Converting from GNU radius for a computone Client and an OpenVPN client using port 1645

[The Doctor]

Currently I wish to convert from GNU radius to Free Radius.

I have a computione intelliserver on 192.168.5.4 using Shread
"Secret" to access to unix passwd file on 192.168.5.1 .

my gnu clients file

has server as wraparound and non-server like Routers and terminal servers
using Secret

My clients.conf as

server local ns1 foobar 1645 1646
source_ip ns1
timeout 3
retry 1

A config file with

option {}
logging{}
auth {}
acct {}
rewrite []

All defined

Hints file

DEFAULT Rewrite-Function = restore_nas_ip  Fall-Through = Yes

Naslist  with localhosy and 192.168.5.4 defined

nastypes typically defined

realms files

domain  ns1:1645
domain  ns2:1812

users

DEFAULT Auth-Type = System,
        Simultaneous-Use =1
	Service-Type = Framed-User,
	Framed-Protocol = PPP,
	Session-Timeout = 1day .

What is needed to convert this to Freeradius 3?

Openvpn radius plugin will assume to be not adjusted.
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