IP addresses on 4108gl and 2524

[Frank N. Stein]

Is there any way (without buying a specialized app) to get a list of what IP addresses are currently using what ports on a Procurve 2524 and a Procurve 4108gl?

[JOB CACKA · Accepted solution]

From the command line interface you can get a list of the MAC addresses associated with each port using the command 'show mac'. I think this is per VLAN, but that might be something else I am thinking of.

Also, once you have the MAC/port info you can gather the IP address information you are looking for by using wireshark to sniff all of the ports for a couple of minutes and then query the output you gather for IP addresses.

Remember that layer 2 is MAC, and layer 3 is IP.

The 'show' command cannot hurt any setup information, and I would recommend looking at 'show ?' and see what is there. If you need specific help with a command that is available from the CLI as well. Also, google is your friend and there should be a CLI manual for the 4108gl readily available.

Oh, and Have Fun!

[Frank N. Stein]

Wireshark...I shoulda thunk of that!
Thank you for all of the info.

Fun?
Hmmm...well, at least I'm not dealing with something like 500 IPs.

Maximum pointage applied for the answer.

[EckerA]

i don't know if your switches do support it.. but you can try with dhcp snooping, if you are using dhcp in your network..
with dhcp snooping you can get a list of ip to port

hth
alex

[Frank N. Stein]

DHCP snooping?
I'll read up on that and give it a try.
Does anybody in here know if the two switches in question (4108gl and 2524) support it?

[JOB CACKA]

DHCP Spoofing is a good idea. It reminded me that when we were troubleshooting a network problem here we used our dhcp leases file (dhcpd.leases in Linux) and grep to cross reference IP addresses to MAC addresses. Unfortunately we run a mixed environment, and only about a third of our IP addresses are dynamically allocated.