Hi Nay,
My understanding on your setup is that all the equipments involved ( the two SRVs and the 2 Checkpoint nodes ) are on the same VLAN. Please correct me if I'm wrong.
If this is the case, there is no routing involved, and the traffic between the SRVs is direct.
My assmuption is that the 10.56 has the firewall enabled.
Regards
Dan