Command Line Reference Guide

Usage
Information
You can only configure one domain name with the ip domain-name command.
To configure more than one domain name, configure 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 — configures 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 configured.
Command
Modes
INTERFACE
Command
History
Version 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 defined, an incoming request is
sent simultaneously to all configured 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.
626
IPv4 Routing