Plan 9 - man page for iproute (plan9 section 3)
|Linux & Unix Commands - Search Man Pages
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 0.0.0.0 0.0.0.0 18.104.22.168' > /net/iproute
% cat /net/iproute
0.0.0.0 & 0.0.0.0 -> 22.214.171.124
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
All times are GMT -4. The time now is 03:47 PM.