HP Procurve Switch

I have access to the internal web page of the switch, but how do I find out the broadcast address of the Vlan?

Got it. I see where you are going with this, however I don't think it will work in our case. I need to find out the IP address of the device connected to Port E14 on our switch. This port is 1 of 4 ports on a VLAN. This VLAN is a public VLAN.

Basically we have the ISP cable running into the VLAN (4 port VLAN). One of these ports runs straight to the firewall, and then the firewall back into the private VLAN on that same switch.

ISP > Public Vlan > Firewall > Private Vlan

We need the public VLAN because we have the video conference system that needs to sit on the outside. So it is one of the things plugged into the public vlan.

Does your switch have SVI on the public VLAN with an IP address. If yes then you can issue a ping and check the IP,MAc,PORT associations via show arp

I'm not sure what SVI is and whether my switch has it or not. Is there a command i can issue via telnet to tell me all the info about port E14?

When I do:   SHOW MAC   I see the mac addr of port E14. Any other commands that can take me one step further and get me the IP?

Or better yet, is there a command that can show me the ARP of the Public Vlan, instead of the Private Vlan.

In the telnet session when I do SHOW ARP it only shows me private network addresses.

Well our Private broadcast is 10.81.255.255. The arp table was populated with a bunch of private addresses. I then tried pinging all of our public IP addresses, and they all pinged successfully, but when I try to see the arp table, it continuous to only show private addresses.

Since the Video Conference system is sitting in front of the Firewall, the firewall would not have any information about it.

Or you can use any other host connected to that Public VLAN to acquire that ARP information.

Thanks, your guidance has been extremely helpful, but no luck. The vlan is not routing that is why the arp tables are empty: Show arp vlan 30

Also found Link Layer Discover Protocol useful: Show lldp i r
and Cisco Discover Protocol useful:

show cdp -- Show CDP configuration and neighbors discovered (p. 459)
  neighbors -- Show CDP neighbors. See 'show cdp help' for details. (p. 492)
  detail -- Show neighbor information field-per-line instead of shortened table format. (p. 467)
  neighbors-port -- Show CDP neighbors on specified port only. ([ethernet] PORT-NUM) (p.
(Ex. SHOW CDP NEIGHBORS E14)