ADTRAN AOS Version R10.1.0 Command Reference Manual page 1629

Command Reference Guide
ip helper-address <ip address>
Use the ip helper-address command to configure 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 AOS to forward UDP broadcast packets.
Syntax Description
<ip address>
Default Values
By default, broadcast UDP packets are not forwarded.
Command History
Release 1.1
Release 5.1
Release A4.01
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 UDP.
2. Any UDP port specified using the ip forward-protocol command.
3. The medium 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).
60000CRG0-35E
Specifies the destination IP address for the forwarded UDP packets. IP
addresses should be expressed in dotted decimal notation (for example,
10.10.10.1).
Command was introduced.
Command was expanded to include the Ethernet subinterfaces.
Command was expanded to include the Metro Ethernet Forum (MEF)
Ethernet Interface.
Copyright © 2012 ADTRAN, Inc.
Ethernet Interface Command Set
1629