Heritage Series ADSL Bridge/ Router | 95 |
Command Sets for Command Line Interface |
“<mask>” (default ff:ff:ff:00) is the subnet mask of the network being routed to, specified as four hexadecimal numbers separated by colons. For example, 0:0:0:0 is a default route (matches everything without a more specific route), ff:ff:ff:0 would match a Class C network, and ff:ff:ff:ff is a route to a single host. (Note: the default is not always sensible; in particular, if “<dest>” is 0.0.0.0 then it would be better for the mask to default to 0:0:0:0.)
“<cost>” (default 1) is the number of hops counted as the cost of the route, which may affect the choice of route when the route is competing with routes acquired from RIP. (But note that using a mixture of RIP and static routing is not advised.)
“<timeout>” (default 0, meaning that the route does not time out) is the number of seconds that the route will remain in the routing table. Note that the routing table does not contain routes to the directly connected networks, without going through a gateway. TCP/IP routes packets to such destinations by using the information in the device and subnet tables instead. The “route” command (with no parameters) displays the routing table. It adds a comment to each route with the following information:
•How the route was obtained; one of
MAN — configured by the “route” command
RIP — obtained from RIP
ICMP — obtained from an ICMP redirect message
SNMP — configured by SNMP network management;
•The
•The original
•The name of the interface (if known) that will be used for the route;
•An asterisk (“*”) if the route was added recently and RIP has not yet processed the change
(the asterisk should disappear within 30 seconds, when RIP next considers broadcasting routing information).
Configuration saving saves this information. (Only the routes configured by the “route” command are saved or displayed by “config”.)
Example:
DSL> ip route add default 0.0.0.0 192.168.2.3 0:0:0:0
DSL> ip route add testnet1 192.168.101.0 192.168.2.34
DSL> ip route add testnet2 192.168.102.0 192.168.2.34 ff:ff:ff:0 1 60
DSL> ip route
