Deployment Guide

Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
You can only congure one domain name with the ip domain-name command. To congure more than one
domain name, congure the ip domain-list command up to six times.
To enable dynamic resolution of hosts, use the following steps:
• specify a domain name server with the ip name-server command
• enable DNS with the ip domain-lookup command
To view current bindings, use the show hosts command.
Related Commands
ip domain-list — congures additional names.
ip helper-address
Specify the address of a DHCP server so that DHCP broadcast messages can be forwarded when the DHCP server is not on the same
subnet as the client.
Syntax
ip helper-address ip-address
To remove a DHCP server address, use the no ip helper-address command.
Parameters
ip-address Enter an IP address in dotted decimal format (A.B.C.D).
Defaults Not congured.
Command Modes INTERFACE
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
You can add multiple DHCP servers by entering the ip helper-address command multiple times. If multiple
servers are dened, an incoming request is sent simultaneously to all congured servers and the reply is forwarded
to the DHCP client.
The Dell Networking OS uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay
services. It listens on port 67 and if it receives a broadcast, the software converts it to unicast, and forwards to it
to the DHCP-server with source port=68 and destination port=67.
The server replies with source port=67, destination port=67 and the system forwards to the client with source
port=67, destination port=68.
604 IPv4 Routing