Multiple Interfaces and Routes Post: 2992

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LEARN ABOUT PLAN9

iproute

IPROUTE(3)						     Library Functions Manual							IPROUTE(3)

NAME

       iproute - Internet route table manager

SYNOPSIS

       bind -a #P /net

       /net/iproute
       /net/ipifc

DESCRIPTION

       The  iproute  device  allows the specification of routes for families of IP addresses.  It maintains a kernel-resident routing table for IP
       addresses used by TCP, IL and UDP.  Each route consists of a destination IP address, an IP mask, and an IP gateway address.   Every  packet
       sent  by  the  system is routed according to the route table.  An address matches the route table entry when a packet's destination address
       matches the table destination address under the mask. When a match is found, the packet is sent to the gateway IP address. If there  is	no
       match,  the  packet is sent with the original destination address.  If there are several matches, the one whose mask has the fewest leading
       zeros is chosen.  (Because of the definition of IP masks, this mask preserves the largest portion of the address and is therefore the  most
       specific.)  This is forced by storing the routes in decreasing number of ones order and returning the first match.  The default gateway has
       no ones in the mask and is thus the last matched.

       Reading iproute reports the current routes entered in the table.  Writing control messages to iproute edits the table.  Route  entries  are
       made by writing a string of format

	      add ipdest mask ipgateway

       Entries are deleted by writing a string of format

	      delete ipdest mask

       The whole table can be cleared by writing the string

       For example, to install a gateway address to accept all IP packets from a machine:

	      % echo 'add 0.0.0.0 0.0.0.0 131.107.1.5' > /net/iproute
	      % cat /net/iproute
	      0.0.0.0 & 0.0.0.0 -> 131.107.1.5

       Reading	ipifc  reports	the  current  IP interfaces being used, one line per interface, showing the device, the maximum transfer unit, the
       local address, the network mask, and the network address.

SOURCE

       /sys/src/9/port/deviproute.c

SEE ALSO

       ip(3), ipconfig(8)

																	IPROUTE(3)