Administrator 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 Configured Source IP Address in ICMP Messages

• Configuring 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

• Configuring ARP Retries

• ICMP

• UDP Helper

• Configurations 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 configure one network with different 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.

IPv4 Routing 448