Multinetting - Nortel Contivity 1100 Configuration Manual

38 Chapter 2 Getting started
7

Multinetting

IP multinetting allows a maximum of eight addresses to be configured on a single
Ethernet interface. The first IP address configured on the interface is the primary
address. Subsequent IP addresses are secondary addresses, or subnets. All the
subnets on a physical interface share the security rules configured for the primary
subnet. You can configure only one set of Interface Filter rules per physical
interface.
Multinetting is commonly used in IP networks as part of a transition strategy. As
networks evolve, consolidation of several physical networks is often necessary. To
avoid re-addressing, the physical networks are consolidated onto a multinetted
Nortel VPN Router interface. Multinetting allows hosts to migrate to the new IP
interface or maintain the previous IP address. You can add Multinet IP addresses
to the private side or the public side of the VPN Router .
Statistics and logging are done at the interface level and in most cases are not
available separately for each secondary address on the interface.
Overall throughput using multinetting, instead of a non-multinetting application,
has no significant degradation. There is also no degradation of forwarding
performance.
NN46110-500
Type E and press Enter to save the settings and exit. You can then manage the
Nortel VPN Router from a Web browser.
Note: It is very important that broadcast packets originated by the router
not use the local subnet broadcast. Whenever multiple Routing
Information Protocol (RIP) interfaces are created on the same physical
interface of a router, all of those interfaces MUST be configured with an
explicit broadcast address of 255.255.255.255 in order to avoid routing
loops.