I only see a global ip address that belongs to the router?

share|improve this question
1  
The mac is thatthat of YOUR router - MAC addresses are not part of IP and do not get forwarded outside the physical segment, which normally ends at the next switch / ethernet port. SO, you do not even have a MAC address. –  TomTom May 11 '12 at 10:40
add comment

1 Answer 1

up vote 3 down vote accepted

Using Scapy you can graph IP ID fields patterns to know how many distinct IP stacks are behind a NAT, but you may generally not be able to discover the IP behind the NATdevice. Here's a link to the page referencing it.

share|improve this answer
    
And what about dynamic ip addresses? Would scapy not be confused by that if they were completely random? –  Samuel May 11 '12 at 8:58
    
I've updated my answer to make it more clear. –  Maxwell May 11 '12 at 9:08
    
If the devices behind the router use a proxy, Scapy etc. will fail. If neither NAT nor a proxy is used, Scapy will not be needed, as you can identify the hosts by their IP. –  SvW May 11 '12 at 9:15
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.