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Today's Topics:
1. Re: [EXTERNAL] extremely slow DHCPD startup time (Shane Merritt)
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Message: 1
Date: Tue, 10 Jan 2023 20:55:39 +0000
From: Shane Merritt <smerr...@ua.edu>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: [EXTERNAL] extremely slow DHCPD startup time
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I wanted to follow up to my own post in case someone else encounters this issue
in the future. The problem I discovered was that DHCPD keeps a record of the
last lease for a given client forever so that it can try to give the client
that address again. We had over 300,000 leases in the leases file that were in
a binding state other than active (e.g. expired, free). The majority of these
were no doubt from client devices that will not ever show up on our network
again. At the end of the semester, I stopped the primary and failover servers
and ran a Perl script I wrote to go through and get rid of all these inactive
leases. The load times changed to seconds and we have suffered no ill effects
in the nearly one month since I did this.
Shane Merritt
Office of Information Technology
The University of Alabama
smerr...@ua.edu
From: dhcp-users <dhcp-users-boun...@lists.isc.org> on behalf of Shane Merritt
<smerr...@ua.edu>
Date: Thursday, August 4, 2022 at 2:01 PM
To: dhcp-users@lists.isc.org <dhcp-users@lists.isc.org>
Subject: [EXTERNAL] extremely slow DHCPD startup time
I have a failover pair of DHCP servers running 4.4.2-P1 that handle a DHCP for
a very large wireless network (>75k devices active at any time). The leases
file on these boxes is around 200 megabytes. The problem I am having is when I
need to make a change and restart, DHCPD takes over 25 minutes to start giving
out addresses. I assume this is due to the large lease file. I see that there
are tons of leases in the file that are ?binding state free? that in some cases
are months old. Are there any suggestions to improve this situation?
Shane Merritt
Office of Information Technology
The University of Alabama
smerr...@ua.edu
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