IP-RULE(8)							       Linux								IP-RULE(8)

NAME

       ip-rule - routing policy database management

SYNOPSIS

       ip [ OPTIONS ] rule { COMMAND | help }

       ip rule [ list [ SELECTOR ]]

       ip rule { add | del } SELECTOR ACTION

       ip rule { flush | save | restore }

       SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ] [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [
	       l3mdev ]

       ACTION := [ table TABLE_ID ] [ nat ADDRESS ] [ realms [SRCREALM/]DSTREALM ] [ goto NUMBER ] SUPPRESSOR

       SUPPRESSOR := [ suppress_prefixlength NUMBER ] [ suppress_ifgroup GROUP ]

       TABLE_ID := [ local | main | default | NUMBER ]

DESCRIPTION

       ip rule manipulates rules in the routing policy database control the route selection algorithm.

       Classic routing algorithms used in the Internet make routing decisions based only on the destination address of packets (and in theory, but
       not in practice, on the TOS field).

       In some circumstances we want to route packets differently depending not only on destination addresses, but also on other packet fields:
       source address, IP protocol, transport protocol ports or even packet payload.  This task is called 'policy routing'.

       To solve this task, the conventional destination based routing table, ordered according to the longest match rule, is replaced with a
       'routing policy database' (or RPDB), which selects routes by executing some set of rules.

       Each policy routing rule consists of a selector and an action predicate.  The RPDB is scanned in order of decreasing priority (note that
       lower number means higher priority, see the description of PREFERENCE below). The selector of each rule is applied to {source address, des-
       tination address, incoming interface, tos, fwmark} and, if the selector matches the packet, the action is performed. The action predicate
       may return with success.  In this case, it will either give a route or failure indication and the RPDB lookup is terminated. Otherwise, the
       RPDB program continues with the next rule.

       Semantically, the natural action is to select the nexthop and the output device.

       At startup time the kernel configures the default RPDB consisting of three rules:

       1.     Priority: 0, Selector: match anything, Action: lookup routing table local (ID 255).  The local table is a special routing table con-
	      taining high priority control routes for local and broadcast addresses.

       2.     Priority: 32766, Selector: match anything, Action: lookup routing table main (ID 254).  The main table is the normal routing table
	      containing all non-policy routes. This rule may be deleted and/or overridden with other ones by the administrator.

       3.     Priority: 32767, Selector: match anything, Action: lookup routing table default (ID 253).  The default table is empty. It is
	      reserved for some post-processing if no previous default rules selected the packet.  This rule may also be deleted.

       Each RPDB entry has additional attributes. F.e. each rule has a pointer to some routing table. NAT and masquerading rules have an attribute
       to select new IP address to translate/masquerade. Besides that, rules have some optional attributes, which routes have, namely realms.
       These values do not override those contained in the routing tables. They are only used if the route did not select any attributes.

       The RPDB may contain rules of the following types:

	      unicast - the rule prescribes to return the route found in the routing table referenced by the rule.

	      blackhole - the rule prescribes to silently drop the packet.

	      unreachable - the rule prescribes to generate a 'Network is unreachable' error.

	      prohibit - the rule prescribes to generate 'Communication is administratively prohibited' error.

	      nat - the rule prescribes to translate the source address of the IP packet into some other value.

       ip rule add - insert a new rule

       ip rule delete - delete a rule

	      type TYPE (default)
		     the type of this rule. The list of valid types was given in the previous subsection.

	      from PREFIX
		     select the source prefix to match.

	      to PREFIX
		     select the destination prefix to match.

	      iif NAME
		     select the incoming device to match. If the interface is loopback, the rule only matches packets originating from this host.
		     This means that you may create separate routing tables for forwarded and local packets and, hence, completely segregate them.

	      oif NAME
		     select the outgoing device to match. The outgoing interface is only available for packets originating from local sockets that
		     are bound to a device.

	      tos TOS

	      dsfield TOS
		     select the TOS value to match.

	      fwmark MARK
		     select the fwmark value to match.

	      priority PREFERENCE
		     the priority of this rule.  PREFERENCE is an unsigned integer value, higher number means lower priority, and rules get pro-
		     cessed in order of increasing number. Each rule should have an explicitly set unique priority value.  The options preference
		     and order are synonyms with priority.

	      table TABLEID
		     the routing table identifier to lookup if the rule selector matches.  It is also possible to use lookup instead of table.

	      suppress_prefixlength NUMBER
		     reject routing decisions that have a prefix length of NUMBER or less.

	      suppress_ifgroup GROUP
		     reject routing decisions that use a device belonging to the interface group GROUP.

	      realms FROM/TO
		     Realms to select if the rule matched and the routing table lookup succeeded. Realm TO is only used if the route did not
		     select any realm.

	      nat ADDRESS
		     The base of the IP address block to translate (for source addresses).  The ADDRESS may be either the start of the block of
		     NAT addresses (selected by NAT routes) or a local host address (or even zero).  In the last case the router does not trans-
		     late the packets, but masquerades them to this address.  Using map-to instead of nat means the same thing.

		     Warning: Changes to the RPDB made with these commands do not become active immediately. It is assumed that after a script
		     finishes a batch of updates, it flushes the routing cache with ip route flush cache.

       ip rule flush - also dumps all the deleted rules.
	      This command has no arguments.

       ip rule show - list rules
	      This command has no arguments.  The options list or lst are synonyms with show.

       ip rule save
	      save rules table information to stdout
	      This command behaves like ip rule show except that the output is raw data suitable for passing to ip rule restore.

       ip rule restore
	      restore rules table information from stdin
	      This command expects to read a data stream as returned from ip rule save.  It will attempt to restore the rules table information
	      exactly as it was at the time of the save. Any rules already in the table are left unchanged, and duplicates are not ignored.

SEE ALSO

       ip(8)

AUTHOR

       Original Manpage by Michail Litvak <mci@owl.openwall.com>

iproute2							    20 Dec 2011 							IP-RULE(8)