Send dhcp-users mailing list submissions to
dhcp-users@lists.isc.org
To subscribe or unsubscribe via the World Wide Web, visit
https://lists.isc.org/mailman/listinfo/dhcp-users
or, via email, send a message with subject or body 'help' to
dhcp-users-requ...@lists.isc.org
You can reach the person managing the list at
dhcp-users-ow...@lists.isc.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of dhcp-users digest..."
Today's Topics:
1. dhcpd.conf fails to push options to fixed-address clients
(Kenneth Porter)
----------------------------------------------------------------------
Message: 1
Date: Tue, 15 Feb 2022 14:58:00 -0800
From: Kenneth Porter <sh...@sewingwitch.com>
To: dhcp-users@lists.isc.org
Subject: dhcpd.conf fails to push options to fixed-address clients
Message-ID: <1A5C62223C26F8288686E1BE@[192.168.69.69]>
Content-Type: text/plain; charset=us-ascii; format=flowed
I use host declarations in dhcpd.conf to assigned fixed addresses to
wireless access points (WAP), printers, and other IoT gear. I'm trying to
assign a fixed address to a TP-Link Archer AX 20 being used as a WAP. The
router sends a DHCP request for a renewed address about every 30 seconds,
filling my dhcpd.log. I ran tcpdump to see what's going on and it looks
like dhcpd isn't sending the requested parameter list which includes the
netmask, lease time, and other useful items that are definitely configured
in dhcpd.conf and which work for all my dynamic assignments. I probably
never noticed it before with other devices because they don't default to a
very short lease time when they don't get one in the DHCPACK.
My dhcpd.conf (after expanding file includes) can be viewed here. I tried
it with hosts at top-level and within a group with the desired options.
<https://pastebin.com/yAjNziqm>
Here's what tcpdump shows. Note how the client requests lease length,
subnet-mask, etc. but the server doesn't send them.
<https://pastebin.com/EbvphXh2>
I'm using dhcp-4.2.5-83.el7.centos.1.x86_64 on CentOS 7.9.2009.
------------------------------
Subject: Digest Footer
_______________________________________________
ISC funds the development of this software with paid support subscriptions.
Contact us at https://www.isc.org/contact/ for more information.
dhcp-users mailing list
dhcp-users@lists.isc.org
https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
End of dhcp-users Digest, Vol 160, Issue 2
******************************************
