28 Apr 09 brctl: Creating a network bridge

Creating a layer 2 ethernet bridge under Debian (or Linux in general really) is incredibly easy, as are most things. What a L2 bridge actually is, is outside the scope of this guide, however Google has plenty of information. Essentially, ethernet frames are mirrored between the two interfaces, therefore what Layer 3 protocol data (TCP, UDP, ICMP, etc) is within the ethernet frame is irrelevant. Anyway, back to the point..

In case you don’t have the package, apt-get install bridge-utils and you’ll also need bridge support in your kernel, however unless you specifically removed it, you should have it.
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Tags: brctl, bridge, bridge-utils