301B: BIG-IP LTM Specialist: Maintain and TroubleshootDemo

Question

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Using the exhibit, a server administrator observes that one server intermittently is NOT sent any HTTP requests. The server logs show no issues. The LTM Specialist sees log entries indicating that node 172.16.20.1 is cycling between down and up status. The pool associated with virtual server 10.10.1.100 has a custom HTTP monitor applied.

Which tcpdump filter will help trace the monitor?

A tcpdump -i internal port 80 and host 172.16.1.31
B tcpdump -i external port 80 and host 10.10.1.100
C tcpdump -i internal port 80 and host 172.16.1.33
D tcpdump -i external port 80 and host 172.16.20.1

Explanation

BIG-IP health-monitor probes originate from the devices’ non-floating self IP addresses. The probe to the pool member uses the internal VLAN and TCP port 80; 172.16.1.31 is the non-floating internal self IP of one BIG-IP device, so filtering that source on the internal interface captures its HTTP monitor traffic.

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301B: BIG-IP LTM Specialist: Maintain and TroubleshootDemo

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Notes

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