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Today's Topics:
1. dhclient failed to send packet (DHCPRELEASE) on Debian 11 (vom513)
----------------------------------------------------------------------
Message: 1
Date: Sat, 21 Jan 2023 05:29:11 -0500
From: vom513 <vom...@gmail.com>
To: dhcp-users@lists.isc.org
Subject: dhclient failed to send packet (DHCPRELEASE) on Debian 11
Message-ID: <362dea27-578b-47db-8db1-79cecd6ae...@gmail.com>
Content-Type: text/plain; charset=utf-8
Hello all,
So this seems to have been covered multiple times on the list and other various
places. However, I don?t see a solution (assuming that there is one). Most of
the google hits I get are folks with extremely strict firewall rules that end
up blocking this outbound packet. That doesn?t apply to me - I run nftables
and I don?t have an ?output? policy doing anything.
This is a Debian 11 (bullseye) machine - it?s my firewall. dhclient is from
the isc-dhcp-client package with version 4.4.1-2.3+deb11u1, and kernel is
5.10.0.
So while this doesn?t actually *break* anything per se - it certainly drives me
crazy not knowing what?s happening and how to fix it.
It seems like perhaps a race condition ? Could it be that the interface is
?down? and then dhclient tries to send the RELEASE ? I see this essentially
when I do an ?ifdown?. However - I don?t see it 100% of the time :/
--
Jan 21 04:17:30 ice dhclient[303659]: DHCPRELEASE of 1.1.1.1 on enp1s0f4 to
2.2.2.2 port 67
Jan 21 04:17:30 ice dhclient[303659]: send_packet: Invalid argument
Jan 21 04:17:30 ice dhclient[303659]: dhclient.c:2879: Failed to send 300 byte
long packet over fallback interface.
?
I even added logging to my input ?clean up? rule in nftables - I recreated this
issue and I saw nothing in logs to indicate any packets were dropped/denied.
Thanks in advance for any info.
PS: I know this message is very Debian heavy. I?m certainly willing to jump on
a Debian mailing list/forum/bugtracker etc. if need be. I just figured I would
start here. I also figured that if this were a Debian bug - surely this would
have been addressed long ago ?
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