HP 7000 dl Router Series User's Guide Page 826
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SROS Command Line Interface Reference Guide HDLC Command Set
5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 826
ip helper-address <address>
Use the ip helper-address command to configure the SROS to forward User Datagram Protocol (UDP)
broadcast packets received on the interface. Use the no form of this command to disable forwarding
packets.
Syntax Description
<address> Specifies the destination IP address (in dotted decimal notation) for the forwarded
UDP packets.
Default Values
By default, broadcast UDP packets are not forwarded.
Command Modes
(config-interface)# Interface Configuration Mode
Valid interfaces include: Ethernet (eth 0/1), virtual PPP interfaces (ppp 1), virtual
HDLC interfaces (hdlc 1), virtual Frame Relay sub-interfaces (fr 1.20), tunnel
interfaces (tunnel 1), and VLAN interface (vlan 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 a 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).
The ip helper command must be used in conjunction with the ip forward-protocol
command to configure the SROS to forward UDP broadcast packets.
- SROS Command Line Interface 1
- Publication Number 2
- Applicable Products 2
- Disclaimer 2
- Warranty 2
- Table of Contents 3
- REFERENCE GUIDE INTRODUCTION 4
- CLI INTRODUCTION 4
- Using CLI Shortcuts 6
- BASIC MODE COMMAND SET 10
- Functional Notes 13
- ENABLE MODE COMMAND SET 20
- Syntax Description 100
- Default Values 100
- Command Modes 100
- Usage Examples 100
- >enable 129
- Technology Review 139
- [detail] 157
- <subnet>] 164
- 12 65520 3 0 30 174
- 13 131056 0 0 0 174
- <interface id>] 182
- No subcommands 186
- > show sntp 186
- Technology Review (Continued) 207
- <backup filename>] 213
- Functional Notes (Continued) 272
- Enabled? 275
- OS Firewall Response Common 275
- <listname> 335
- <trap type> 339
- DHCP POOL COMMAND SET 355
- IKE POLICY COMMAND SET 373
- OLICY ATTRIBUTES COMMAND SET 386
- IKE CLIENT COMMAND SET 392
- CRYPTO MAP IKE COMMAND SET 396
- CRYPTO MAP MANUAL COMMAND SET 405
- RADIUS GROUP COMMAND SET 416
- <password>] 475
- T1 Network Interface 511
- Default Values (Continued) 620
- NTERFACE CONFIG COMMAND SET 644
- Syntax Description> 692
- BGP CONFIGURATION COMMAND SET 705
- <slot/port> 722
- Usage Example 795
- (config)#interface tunnel 1 796
- HDLC COMMAND SET 811
- COMMON COMMANDS 922
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