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2. Required software

This software setup is needed on the ethernet bridge computer. According to our Testing grounds.

2.1 Featured Linux kernel

As of kernel version 2.4.18 there's already support for the Ethernet Bridge capability built-in. No patches needed so far.
But if we intend to use netfilter capabilities, because we want to run iptables on our new Linux router/fw box, we still need to apply a patch. Any patches needed can be found and downloaded on the sourceforge Ethernet Bridge homepage.

root@bridge:~> cd /usr/src/
root@bridge:~> wget -c http://bridge.sourceforge.net/devel/bridge-nf/bridge-nf-0.0.7-against-2.4.18.diff
root@bridge:~> cd /usr/src/linux/
root@bridge:~> patch -p1 -i ../bridge-nf/bridge-nf-0.0.7-against-2.4.18.diff
        

Supposedly we want netfilter support on our bridge interface and we have already patched the vanillal kernel we may now activate some necessary kernel configuration items. On how to build a private kernel image see the CD-Net-Install-HOWTO, Toolbox. Oh, yeah, it's still in German only. Hm, I have to fix this some time..

Nevertheless, we start by now: In

        Code maturity level options
        

        [*] Prompt for development and/or incomplete code/drivers
        

        Loadable module support
        

        [*] Enable loadable module support  
        [*]   Set version information on all module symbols
        [*]   Kernel module loader
        

        Networking options
        

        [*] Network packet filtering (replaces ipchains)
        [*]   Network packet filtering debugging
        

          IP: Netfilter Configuration  --->
        

        <M> 802.1d Ethernet Bridging
        

        [*]   netfilter (firewalling) support
        

Note:

The above entry is available only if we successfully patched our kernel!

Finally, we just need a successful

root@bridge:~> make dep clean bzImage modules modules_install
        

root@bridge:~> lilo -t
root@bridge:~> lilo
root@bridge:~> reboot
        

Hint:

Perhaps we might mark our new kernel as the bridge kernel? We vi the toplevel Makefile in our kernel sources and edit the head line called EXTRAVERSION =. We may actually set it to, say bridge? ;-)
After the modules_install we find the fresh modules in /lib/modules/2.4.18bridge

2.2 Userspace tool: brctl

Once our kernel has the capabilities needed to perform Ethernet Bridge and netfilter actions, we prepare the user space tool brctl. brctl is the configuration tool we use to set up anything to suit our needs.

We download the source tarball, unpack it and change directory into it.

root@bridge:~> wget -c http://bridge.sourceforge.net/bridge-utils/bridge-utils-0.9.5.tar.gz
root@bridge:~> tar xvzf bridge-utils-0.9.5.tar.gz
root@bridge:~> cd bridge-utils-0.9.5
        

root@bridge:~> make
root@bridge:~> cp -vi brctl/brctl /sbin/
        

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