ICMP echo request.

kenneth.reeves at verizon.com kenneth.reeves at verizon.com
Mon Nov 19 19:22:45 UTC 2007

	Thanks for your reply.  What you stated is what I expected the
answer to be.  And yes, I will give serious consideration to upgrading.

-----Original Message-----
From: dhcp-users-bounce at isc.org [mailto:dhcp-users-bounce at isc.org] On
Behalf Of Glenn Satchell
Sent: Sunday, November 18, 2007 5:22 AM
To: dhcp-users at isc.org
Subject: Re: ICMP echo request.

Wow! 3.0.1rc9 is truly ancient. There were about another half dozen
release candidates before 3.0.1 came out, then we got to 3.0.6 and
3.1.0. So that would be 6 or 7 years old at least. You really, really,
really need to  upgrade.

The ping is "ping before offer" happens before offering an IP address.
That is, before replying to a DHCPDISCOVER.

When a renew comes in as a DHCPREQUEST, the device already has the IP
address, so a ping would always return true in this case.

In later versions an option was added to desable the


>Date: Fri, 16 Nov 2007 14:35:48 -0600
>From: <kenneth.reeves at verizon.com>
>Under what circumstances does the server ping an address to before
>assigning it to a client?  If I read the book correctly, it will always
>ping the client.  At first I thought it only pinged the address if
>was an expired lease. Then I thought, that it may want to check to see
>if somebody accidently statically assigned  an address in the pool to
>their client, not knowing it was in the pool.  In such situations, it
>good to ping no matter what the circumstances to determine if the
>address is in use.  Also, does it act differently, with regard to a
>ping, for a renew vs. a request?  I checked the archives as well, but
>didn't see anything there.   I am using DHCP Server V3.0.1rc9.  It
>great BTW.  If someone could direct me to an article or achieve, that
>would be great.
>Ken Reeves

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