User`s guide

Dual Network Options
Chapter 17 Command Line Interface 279
Ethernet Bridging
Ethernet bridging is commonly used to connect different networks of
Ethernets together, so that these Ethernets will appear as one Ethernet to
the participants. Ethernet bridging essentially involves combining an
Ethernet interface with one or more physical Ethernet interfaces and
bridging them together under the umbrella of a single bridge interface.
Ethernet bridges represent the software analog to a physical Ethernet
switch. The Ethernet bridge can be thought of as a kind of software switch
which can be used to connect multiple Ethernet interfaces (either physical
or virtual) on a single machine while sharing a single IP subnet.
In the Passport, a script file, brmode (/etc/init.d/brmode), can be used to
enable/disable the Ethernet bridging. (Ethernet Bridging is supported only
through CLI command. There is no option in UI.)
To enable the Ethernet Bridging, run following command in the CLI.
# service brmode start
Then, the IP address of the eth0 interface will be the common IP address
for the bridging mode interface(br0).
After enabling Ethernet Bridging, eth0 and eth1 address will disappear.
Note that there will be a delay of a few minutes for changing the physical
interface from Ethernet 1 port to Ethernet 2 port automatically by the
bridging function. And also please note that eth1 (IP address #2) interface
should be enabled first before start bridging.
To disable the Ethernet Bridging, run following command in the CLI.
# service brmode stop
To customize the bridging configuration, modify /etc/init.d/brmode and
refer to Linux manual page regarding brctl for detailed configuration
options.
Run the following command to remove following message on the serial
console:
# brctl setageing br0 0