Configuring UDP helper to convert broadcast to unicast
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.
To configure UDP helper to convert broadcast to unicast:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enable UDP helper. | udp-helper enable | By default, UDP helper is disabled. |
3. Specify a UDP port number. | udp-helper port { port-number | dns | netbios-ds | netbios-ns | tacacs | tftp | time } | By default, no UDP port numbers are specified. |
4. Enter interface view. | interface interface-type interface-number | N/A |
5. Specify a destination server for UDP helper to convert broadcast to unicast. | udp-helper server ip-address [ global | vpn-instance vpn-instance-name ] | By default, no destination server is specified. If you specify multiple destination servers, UDP helper creates one copy for each server. Use this command on the interface that receives broadcast packets. |