Tracking a DHCP address

[sue77]

I use dhcp on a windows 2000 advanced server with Cisco switches.

What is a good cheap software that will allow me to track a dhcp address to a switch port?

Thanks

 

[brontosaurus]

you probably know this, but if you want, you can track it indirectly without extra software....from any workstation if you do an NBTSTAT -A followed by the IP address you're trying to track, it will return a MAC address as well. Then, on your Cisco switch, if you have privileged access, you can do a &quot;show cam <MAC>&quot; which should return the appropriate port....

 

[sue77]

Nbtstat -a won't work because they are not signing onto the domain. They are cancelling past that part. I have the Mac address, but it is not one of our issued computers. I need to track what port they are connecting to.

 

[brontosaurus]

ok, if you have the MAC then you can go right to the switch and do the &quot;show cam&quot;. Give it a try...

 

[sue77]

What if I have 27 switches? Do I go to each one?

Show mac....is that done with hyper terminal?

 

[brontosaurus]

yeah, you can do a show mac via hyperterminal or any telnet application, or the console port of the switch. as for whether you'd have to go to all the switches, i suppose that would depend on whether or not you're trunking and using vlans. if you are, the switch you start from might know that the mac address exists on another switch, and could point you to the switch that contains it...

 

[brontosaurus]

sorry, typo, that's a &quot;show cam&quot; not a &quot;show mac&quot;....