F5CAB5: BIG-IP Administration Support and Troubleshooting

By F5 · Question Mode

QuestionQ4

Identify the reason a pool is not working as expected

A gateway_icmp health monitor is configured on a pool. The BIG-IP Administrator is investigating why the pool is shown as down even though the server is active. Other pools with servers in the same subnet are being monitored correctly.

What could cause this behavior?

Explanation

A Gateway ICMP monitor succeeds only when it receives a response to an ICMP echo probe. A host-based firewall on the affected server can block ICMP echo requests or replies, so BIG-IP reports the monitored pool as down even when the server and its other services are active.

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