in reply to Re: Mac Addresses
in thread Mac Addresses

That script may not be portable to other routers (or even work on some simple routers or that don't support SNMP). Nor would the router know about MAC's that haven't passed a packet through. But it gave me a good idea.

Assuming this all on a local net and the subnets are not firewalled from each other (ie. no firewall between the local subnets - Firewalls between the local net and the internet would be fine). Just ping each ip in the net. If this is your local net you should have no problem getting the network info.

Then all you have to do poll you local ARP table. Which far easier than wirting a custom router poller.



grep
One dead unjugged rabbit fish later

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Re^3: Mac Addresses
by NetWallah (Canon) on Oct 04, 2006 at 19:30 UTC
    Your first paragraph makes valid points, but your conclusion :
    -- all you have to do poll you local ARP table --
    will not work if you have multiple routed subnets, because of proxy ARP.

         "For every complex problem, there is a simple answer ... and it is wrong." --H.L. Mencken

[reply]
      Good point - Though it should be easy to determine if the router is proxying arp requests (lot's of IP's with the same MAC).

      The only really reliable way of getting all MACs, I can think of would be polling SNMP enabled switches, assuming that each subnet is running switched traffic.



      grep
      One dead unjugged rabbit fish later
[reply]

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