DHCPOFFER rejected by rule

[Bjørn Mork]

Matthew Butch <apple4ever at me.com> writes:

> Here is an issue I can't figure out. I've search to no avail.
>
> I have ISC DHCP running on one server (10.1.1.5) and a Cisco switch
> acting as a DHCP relay across VLANs.
>
> dhclient on Ubuntu 16.04 is reporting DHCPOFFER from 10.10.1.1
> rejected by rule 10.10.1.1 mask 255.255.255.255.
>
> Yet there is no reject command in the list. Where is this coming from
> and how do I fix?

This can be caused by issues with the dhcp client option request
config.  See for example

https://bugzilla.gnome.org/show_bug.cgi?id=778430#c10
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854186
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854343

These are related to NetworkManager generated dhclient configs, but the
underlying issue is applicable to any dhclient config with buggy
"request" lines.


Bjørn