If using the PPP-SR04 or PPP-SRDSU04 (which allows four computers to be connected to a single dedicated line without local ethernet networking by utilizing the Windows Dial-Up-Networking wizard and the COM: port), then there should be enough node numbers allocated for up to 6 nodes on the subnet. This allows four addresses for workstations, one for the PPP-SR, and one for the host router port. The PPP-SR does not NEED an IP address, but it is useful for troubleshooting the system. The network mask for the host router should be 255.255.255.248. This mask provides for 32 subnets in a class C space. This works for both the obsolete non-zero node number and the current zero node number allocations because both support 6 nodes with this mask. The example in figure 2 presumes four workstations at each remote site.
The addressing schemes listed above will work with virtually any router using either Sync PPP or Frame Relay. Some routers (usually working with Frame Relay transport) can be configured without an IP address on their WAN ports. These routers can use an even finer grained subnet mask (255.255.255.255) which allows 254 remote sites (each with one PC) in a single class C address space.
Note that the PPP-SR products do not require an IP address. However, if one is configured, it can be used to ping (either to or from) the PPP-SR. This is useful when first getting the system up and for future troubleshooting or link verification. The remote computers are always configured to use DUN, and there is usually no networking expertise available at the remote site to assist in troubleshooting. Being able to ping the PPP-SR and the remote computer allows connectivity problem diagnosis to the lowest level without remote networking expertise.
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