Freeradius DHCP and "Failed adding ARP entry: Failed to add entry in ARP cache: Operation not permitted (1)"

Alan DeKok aland at
Tue Aug 3 14:04:39 CEST 2021

On Aug 2, 2021, at 3:57 PM, CpServiceSPb <cpservicespb at> wrote:
> I may be wrong.
> But I detected that the issue appears for udp 0 only.
> If there is udp unicast_IP:67 (for example udp - packets
> receiving from relays) , there is no such issue.

  Yes... if the address is unicast, then ARP works.

  FreeRADIUS could create DHCP packets itself and send them.  But that also requires opening a "raw" socket.  So it will still need special permissions.

  Alan DeKok.

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