Reference Guide

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.
S5000
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 9.0(1.3) Introduced on the S5000.
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.
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 Dell Networking
OS forwards to the client with source port=67, destination port=68.
ip helper-address hop-count disable
Disable the hop-count increment for the DHCP relay agent.
S5000
Syntax
ip helper-address hop-count disable
To re-enable the hop-count increment, use the no ip helper-address hop-
count disable
command.
IPv4 Routing
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