Ip Helper-Address Command - ADTRAN 5000 Series Command Reference Manual

Command Reference Guide
ip helper-address <address>
Use the ip helper-address command to configure the AOS to forward User Datagram Protocol (UDP)
broadcast packets received on the interface. Use the no form of this command to disable forwarding
packets.
The ip helper-address command must be used in conjunction with the ip forward-protocol
command to configure the AOS to forward UDP broadcast packets.
Syntax Description
<address>
Default Values
By default, broadcast UDP packets are not forwarded.
Applicable Platforms
This command applies to the NetVanta 300, 2000, 3000, 4000, and 5000 and Total Access 900 Series
units.
Command History
Release 1.1
Release 5.1
Functional Notes
When used in conjunction with the ip forward-protocol command, the ip helper-address feature allows
you to customize which broadcast packets are forwarded.
To implement the helper address feature, assign helper address(es) (specifying the device that needs to
receive the broadcast traffic) to the interface closest to the host that transmits the broadcast packets.
When broadcast packets (of the specified type forwarded using the ip forward-protocol command) are
received on the interface, they will be forwarded to the device that needs the information.
Only packets meeting the following criteria are considered eligible by the ip helper-address feature:
1. The packet IP protocol is User Datagram Protocol (UDP).
2. Any UDP port specified using the ip forward-protocol command.
3. The media access control (MAC) address of the frame is an all-ones broadcast address (ffff.ffff.ffff).
4. The destination IP address is broadcast defined by all ones (255.255.255.255) or a subnet broadcast
(for example, 192.33.4.251 for the 192.33.4.248/30 subnet).
61200990L1-35E
Specifies the destination IP address (in dotted decimal notation) for the forwarded
UDP packets
Command was introduced.
Command was expanded to include Ethernet sub-interfaces.
Copyright © 2005 ADTRAN
Ethernet Interface Configuration Command Set
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