Appendix B - Network Addresses
150-357-200-02, Issue 2
58
February 9, 1999
HXU-357 List 1
Routers or Gateways
At the place where two or more physical networks interconnect is a device
called a gateway or router that handles linking of networks and routing of data
packets between the networks that are attached to the gateway. If a device can
not find the hardware address associated with a particular IP address on its
own local network, it sends the packet on to the gateway. When the packet
arrives at the gateway, the gateway transfers the packet to the network of the
destination device. The process by which the gateway or router links IP
addresses to hardware addresses is called Address Resolution Protocol
(ARP). Each forwarding of the packet from one device to another is called a
hop. If the device that is to receive the data is not directly connected to any of
the physical networks which are connected to the gateway used by the
sending device, it may take several hops for the packet to reach its destination.
The destination may even be a port on another gateway connected to different
physical networks.
Table 14.
Sample Class C IP Address Plan for the HMS-357
Suggested HMU Addressing for 1 to 32
Chassis
Suggested HXU Addressing for 1 to 32
Chassis
11001000 11001000 11001000 00000001
200.200.200.1 HMU chassis #1
255.255.255.0 Subnet mask
11001000 11001000 11001000 01100101
200.200.200.101 HXU chassis #1
255.255.255.0 Subnet mask
11001000 11001000 11001000 00100000
200.200.200.32 HMU chassis #32
255.255.255.0 Subnet mask
11001000 11001000 11001000 10000100
200.200.200.132 HXU chassis #32
255.255.255.0 Subnet mask