Panasonic NN46240-501 - Manual (Page 39)

Nortel Secure Router 8000 Series
Configuration Guide - Basic Configuration 1 Product overview
Flexible IP address configuration
The Secure Router 8000 Series provides rich applications based on IP address:
• Support for multiple secondary IP addresses: Each interface can be configured with a
primary IP address and several subordinate IP addresses to connect to different subnets.
This improves networking e^iciency.
• IP address-negotiable: Users who access the Internet through an Internet service provider
(ISP) are usually allocated addresses by a remote server. This requires the interface to be
encapsulated with PPP and configured as IP address-negotiable so that it can accept the
IP addresses allocated by the peer end through PPP negotiation.
• IP unnumbered: To enable an interface that is not configured with an address to operate
normally, you can borrow the IP address of another interface.
Address Resolution Protocol functions
The Secure Router 8000 Series supports dynamic and static Address Resolution Protocol
(ARP) functions.
Under special circumstances (for example, if some fixed IP addresses are available on the
LAN gateway), you can use the static ARP function to bind these IP addresses to a specified
network interface card. This ensures that the packets heading for these addresses are
forwarded by the gateway. If you need to filter illegal IP addresses, you can configure the
static ARP table manually.
DHCP relay
Standard Dynamic Host Configuration Protocol (DHCP) is applicable in cases where the
DHCP client and server lie on the same subnet. To provide dynamic host configuration for
clients on different subnets, you must configure a DHCP server for every subnet. This
approach is not economical.
The Secure Router 8000 Series uses the DHCP relay function to complete the following tasks:
• provide relay service for DHCP clients and servers across di^erent subnets
• transmit DHCP packets to the destination DHCP server (or client) crossing the subnet
relay, so the DHCP clients of di^erent subnets can share one DHCP server and, therefore,
centralized management of client information.
Policy-based routing
Policy-based routing is a route selection mechanism that is based on a customized policy. The
Secure Router 8000 Series supports routing based on input packet information such as source
address and address length.
Multicast packets are usually forwarded according to the routing table; however, with
policy-based routing, you can forward multicasting packets according to a customized policy
for multicast traffic.
1.3.8 Unicast routing protocols
In terms of routing protocols, the Secure Router 8000 Series supports the following:
• static routing and dynamic routing protocols such as RIP, OSPF, IS-IS, and BGP
• centralized management of the routes discovered by these protocols
Issue 5.3 (30 March 2009) Nortel Networks Inc. 1-13