Appears to be resolved in 1.56.55 (Build 05).
We have some new PowerEdge R720 servers and are trying to set up the iDRAC on our management network. Our management network is internal; 172.30.0.0/16 with a default gateway at 172.30.0.1. When we configure the iDRAC's IP, the router can ping it, but our management stations outside that subnet cannot. We can ping other, older iDRACs on the same subnet just fine but not the new servers, so we know it's not our network. We run management on tagged VLAN 2 and the server's actual traffic untagged. When we watched network activity from the router, we noticed the iDRAC wasn't even bothering to do an ARP for the default gateway, even though it was receiving the ping packets from the management station. Any ideas? This is the same configuration we've been using for years and it's always worked until these new servers!
PowerEdge R720 iDRAC refuses to use default gateway