Chapter 11 Interfaces

If computer B responds to computer A, bridge X records the source address 0B:0B:0B:0B:0B:0B and port 4 in the table. It also looks up 0A:0A:0A:0A:0A:0A in the table and sends the packet to port 2 accordingly.

Table 65 Example: Bridge Table After Computer B Responds to Computer A

MAC ADDRESS

PORT

0A:0A:0A:0A:0A:0A

2

0B:0B:0B:0B:0B:0B

4

Bridge Interface Overview

A bridge interface creates a software bridge between the members of the bridge interface. It also becomes the ZyWALL’s interface for the resulting network.

Unlike the device-wide bridge mode in ZyNOS-based ZyWALLs, this ZyWALL can bridge traffic between some interfaces while it routes traffic for other interfaces. The bridge interfaces also support more functions, like interface bandwidth parameters, DHCP settings, and connectivity check. To use the whole ZyWALL as a transparent bridge, add all of the ZyWALL’s interfaces to a bridge interface.

A bridge interface may consist of the following members:

•Zero or one VLAN interfaces (and any associated virtual VLAN interfaces)

•Any number of Ethernet interfaces (and any associated virtual Ethernet interfaces)

When you create a bridge interface, the ZyWALL removes the members’ entries from the routing table and adds the bridge interface’s entries to the routing table. For example, this table shows the routing table before and after you create bridge interface br0 (250.250.250.0/23) between lan1 and vlan1.

Table 66 Example: Routing Table Before and After Bridge Interface br0 Is Created

IP ADDRESS(ES)

DESTINATION

210.210.210.0/24

lan1

 

 

210.211.1.0/24

lan1:1

 

 

221.221.221.0/24

vlan0

 

 

222.222.222.0/24

vlan1

 

 

230.230.230.192/26

wan2

 

 

241.241.241.241/32

dmz

 

 

242.242.242.242/32

dmz

 

 

IP ADDRESS(ES)

DESTINATION

221.221.221.0/24

vlan0

 

 

230.230.230.192/26

wan2

 

 

241.241.241.241/32

dmz

 

 

242.242.242.242/32

dmz

 

 

250.250.250.0/23

br0

 

 

In this example, virtual Ethernet interface lan1:1 is also removed from the routing table when lan1 is added to br0. Virtual interfaces are automatically added to or remove from a bridge interface when the underlying interface is added or removed.

 

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ZyWALL USG 50 User’s Guide