- Enterasys Security Router User's Guide

XSR User’s Guide 5-1

Configuring IP

Overview

This document describes the XSR’s IP protocol suite functionality including:

• General IP features (ARP, ICMP, TCP, UDP, TFTP, Telnet, SSH, NAT, VRRP, Proxy DNS, et

al.)

• IP routing (RIP, OSPF, static routing, triggered-on-demand RIP updates)

•VLAN routing

•Applicable MIBs

• Configuration examples

IP protocol, the main protocol of the TCP/IP suite, interconnects systems of packet-switched

computer communication networks. It transmits TCP, UDP, and ICMP information as IP

datagrams in a 32-bit addressing scheme where an IP address is represented by four fields, each

containing 8-bit numbers. IP uses three types and five classes of addresses:

• Unicast - destined for a single host

• Broadcast - destined for all hosts on a given network

• Multicast - destined for a set of hosts belonging to a multicast group

• Class A, B, and C - used as a pool for unicast addresses

• Class D - used for multicast addresses

• Class E - reserved for future use

General IP Features

The following features are supported on the XSR:

• Meets requirements for IPv4 routers - RFC-1812

• Ethernet 802.3 support of SNAP and DIX frame format

• Internet Standard Subnetting Procedure (ISSP) - RFC-950

• ARP - dynamic, static, and proxy ARP

•Proxy DNS

• IP subnet zero (always enabled)