Documentation/networking/bridge.txt

   1 In order to use the Ethernet bridging functionality, you'll need the
   2 userspace tools. These programs and documentation are available
   3 at http://www.linuxfoundation.org/en/Net:Bridge.  The download page is
   4 http://prdownloads.sourceforge.net/bridge.
   5
   6 If you still have questions, don't hesitate to post to the mailing list
   7 (more info https://lists.linux-foundation.org/mailman/listinfo/bridge).
   8