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v Case 1 – If router AY has an interface of 192.10.2.1, a metric of 1, and a
NOFORWARD parameter of 192.50.21.0, then none of the hosts in the networks
reach network A.
v Case 2 – If router WZ has an interface of 192.10.3.1, a metric of 1, and a
NOFORWARD parameter of 192.10.4.0, then none of the IP packets go through
router WZ to get to network W. IP packets can still reach network W, however,
because router WY provides a route to that network.
Note: If you set the parameter option of any interface to Passive, then no routing
takes place across the interface.
RIP_INTERFACE Statement
Use the RIP_INTERFACE statement to specify all of the routing options that you
configure on a per-interface basis. The RIP_INTERFACE statement now contains
the functionality for defining routes and creating static routes. Prior to Version 4
Release 2, this functionality existed in the NET statement and HOST statement.
You can specify multiple interface options on a single entry in the configuration file.
You can accomplish this only if one of those options that requires a destination
address appears on a given statement. Options include the following: block,
forward, forward.cond, and noforward. For example, a statement can use the
forward and metric options on a single line. However, the forward and noforward
options cannot appear on the same line. It is recommended that only one option
appear on a given line. It is also recommended that you use multiple lines to
specify multiple options for a given interface.
You can specify interfaces on the AS/400 system in the following methods:
Network
Specified as an IP address and either a
mask
or an IP address and
bit number
.
The bit number
n
indicates which bit in the0–nbits of the IP address
(counting left to right) is the last bit of the IP address’ network portion. If the
MASK and bit number are missing, the system calculates a network by using
the subnet mask of the interface specified through the ADDTCPIFC command.
Interface name
Logical Interface name that identifies a PPP interface with an IP address that is
assigned dynamically when the PPP connection becomes active.
Hostname
The Host name of the AS/400 system, which is resolvable through DNS.
Figure 238. RouteD Configuration Scenario
394 OS/400 TCP/IP Configuration and Reference V4R4