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-.\"
-.\"     $Id$
-.\"
-.Dd Sep 28, 1998
-.Dt BRIDGE 4
-.Os
-.Sh NAME
-.Nm bridge
-.Nd Bridging support
-.Sh DESCRIPTION
-Starting from version 2.2.8, FreeBSD supports bridging on ethernet-type
-interfaces. This is achieved using the following option
-.Bd -literal
-    options BRIDGE
-.Ed
-
-in the kernel config file, and is controlled by two
-.Nm sysctl
-variables:
-.Bd -literal
-    net.link.ether.bridge
-.Ed
-
-Set to 1 to enable bridging, set to 0 to disable it
-.Bd -literal
-    net.link.ether.bridge_ipfw
-.Ed
-
-Set to 1 to enable
-.Nm ipfw
-filtering on bridged packets. Note that
-.Nm ipfw
-rules only apply
-to IP packets. Non-IP packets are subject to the default
-.Nm ipfw
-rule (number 65535) which must be an
-.Ar allow
-rule if we want ARP and other non-IP packets to flow through the
-bridge.
-
-
-.Sh BUGS
-.Pp
-Care must be taken not to construct loops in the bridge topology.
-The kernel supports only a primitive form of loop detection, by disabling
-some interfaces when a loop is detected. No support for a daemon running the
-spanning tree algorithm is currently provided.
-.Pp
-With bridging active, interfaces are in promiscuous mode,
-thus causing some load on the system to receive and filter
-out undesired traffic.
-.Pp
-Extended functionality to enable bridging selectively on clusters
-of interfaces is still in the works.
-.Pp
-Not all interface support bridging -- at the moment it works for
-``ed'', ``de'', ``ep'', ``fxp'', ``lnc'' interfaces.
-.Sh SEE ALSO
-.Xr ip 4 ,
-.Xr ipfw 8 ,
-.Xr sysctl 8 .
-.Sh HISTORY
-.Nm
-bridging has been introduced in FreeBSD 2.2.8
-by Luigi Rizzo <luigi@iet.unipi.it>.