Udp Helper Configuration - 3Com 400 Family Configuration Manual

UDP Helper UDP Helper configuration includes:
Configuration
Enabling/Disabling UDP Helper Function
■
Configuring UDP Port with Replay Function
■
Configuring the Relay Destination Server for Broadcast Packet
■
Enabling/Disabling UDP Helper Function
When the UDP Helper function is enabled, you can configure the UDP ports where
UDP function is required and the relay function is enabled at UDP ports 69, 53, 37,
137, 138, and 49. When the function is disabled, the relay function configured at
all UDP ports, including the default six ports, is disabled.
Perform the following configuration in System View.
Table 92 Enabling/Disabling UDP Helper function
Operation
Enable UDP Helper function
Disable UDP Helper function
By default, the UDP Helper function is disabled.
Configuring UDP Port with Replay Function
When the UDP relay function is enabled, by default the system forwards the
broadcast packets on the UDP ports listed in
256 UDP ports with the relay function.
Table 93 Default UDP Ports List
Protocol
Trivial File Transfer Protocol (TFTP)
Domain Name System (DNS)
Time service
NetBIOS Name Service (NetBIOS-NS)
NetBIOS Datagram Service (NetBIOS-DS)
Terminal Access Controller Access Control System (TACACS)
Perform the following configuration in System View.
Table 94 Configuring UDP Port with Replay Function
Operation
Configure UDP port with
replay function
Remove the configuration
Note that:
You must first enable the UDP Helper function and then configure the UDP
■
port with the relay function. Otherwise, error information will appear.
The parameters
■
respectively refer to the six default ports. You can configure the default UDP
port in two ways: specifying port IDs and specifying the correct parameters.
Command
udp-helper enable
undo udp-helper enable
Command
udp-helper port { port | dns | netbios-ds |
netbios-ns | tacacs | tftp | time}
undo udp-helper port { port | dns | netbios-ds |
netbios-ns | tacacs | tftp | time }
dns, netbios-ds, netbios-ns, tacacs, tftp

UDP Helper Configuration

Table 93. You can configure up to
UDP port ID
69
53
37
137
138
49
91
and
time