Deployment Guide

IPv4 Routing

The Dell Networking OS supports various IP addressing features.

This chapter describes the basics of domain name service (DNS), address resolution protocol (ARP), and routing principles and their

implementation in the Dell Networking operating system (OS).

IP Feature Default

DNS Disabled

Directed Broadcast Disabled

Proxy ARP Enabled

ICMP Unreachable Disabled

ICMP Redirect Disabled

Topics:

• IP Addresses

• IPv4 Path MTU Discovery Overview

• Using the Congured Source IP Address in ICMP Messages

• Conguring the Duration to Establish a TCP Connection

• Enabling Directed Broadcast

• Resolution of Host Names

• ARP

• ARP Learning via Gratuitous ARP

• ARP Learning via ARP Request

• Conguring ARP Retries

• ICMP

• UDP Helper

• Congurations Using UDP Helper

• Troubleshooting UDP Helper

IP Addresses

The Dell Networking OS supports IP version 4, as described in RFC 791. It also supports classful routing and variable length subnet masks

(VLSM).

With VLSM, you can congure one network with dierent masks. Supernetting, which increases the number of subnets, is also supported.

To subnet, you add a mask to the IP address to separate the network and host portions of the IP address.

At its most basic level, an IP address is 32-bits composed of network and host portions and represented in dotted decimal format. For

example, 00001010110101100101011110000011 is represented as 10.214.87.131.

For more information about IP addressing, refer to RFC 791, Internet Protocol.

388 IPv4 Routing