ZyXEL UAG4100 User Guide - Page 212
Policy Routing Technical Reference
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Chapter 12 Policy and Static Routes Figure 137 Configuration > Network > Routing > Static Route > Add The following table describes the labels in this screen. Table 91 Configuration > Network > Routing > Static Route > Add LABEL Destination IP DESCRIPTION This parameter specifies the IP network address of the final destination. Routing is always based on network number. If you need to specify a route to a single host, enter the specific IP address here and use a subnet mask of 255.255.255.255 (for IPv4) in the Subnet Mask field to force the network number to be identical to the host ID. Subnet Mask Enter the IP subnet mask here. Gateway IP Select the radio button and enter the IP address of the next-hop gateway. The gateway is a router or switch on the same segment as your UAG's interface(s). The gateway helps forward packets to their destinations. Interface Select the radio button and a predefined interface through which the traffic is sent. Metric Metric represents the "cost" of transmission for routing purposes. IP routing uses hop count as the measurement of cost, with a minimum of 1 for directly connected networks. Enter a number that approximates the cost for this link. The number need not be precise, but it must be 0~127. In practice, 2 or 3 is usually a good number. OK Click OK to save your changes back to the UAG. Cancel Click Cancel to exit this screen without saving. 12.4 Policy Routing Technical Reference Here is more detailed information about some of the features you can configure in policy routing. NAT and SNAT NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address in a packet in one network to a different IP address in another network. Use SNAT (Source NAT) to change the source IP address in one network to a different IP address in another network. Assured Forwarding (AF) PHB for DiffServ Assured Forwarding (AF) behavior is defined in RFC 2597. The AF behavior group defines four AF classes. Inside each class, packets are given a high, medium or low drop precedence. The drop UAG Series User's Guide 212