Pre-Populated ARP Table

In certain topologies remote IPsec endpoints can require access to core network hosts reachable through a Oracle Communications Session Border Controller core interface. In these instances, the OCSBC receives the tunneled packet, and masks the received IP destination address against its own local addresses to determines if direct delivery is possible. If so, the OCSBC issues an ARP request to obtain the physical destination address.

This process can be expedited by pre-populating the interface-specific ARP table with a list of commonly accessed core network host reachable by that interface. With the ARP table pre-populated with IP addresses, the ARP process issues ARP requests at 5 second intervals until a response is received. Once the pre-populated IP address has been resolved, periodic ARP refreshes are used to maintain the currency of the resolution.