No DHCP server found (stable/12 & stable/13)

From: David Wolfskill <>
Date: Fri, 22 Apr 2022 07:10:46 UTC
(This may also apply to head; I haven't tested it recently, and testing
is a little awkward for me just now. -- dhw)

As I type, I am 9 time zones east of home.  The laptop I am using is

FreeBSD localhost 13.1-STABLE FreeBSD 13.1-STABLE #468 stable/13-n250522-48a5e3fc6568: Wed Apr 20 05:25:39 PDT 2022 amd64 1301501 1301501

I have seen an apparently-similar set of symptoms on a different laptop
(that I use for the bulk of my day-to-day activities when I am not
wandering about (e.g., in different time zones)); it was running:

FreeBSD 12.3-STABLE #1236 stable/12-n235174-879a6b7b628: Tue Apr 19 03:32:12 PDT 2022  amd64 1203507 1203507

when I last observed the issue.

In each case, I have no problems associating (if using wireless) and
acquiring a DHCP lease at home (where the DHCP server is
net/isc-dhcp44-server (isc-dhcp44-server-4.4.2P1_1), currently running:

FreeBSD 12.3-STABLE #59 stable/12-n235169-6def5bc64cb: Fri Apr 15 03:31:41 PDT 2022  amd64 1203507 1203507

), nor do I see the problem if I have either laptop associate to my
phone's "hotspot".

But at the hotel where I am no, as well as on the commuter shuttle bus
at work, and a hotel in Los Angeles back in March, I found that dhclient
on the laptop would issue DHCPDISCOVER (repeatedly)... and utterly fail
to recognize any response from a DHCP server.

In searching for solutions, I found a thread, " dhclient does not decode
802.1q-encapsulated replies #114 " at - I have no idea if it's
related to what I am seeing.  (While I don't use OPNSense, I do use
ipfw (and have, since around 1999).  I am not at all familiar with VLANs
-- I don't use them in my networks.)

I do use an /etc/dhclient.conf; here are the non-comment lines:

| send host-name "";
| request ntp-servers, smtp-server, routers, domain-name-servers, domain-search, domain-name, subnet-mask, broadcast-address;

though the mtime on that file shows Aug 15 04:40:08 2018 (at which point
I know the shuttle bus DHCP was working for me).

As you may be able to discern, while I do have connectivity enough
to send/receive email, my opportunities for checking and testing
are likely to be quite limited -- more so in a couple of days, once
the cycling tour actually gets under way.

David H. Wolfskill                    
V. Putin does not need "negotiations" to stop his own senseless war.

See for my public key.