Cant help you finding out if the IP is in use, but it would be a good time
to start a spreadsheet with all IP address's on it. DHCP Ranges and
individual hard assignments. Will make it much easier next time.

Bob

Bob Crothers
www.BJsBariatrics.Com
------------------------------------------
If you think dogs can't count, try putting three dog biscuits in your
pocket and then giving Fido only two of them.
~-Phil Pastoret


On Thu, Aug 14, 2014 at 3:43 PM, David Gibbs <david@xxxxxxxxxxxx> wrote:

On 8/14/2014 1:55 PM, Jeff Crosby wrote:
It does not show up in arp -a

My guess is that the IP isn't actually up then.

Here's my rationale:

When you ping the IP, the system has to determine the MAC address in order
to address the system (I think).

To do this is does a broadcast asking who has that IP. The system who has
that IP _MUST_ respond (if it can).

Once the system responds to the broadcast with it's mac address, that
address gets put in the arp table.

Once the mac address is in the arp table, the ping process can start ...
although the system that responded to the broadcast doesn't have to respond
to the ping.

So if you ping the IP and there is no entry in the arp table, then the
system isn't able to respond.

At least that's my theory. :)

david

--
IBM i on Power Systems: For when you can't afford to be out of business!

I'm riding a metric century (100 km / 62 miles) in the 2015 American
Diabetes Association's Tour de Cure to raise money for diabetes research,
education, advocacy, and awareness. You can make a tax deductible donation
to my ride by visiting http://email.diabetessucks.net. My goal is $5500
but any amount is appreciated.

See where I get my donations from ... visit
http://email.diabetessucks.net/mapdonations.php for an interactive map
(it's a geeky thing).
--
This is the PC Technical Discussion for IBM i (AS/400 and iSeries) Users
(PcTech) mailing list
To post a message email: PcTech@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/pctech
or email: PcTech-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/pctech.


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.