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Configuring UDP helper
About UDP helper
UDP helper can provide the following packet conversion for packets with specific UDP destination
port numbers:
• Convert broadcast to unicast, and forward the unicast packets to specific destinations.
• Convert broadcast to multicast, and forward the multicast packets.
Configuring UDP helper to convert broadcast to
unicast
About broadcast to unicast conversion
You can configure UDP helper to convert broadcast packets with specific UDP port numbers to
unicast packets.
Upon receiving a UDP broadcast packet, UDP helper uses the configured UDP ports to match the
UDP destination port number of the packet.
• If a match is found, UDP helper duplicates the packet and modifies the destination IP address of
the copy to the configured unicast address. Then UDP helper forwards the unicast packet to the
unicast address.
• If no match is found, UDP helper does not process the packet.
Procedure
1. Enter system view.
system-view
2. Enable UDP helper.
udp-helper enable
By default, UDP helper is disabled.
3. Specify a UDP port number for UDP helper.
udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs |
tftp | time }
By default, no UDP port numbers are specified for UDP helper.
Do not set UDP ports 67 and 68 for UDP helper, because UDP helper cannot forward DHCP
broadcast packets.
You can specify a maximum of 256 UDP ports for UDP helper.
4. Enter interface view.
interface interface-type interface-number
5. Specify a destination server for UDP helper to convert broadcast to unicast.
udp-helper server ip-address
By default, no destination servers are specified.
Use this command on the interface that receives broadcast packets.
You can specify a maximum of 20 unicast and multicast addresses for UDP helper to convert
broadcast packets on an interface.
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