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Plan 9 - man page for iproute (plan9 section 3)

IPROUTE(3)			     Library Functions Manual			       IPROUTE(3)

       iproute - Internet route table manager

       bind -a #P /net


       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' > /net/iproute
	      % cat /net/iproute & ->

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


       ip(3), ipconfig(8)


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