How is that firewall working? Is it just a L2/Virtual Wire setup? By the looks of the connections and IP addresses, it must be L2. But any time I've worked on firewalls at L2, they don't have IP addresses assigned to their interfaces that pass traffic. That's usually done in a routed configuration and they are on different subnets. These are on the same subnet but are on 2 different interfaces.
The MAC addresses look odd also, a little off from typical vrrp. If the firewall was running vrrp on .254, then it should be in the arp table, which it's not included in the snippet you provided. The mac address for .252 indicates the vendor is Nexcom, which I'm not familiar with.
Also, if there's vrrp, is there a second firewall unit not shown on your drawing? Can you ping the radius server from the router?
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