bridge man page on Plan9

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BRIDGE(3)							     BRIDGE(3)

       bridge - Ethernet bridge and IPv4 tunnel

       bind -a #Bb /net

       The bridge device bridges (copies) packets amongst Ethernet interfaces.
       The number b in the bind is optional and selects	 a  particular	bridge
       (default 0).

       The  /net/bridge0  directory contains ctl, cache, log, and stats files,
       and numbered subdirectories for each physical interface.

       Opening the ctl	file  reserves	an  interface.	 The  file  descriptor
       returned	 from  the open(2) will point to the control file, ctl, of the
       newly allocated interface.  Reading ctl returns a  text	string	repre‐
       senting the number of the interface.  Writing ctl alters aspects of the
       interface.  The possible ctl messages are:

       bind ether name ownhash path
	      Treat the device mounted at path (e.g., as  an  Ethernet	medium
	      and  associate  it  with this bridge (forward its packets to the
	      other interfaces associated with this bridge).   Ownhash	is  an
	      `owner hash'.

       bind tunnel name ownhash path path2
	      Treat the device mounted at path as a network tunnel (of IPv4 in
	      IPv4), the device mounted at path2 as an Ethernet medium and as‐
	      sociate  them with this bridge (forward its packets to the other
	      interfaces associated with this bridge).	Read packets from  the
	      path interface and write them to the path2 interface.  Such tun‐
	      nels have an MTU of 1400 bytes.

       unbind type address [ownhash]
	      Disassociate the interface associated  with  address  from  this
	      bridge.  Type must be or

	      Clear the cache of (destination MAC address, port) tuples.

       delay delay0 delayn
	      Set  the	delay0	and delayn parameters.	delay0 is the constant
	      microsecond delay per packet and delayn is the microsecond delay
	      per byte.

       set option
	      Set  bridge  option.   The only known option is which limits the
	      TCP Maximum Segment Size of TCP packets passing through to  1300

       clear option
	      Clear bridge option.

       Reading stats returns statistics about the bridge.

       Reading	the log file returns data from the bridge's log and will block
       at end of file awaiting new data.

       Reading the cache file prints the cache of  (destination	 MAC  address,
       port)  tuples,  one entry per line.  The format is: the destination MAC
       (e.g., Ethernet) address in hex, port number,  count  of	 packets  from
       this  address, count of packets to this address, expiry time in seconds
       since the epoch, and for expired entries or for valid entries.

       In a connection subdirectory, ctl and local don't do anything, but sta‐
       tus returns a one-line status summary.

       Set up a network bridge between two Ethernets and

	      bind -a '#B' /net
	      bind -a '#l1' /net
	      echo 'bind ether outer 0 /net/ether0' >/net/bridge0/ctl
	      echo 'bind ether inner 0 /net/ether1' >/net/bridge0/ctl



       Understands but won't tunnel nor fragment IPv6.

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