ZyXEL ZyWALL 5 User Guide - Page 591
The Device Mode Screen
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Figure 345 Synchronization Fail Chapter 33 Maintenance Screens 33.5 The Device Mode Screen Use this screen to configure your ZyWALL as a router or a bridge. In router mode, the ZyWALL functions as a router. In bridge mode, the ZyWALL functions as a transparent firewall (also known as a bridge firewall). Introduction To Transparent Bridging A transparent bridge is invisible to the operation of a network in that it does not modify the frames it forwards. The bridge checks the source address of incoming frames on the port and learns MAC addresses to associate with that port. All future communications to that MAC address will only be sent on that port. The bridge gradually builds a host MAC-address-to-port mapping table such as in the following example, during the learning process. Table 201 MAC-address-to-port Mapping Table HOST MAC ADDRESS PORT 00a0c5123456 3 00a0c5123478 (host A) 1 00a0c512349a 3 00a0c51234bc 2 00a0c51234de 4 For example, if a bridge receives a frame via port 1 from host A (MAC address 00a0c5123478), the bridge associates host A with port 1. When the bridge receives another frame on one of its ports with destination address 00a0c5123478, it forwards the frame directly through port 1 after checking the internal table. The bridge takes one of these actions after it checks the destination address of an incoming frame with its internal table: • If the table contains an association between the destination address and any of the bridge's ports aside from the one on which the frame was received, the frame is forwarded out the associated port. ZyWALL 5/35/70 Series User's Guide 591
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