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Document 'tablearg' keyword.

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Wording by:	emaste
This commit is contained in:
Gleb Smirnoff 2006-01-13 15:48:38 +00:00
parent fa1d87f552
commit 331655f15e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=154300
1 changed files with 31 additions and 1 deletions
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32
sbin/ipfw/ipfw.8
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@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 13, 2005
.Dd January 16, 2006
.Dt IPFW 8
.Os
.Sh NAME
@ -1524,6 +1524,19 @@ the routing table (see
.Xr route 4 ) .
.Pp
Lookup tables currently support IPv4 addresses only.
.Pp
The
.Cm tablearg
feature provides the ability to use a value, looked up in the table, as
the argument for a rule action.
This can significantly reduce number of rules in some configurations.
The
.Cm tablearg
argument can be used with the following actions:
.Cm pipe , queue, divert, tee, netgraph, ngtee .
See the
.Sx EXAMPLES
Section for example usage of tables and the tablearg keyword.
.Sh SETS OF RULES
Each rule belongs to one of 32 different
.Em sets
@ -2426,6 +2439,23 @@ on a net with per-host limits, rather than per-network limits:
.Dl "ipfw add pipe 2 ip from any to 192.168.2.0/24 in"
.Dl "ipfw pipe 1 config mask src-ip 0x000000ff bw 200Kbit/s queue 20Kbytes"
.Dl "ipfw pipe 2 config mask dst-ip 0x000000ff bw 200Kbit/s queue 20Kbytes"
.Ss LOOKUP TABLES
In the following example, we need to create several traffic bandwidth
classes and we need different hosts/networks to fall into different classes.
We create one pipe for each class and configure them accordingly.
Then we create a single table and fill it with IP subnets and addresses.
For each subnet/host we set the argument equal to the number of the pipe
that it should use.
Then we classify traffic using a single rule:
.Pp
.Dl "ipfw pipe 1 config bw 1000Kbyte/s"
.Dl "ipfw pipe 4 config bw 4000Kbyte/s"
.Dl "..."
.Dl "ipfw table 1 add 192.168.2.0/24 1"
.Dl "ipfw table 1 add 192.168.0.0/27 4"
.Dl "ipfw table 1 add 192.168.0.2 1"
.Dl "..."
.Dl "ipfw pipe tablearg ip from table(1) to any"
.Ss SETS OF RULES
To add a set of rules atomically, e.g.\& set 18:
.Pp