Duplicate Ip Addresses - Telos Z/IP ONE User Manual

5.
At the command prompt, type "arp -a". Make sure you do this right after the unsuccessful ping command.
This command displays the physical addresses associated with IP addresses that have been recently used.
6.
The table shows one entry for the 192.168.123.10 address which we discovered in step 2, above. It does not
show an entry for 192.168.123.15, which indicates that no device answered this address. If there had been
an IP device that does not answer pings, we still would expect to see its address in the arp table.
With this last test complete, we can be pretty confident that at this time, the 192.168.123.15 address is available.
There is no guarantee that this address will remain valid forever. There may be a PC that uses this address that just
wasn't turned on at the moment. So keep an eye out for signs of duplicate IP addresses on the network. And notify
your IT department (or whoever is responsible for assigning IP addresses within the organization) ASAP that you
are using this address. Read the following section for the gory details.

Duplicate IP Addresses

Duplicate IP addresses can be difficult to diagnose. Some PCs may give you a warning at boot up that the currently
configured IP address is in use. But other times, duplicate IP addresses are only discovered when an IP device behaves
strangely. For example, you know you assigned a particular IP address to your Z/IP ONE, but now you cannot open the
web configuration page at that address. Or perhaps, sometimes it works, but other times, it does not.
The method to diagnose a duplicate IP address conflicting with your Z/IP ONE is to learn the hardware address
(also call the physical or MAC address) of your Z/IP ONE, and to use the "arp -a" command from a PC to watch
the hardware address associated with your Z/IP ONE's IP address. Your Z/IP ONE's hardware address is available
on the interface status page for each available streaming interface.
If you ever find a different hardware address associated with your Z/IP ONE's IP address, it is time to call your
IT department. Or, if an IT department is not available (since you're reading this section anyway), just assign a
different IP address to your Z/IP ONE.
WHEN AN IT DEPARTMENT IS NOT AVAILABLE |
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