
Configuring IP Services
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Configuring the Router for Host-Only Mode
By default, IP forwards all packets that are not addressed to itself. You can also
configure IP in nonforwarding -- or host-only -- mode.
Use the forwarding mode if you want the IP router to route (forward) IP traffic.
Forwarding configures the IP router to process all broadcast packets and all IP
packets explicitly addressed to it, and to route all other IP packets.
Select nonforwarding mode on the router if you want to provide IP management
access (by means of TFTP and SNMP) to all active IP interfaces but also want to
prohibit the IP router from forwarding IP traffic. You must specify an identical IP
address and mask combination for each active IP interface that will provide
management access. Nonforwarding mode configures the IP router to act as an IP
host; it does not forward IP traffic, but it still processes packets explicitly
addressed to it. In Not Forwarding mode, only static routes and adjacent-host
routes are allowed. No routing protocols are initiated.
Because the IP router does not forward IP traffic in Not Forwarding mode, you
must configure the router to bridge IP traffic not explicitly addressed to it. You
must configure the bridge for each circuit that conveys IP datagrams. The bridge
will then forward all IP datagrams that are not explicitly addressed to the router.
You can use Site Manager to select nonforwarding (host-only) mode.
Table 3-1 and Table 3-2 show valid and invalid configurations for source route
bridges and learning bridges. Each configuration is expressed as
source device > medium > destination device
For example:
Bay > Eth > Bay
source device is a Bay Networks router, the medium is Ethernet, and the
destination device is a Bay Networks router.
Site Manager: Forwarding parameter: page A-39
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