route(1M) (TCP/IP) route(1M)
NAME
route - manually manipulate the routing tables
SYNOPSIS
route [ -fn ] { add | delete } { destination | default } [ host | net
] [ gateway [ metric ] ]
DESCRIPTION
route manually manipulates the network routing tables normally
maintained by the system routing daemon, routed(1M), or through
default routes and redirect messages from routers. route allows the
super-user to operate directly on the routing table for the specific
host or network indicated by destination. default is available for
gateways to use after all other routes have been attempted. The
gateway argument, if present, indicates the network gateway to which
packets should be addressed. The metric argument indicates the
number of hops to the destination. The metric is required for add
commands; it must be zero if the destination is on a directly-
attached network, and nonzero if the route utilizes one or more
gateways.
The add command instructs route to add a route to destination.
delete deletes a route.
Routes to a particular host must be distinguished from those to a
network. The optional keywords net and host force the destination to
be interpreted as a network or a host, respectively. Otherwise, if
the destination has a local address part of INADDRANY, then the
route is assumed to be to a network; otherwise, it is presumed to be
a route to a host. If the route is to a destination connected by a
gateway, the metric parameter should be greater than 0. If adding a
route with metric 0, the gateway given is the address of this host on
the common network, indicating the interface to be used directly for
transmission. All symbolic names specified for a destination (except
default) or gateway are looked up in the hosts database using
gethostbyname(3N). If this lookup fails, then the name is looked up
in the networks database using getnetbyname(3N).
OPTIONS
-f Flush the routing tables of all gateway entries. If this is
used in conjunction with one of the commands described above,
route flushes the gateways before preforming the command.
-n Prevents attempts to print host and network names symbolically
when reporting actions. This is useful, for example, when all
name servers are down on your local net, so you need a route
before you can contact the name server.
FILES
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route(1M) (TCP/IP) route(1M)
/etc/hosts
/etc/networks
SEE ALSO
ioctl(2), gethostbyname(3N), getnetbyname(3N), routing(4N),
routed(1M).
DIAGNOSTICS
add [ host | net ] destination:gateway
The specified route is being added to the tables. The values
printed are from the routing table entry supplied in the
ioctl(2) call.
delete [ host | net ] destination:gateway
The specified route is being deleted.
destination done
When the -f flag is specified, each routing table entry deleted
is indicated with a message of this form.
Network is unreachable
An attempt to add a route failed because the gateway listed was
not on a directly-connected network. Give the next-hop gateway
instead.
not in table
A delete operation was attempted for an entry that is not in
the table.
routing table overflow
An add operation was attempted, but the system was unable to
allocate memory to create the new entry.
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