Linux Bridge Utilities

Linux Bridge Utilities is a handy tool that helps connect two Ethernet segments in a way that doesn't depend on the protocol. Instead of using IP addresses like a router would, it forwards packets based on Ethernet addresses. Since this process happens at Layer 2, all types of protocols can pass through the bridge without any issues.

Understanding Linux Bridge Code

The Linux bridge code follows part of the ANSI/IEEE 802.1d standard. It first appeared in Linux version 2.2 and was later rewritten by Lennert Buytenhek. If you’re wondering about its integration, the bridging code has been included in both the 2.4 and 2.6 kernel series.

Getting Your Network Cards Ready

Before you dive in, make sure both of your network cards are set up properly and working fine. It's important not to set an IP address or let any startup scripts run DHCP on those Ethernet interfaces just yet! You'll need to assign an IP address after you’ve configured your bridge.

Check Your Network Cards Status

You can use the command ifconfig to see both network cards’ status; they should be showing as DOWN at this point.

Loading the Module

Most of the time, the bridge code comes as a module. If everything is set up right with your module, it will load automatically when you run your first brctl command. If you've built your bridge utilities correctly and your kernel along with the bridge module are good to go, typing brctl will show you a brief command synopsis.

Get Started with Linux Bridge Utilities!

This tool makes managing your network much easier!