...
If flows are not rendering in the opFlow GUI take the following actions.
Verify Flow Data is Received
using tcpdump we can verify that flow data is being received by the server. This example uses the default opFlow UDP port of 9995. Specify the specific host that needs to be verified.
| Code Block |
|---|
[root@poller001 nfdump]# tcpdump -nn -i eth2 host 10.10.1.1 port 9995
tcpdump: syntax error
[root@poller001 nfdump]# tcpdump -nn -i eth2 host 10.10.1.1 and port 9995
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
13:24:55.767037 IP 10.10.1.1.62757 > 10.215.1.7.9995: UDP, length 168
13:25:07.827152 IP 10.10.1.1.62757 > 10.215.1.7.9995: UDP, length 168 |
When we see output such as the example above we know this server is receiving flow data from the network device.
Check the Flow Data
To be continued...
omkd Troubleshooting
If mongod is not running omkd will never start. Ever.
...