ROUTE(1M) ROUTE(1M)
NAME
route - manually manipulate the routing tables
SYNOPSIS
/usr/etc/route [ -f ] [ -n ] [ command args ]
DESCRIPTION
Route is a program used to manually manipulate the network
routing tables. It normally is not needed, as the system
routing table management daemon, routed(1M), should tend to
this task.
Route accepts two commands: add, to add a route, and
delete, to delete a route.
All commands have the following syntax:
/usr/etc/route command [ net | host ] destination gateway
[ metric ]
where destination is the destination host or network,
gateway is the next-hop gateway to which packets should be
addressed, and metric is a count indicating 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. 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 for
transmission. Routes to a particular host are distinguished
from those to a network by interpreting the Internet address
associated with destination. 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 INADDR_ANY, or if the destination
is the symbolic name of a network, 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 via a
gateway, the metric should be greater than 0. All symbolic
names specified for a destination or gateway are looked up
first as a host name using gethostbyname(3N). If this
lookup fails, getnetbyname(3N) is then used to interpret the
name as that of a network.
Route uses a raw socket and the SIOCADDRT and SIOCDELRT
ioctl's to do its work. As such, only the super-user may
modify the routing tables.
If the -f option is specified, route will ``flush'' the
routing tables of all gateway entries. If this is used in
conjunction with one of the commands described above, the
tables are flushed prior to the command's application.
Page 1 (last mod. 8/20/87)
ROUTE(1M) ROUTE(1M)
The -n option prevents attempts to print host and network
names symbolically when reporting actions.
DIAGNOSTICS
``add [ host | network ] %s: gateway %s flags %x''
The specified route is being added to the tables. The
values printed are from the routing table entry supplied in
the ioctl call. If the gateway address used was not the
primary address of the gateway (the first one returned by
gethostbyname), the gateway address is printed numerically
as well as symbolically.
``delete [ host | network ] %s: gateway %s flags %x''
As above, but when deleting an entry.
``%s %s 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. The next-hop
gateway must be given.
``not in table''
A delete operation was attempted for an entry which wasn't
present in the tables.
``routing table overflow''
An add operation was attempted, but the system was low on
resources and was unable to allocate memory to create the
new entry.
SEE ALSO
intro(7P), routed(1M)
ORIGIN
4.3 BSD
Page 2 (last mod. 8/20/87)