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3Com Switch 7750 Series
Command Reference Guide – UDP Helper
Chapter 1
UDP-Helper Configuration Commands
1-4
Description
Use the udp-helper port command to specify a UDP-Helper destination port.
Use the undo udp-helper port command to disable a port from being a UDP-Helper
destination port.
With UDP-Helper enabled, UDP broadcast packets with their destination port being the
six default UDP ports (that is, port 69, 53, 37, 137, 138, and 49) are forwarded to the
configured destination servers by default. After the UDP-Helper function is disabled, all
the configured UDP-Helper destination ports are cancelled, including the default UDP
ports.
Note that before configuring udp-helper port, you must enable UDP-Helper.
Example
# Configure the DNS UDP port as a UDP-Helper destination port.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] udp-helper port dns
1.1.5 udp-helper server
Syntax
udp-helper server ip-address
undo udp-helper server [ ip-address ]
View
VLAN interface view
Parameter
ip-address: IP address of the device to be configured as a destination server, in dotted
decimal notation.
Description
Use the udp-helper server command to specify a destination server for the UDP
broadcast packets to be forwarded.
Use the undo udp-helper server command to remove a configured destination server.
No destination server is configured by default.
Currently, you can configure up to 20 destination servers on a VLAN interface.
Note that if you do not provide the ip-address argument when executing the undo
udp-helper server command, all the destination servers configured on the VLAN
interface are removed.