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Document the alternate way of matching MAC addresses: by a bitmask.

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PR:		56021
Submitted by:	Glen Gibb <grg@ridley.unimelb.edu.au>
MFC after:	1 month
This commit is contained in:
Peter Pentchev 2003-09-10 06:41:16 +00:00
parent 42a12b2bd8
commit 94679655fd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=119947
1 changed files with 22 additions and 2 deletions
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sbin/ipfw/ipfw.8
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@ -1046,11 +1046,31 @@ addresses, specified as the
.Cm any
keyword (matching any MAC address), or six groups of hex digits
separated by colons,
and optionally followed by a mask indicating how many bits are
significant, as in
and optionally followed by a mask indicating the significant bits.
The mask may be specified using either of the following methods:
.Bl -enum -width indent
.It
A slash
.Pq /
followed by the number of significant bits.
For example, an address with 33 significant bits could be specified as:
.Pp
.Dl "MAC 10:20:30:40:50:60/33 any"
.Pp
.It
An ampersand
.Pq &
followed by a bitmask specified as six groups of hex digits separated
by colons.
For example, an address in which the last 16 bits are significant could
be specified as:
.Pp
.Dl "MAC 10:20:30:40:50:60&00:00:00:00:ff:ff any"
.Pp
Note that the ampersand character has a special meaning in many shells
and should generally be escaped.
.Pp
.El
Note that the order of MAC addresses (destination first,
source second) is
the same as on the wire, but the opposite of the one used for