Service Manual

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
Command History
This guide is platform-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.0.2.0 Introduced on the S6000.
9.0.0.0 Added support for IPv6.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series ExaScale.
7.9.1.0 Introduced VRF on the E-Series.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.1 Introduced on the E-Series.
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.
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.
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IPv4 Routing