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

[CpServiceSPb]

I use Freeradius 3.0.21 on Ubuntu 18.04 x64 LTS.

It is started under freerad:freerad, acts as DHCP as well listen to 0.0.0.0
IP and accept broadcast on one of two interfaces and listen to
192.168.0.254 and not accept broadcast on other one interface.

During DHCP conversation with clients using broadcast accepting (IP
0.0.0.0) interface, the following message is got and DHCP don' t assign to
the client:
"Failed adding ARP entry: Failed to add entry in ARP cache: Operation not
permitted (1)"

I don' t want to launch Freeradius under either root user or root/admin
group.

What is the best solution to avoid the error under freerad:freerad and move
on ?