H3C SOHO IE4300, Command Reference Manual

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undo udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs
| tftp | time }
Default
No UDP port numbers are specified for UDP helper.
Views
System view
Predefined user roles
network-admin
Parameters
port-number
: Specifies a UDP port number in the range of 1 to 65535 (except 67 and 68).
dns
: Specifies the UDP port 53 used by DNS packets.
netbios-ds
: Specifies the UDP port 138 used by NetBIOS distribution service packets.
netbios-ns : Specifies the UDP port 137 used by NetBIOS name service packets.
tacacs
: Specifies the UDP port 49 used by TACACS packets.
tftp
: Specifies the UDP port 69 used by TFTP packets.
time
: Specifies the UDP port 37 used by time protocol packets.
Usage guidelines
Upon receiving a UDP broadcast or multicast packet, UDP helper uses the specified UDP ports to
match the UDP destination port number of the packet.
To specify a UDP port, you can specify the port number or the protocol keyword. For example,
udp-helper port 53 and udp-helper port dns specify the same UDP port.
You can specify a maximum of 256 UDP ports on a device.
Examples
# Specify the UDP port 100 for UDP helper.
<Sysname> system-view
[Sysname] udp-helper port 100
udp-helper server
Use
udp-helper server
to specify a destination server for UDP helper to convert broadcast to
unicast.
Use
undo udp-helper server
to remove a destination server.
Syntax
udp-helper server ip-address [ global | vpn-instance vpn-instance-name ]
undo udp-helper server [ ip-address [ global | vpn-instance
vpn-instance-name ] ]
Default
No destination server is specified for UDP helper to convert broadcast to unicast.
Views
Interface view