Web OS 10.0 Application GuideChapter 1: Basic IP Routing n 35212777-A, February 2002Defining IP Address Ranges for the LocalRoute CacheA local route cache lets you use switch resources more efficiently. The local network addressand local network mask parameters (accessed via the /cfg/ip/frwd/local/add com-mand) define a range of addresses that will be cached on the switch. The local network addressis used to define the base IP address in the range that will be cached. The local network mask isapplied to produce the range. To determine if a route should be added to the memory cache, thedestination address is masked (bit-wise AND) with the local network mask and checkedagainst the local network address.By default, the local network address and local network mask are both set to 0.0.0.0. This pro-duces a range that includes all Internet addresses for route caching: 0.0.0.0 through255.255.255.255.To limit the route cache to your local hosts, you could configure the parameters as shown in thefollowing example:N OTE – Static routes must be configured within the configured range. All other addresses thatfall outside the defined range are forwarded to the default gateway.Table 1-4 Local Routing Cache Address RangesLocal Host Address Range Local Network Address Local Network Mask0.0.0.0 - 127.255.255.255 0.0.0.0 128.0.0.0128.0.0.0 - 128.255.255.255 128.0.0.0 128.0.0.0 or 255.0.0.0205.32.0.0 - 205.32.255.255 205.32.0.0 255.255.0.0
