DHCP Broadcasts not seen by radiusd

Hermann.Lauer at uni-heidelberg.de Hermann.Lauer at uni-heidelberg.de
Wed Jun 18 13:16:06 UTC 2025


> On Jun 17, 2025, at 7:40 AM, Hermann.Lauer at uni-heidelberg.de wrote:
> > freeradius is not seeing DHCP broadcast discover messages on the same
> > subnet.
...
>   If you set 'broadcast = yes' in the configuration, it will accept broadcast packets.

Which is set, but seems not to show up in the -X debug output.

>   That flag sets a socket option which tells the kernel to forward broadcast packets to FreeRADIUS.

Found my error:
 ipv4addr = 0.0.0.0
or
 ipaddr = 0.0.0.0
needs to be set to recieve non subnet broadcasts.

Thanks and greetings
  Hermann

PS: "ss -f inet -a -e" helped to see this

-- 
Administration/Zentrale Dienste, Interdiziplinaeres 
Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg
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Email: Hermann.Lauer at iwr.uni-heidelberg.de


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