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Home: Perl Programming Help: Intermediate:
Mac address to IP


New User

Feb 6, 2013, 5:33 PM

Post #1 of 2 (1083 views)
Mac address to IP Can't Post

Hi there

I'm in the process of coding up a piece of middleware to take information from our wireless lan controller and pass it up to our web filter. I'm currently a bit stuck because the WLC syslog contains user names and MAC addresses but no IP addresses.

How can I quickly turn MAC addresses into IP addresses so that I can pass which username belongs to which IP up to the web filter?

This script runs on a Debian Linux box so I'm happy to hand the MAC off to an external program. I had considered using arping but concluded that would likely be too slow.


Veteran / Moderator

Feb 7, 2013, 6:16 AM

Post #2 of 2 (1065 views)
Re: [Harfish] Mac address to IP [In reply to] Can't Post

How can I quickly turn MAC addresses into IP addresses

You can't.

MAC addresses and IP addresses don't represent the same thing, so you can't turn one into the other.

However, if you're on the same LAN you can use ARP to lookup the mapping between the addresses.

Another option, assuming all devices are using DHCP, you could check the dhcp log to find the mapping.

(This post was edited by FishMonger on Feb 7, 2013, 6:19 AM)


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