Udp Helper With No Configured Broadcast Addresses; Troubleshooting Udp Helper - Dell Z9000 Configuration Manual

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UDP Helper with No Configured Broadcast Addresses

The following describes UDP helper with no broadcast addresses configured.

If the incoming packet has a broadcast destination IP address, the unaltered packet is routed to all

Layer 3 interfaces.

If the Incoming packet has a destination IP address that matches the subnet broadcast address of any

interface, the unaltered packet is routed to the matching interfaces.

To display debugging information for troubleshooting, use the debug ip udp-helper command.

Example of the debug ip udp-helper Command

Dell(conf)# debug ip udp-helper

01:20:22: Pkt rcvd on Te 5/1 with IP DA (0xffffffff) will be sent on Te 5/2 Te

01:44:54: Pkt rcvd on Te 7/1 is handed over for DHCP processing.

When using the IP helper and UDP helper on the same interface, use the debug ip dhcp command.

Example Output from the debug ip dhcp Command

Packet 0.0.0.0:68 -> 255.255.255.255:67 TTL 128

2005-11-05 11:59:35 %RELAY-I-PACKET, BOOTP REQUEST (Unicast) received at

172.21.50.193 BOOTP Request, XID = 0x9265f901, secs = 0 hwaddr = 00:02:2D:8D:

giaddr = 0.0.0.0, hops = 2

2005-11-05 11:59:35 %RELAY-I-BOOTREQUEST, Forwarded BOOTREQUEST for 00:02:2D:8D:

to 137.138.17.6

2005-11-05 11:59:36 %RELAY-I-PACKET, BOOTP REPLY (Unicast) received at interface

194.12.129.98 BOOTP Reply, XID = 0x9265f901, secs = 0 hwaddr = 00:02:2D:8D:

giaddr = 172.21.50.193, hops = 2

2005-07-05 11:59:36 %RELAY-I-BOOTREPLY, Forwarded BOOTREPLY for 00:02:2D:8D:

128.141.128.90 Packet 0.0.0.0:68 -> 255.255.255.255:67 TTL 128

IPv4 Routing