D-Link CLI Reference Guide
Page 156
helper-address
The
helper-address
interface configuration command enables the software to forward User Datagram Protocol
(UDP) broadcasts, including BOOTP, received on an interface. To disable broadcast packets forwarding to specific
addresses, use the no form of this command.
Syntax
helper-address address
[
udp-port-list
]
no helper-address address
Parameters
•
address
— Destination broadcast or host address used when forwarding UDP broadcasts.
•
udp-port-list
— The broadcast packet destination UDP port number to forward. If not specified, packets for
the default services are forwarded to the helper address (Range: 1 - 65535).
Default Configuration
By default broadcast packets forwarding to specific addresses is disabled.
If enabling the function and no UDP port number is specified, by default the device forwards UDP broadcast
packets for the following six services:
•
IEN-116 Name Service (port 42)
•
DNS (port 53)
•
NetBIOS Name Server (port 137)
•
NetBIOS Datagram Server (port 138)
•
TACACS Server (port 49)
•
Time Service (port 37)
Command Mode
IP Interface Configuration mode
User Guidelines
•
Many helper addresses can be defined. The maximum number of address-port pairs is up to 128 for the
whole device.
•
The ip helper-address command forwards specific UDP broadcast from one interface to another.
•
BOOTP/DHCP (ports 67,68) packet forwarding is enabled with the DHCP relay commands.
•
The ip helper-address command specifies a UDP port number for which UDP broadcast packets with that
destination port number are forwarded.
Examples
The following example enables the software to forward UDP broadcasts on interface 1.100.100.0 to IP address
172.16.9.9 to ports 49 and 53.
Console(config)# interface ip 1.100.100.0
Summary of Contents for DXS-3250 - xStack Switch - Stackable
Page 12: ...Page 11 ...
Page 46: ...ACL Commands Page 45 ...
Page 68: ...Address Table Commands Page 67 ...
Page 124: ...Ethernet Configuration Commands Page 123 ...
Page 134: ...GVRP Commands Page 133 ...
Page 144: ...IGMP Snooping Commands Page 143 ...
Page 158: ...IP Addressing Commands Page 157 Console config ip helper address 172 16 9 9 49 53 ...
Page 166: ...IP Addressing Commands Page 165 ...
Page 186: ...Line Commands Page 185 ...
Page 194: ...Management ACL Commands Page 193 ...
Page 200: ...PHY Diagnostics Commands Page 199 ...
Page 208: ...Port Monitor Commands Page 207 ...
Page 216: ...Power over Ethernet Commands Page 215 ...
Page 272: ...RMON Commands Page 271 ...
Page 334: ...Spanning Tree Commands Page 333 ...
Page 428: ...VLAN Commands Page 427 ...
Page 466: ...802 1x Commands Page 465 ...