I have a 12 mile link that registers on both ends incorporating a 433AH on one end and a 411GL on the other. The oddity is the 433 can ping the 411 but the 411 will not ping the 433. I find this very strange. I can Mac ping the 433 but nothing else. And yes , they are the same subnet , else I couldn’t ping from either end.
Check for some firewall rule blocking icmp on the 433 board in the input chain.
Or lack of routes at one end and a NAT rule making that working ping possible…