NEC Express5800/320Ma Planning Manual page 44

Site Planning for Systems in an ftGateway Group
Make sure that only layer 1 and layer 2 devices separate the gateway and slave
systems. During a connection, the gateway system assigns the slave system a
temporary IP address from an IP address range reserved by NEC Solutions (America),
Inc. and uses that address for all traffic.
6-4 Express5800/320Ma: Site Planning Guide
system management adapters used in earlier models of
Express5800/320Ma systems.