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75 lines
1.6 KiB
Groff
75 lines
1.6 KiB
Groff
.TH "Route classifier in tc" 8 "21 Oct 2015" "iproute2" "Linux"
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.SH NAME
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route \- route traffic control filter
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.SH SYNOPSIS
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.in +8
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.ti -8
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.BR tc " " filter " ... " route " [ " from
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.IR REALM " | "
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.B fromif
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.IR TAG " ] [ "
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.B to
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.IR REALM " ] [ "
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.B classid
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.IR CLASSID " ] [ "
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.B action
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.IR ACTION_SPEC " ]"
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.SH DESCRIPTION
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Match packets based on routing table entries. This filter centers around the
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possibility to assign a
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.B realm
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to routing table entries. For any packet to be classified by this filter, a
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routing table lookup is performed and the returned
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.B realm
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is used to decide on whether the packet is a match or not.
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.SH OPTIONS
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.TP
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.BI action " ACTION_SPEC"
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Apply an action from the generic actions framework on matching packets.
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.TP
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.BI classid " CLASSID"
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Push matching packets into the class identified by
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.IR CLASSID .
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.TP
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.BI from " REALM"
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.TQ
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.BI fromif " TAG"
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Perform source route lookups.
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.I TAG
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is the name of an interface which must be present on the system at the time of
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.B tc
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invocation.
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.TP
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.BI to " REALM"
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Match if normal (i.e., destination) routing returns the given
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.IR REALM .
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.SH EXAMPLES
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Consider the subnet 192.168.2.0/24 being attached to eth0:
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.RS
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.EX
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ip route add 192.168.2.0/24 dev eth0 realm 2
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.EE
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.RE
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The following
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.B route
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filter will then match packets from that subnet:
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.RS
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.EX
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tc filter add ... route from 2 classid 1:2
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.EE
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.RE
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and pass packets on to class 1:2.
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.SH NOTES
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Due to implementation details,
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.B realm
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values must be in a range from 0 to 255, inclusive. Alternatively, a verbose
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name defined in /etc/iproute2/rt_realms may be given instead.
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.SH SEE ALSO
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.BR tc (8),
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.BR ip-route (8)
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