LTM: Why Is the Client IP Address Not Showing in TCP Dump?

F5 301b Question Answer

-- Exhibit --

Refer to the exhibit.

A company uses a complex piece of client software that connects to one or more virtual servers (VS) hosted on an LTM device. The client software is experiencing issues. An LTM Specialist must determine the cause of the problem.

The LTM Specialist is seeing a client source IP of 168.210.232.5 in the tcpdump. However, the client source IP is actually 10.123.17.12.

Why does the IP address of 10.123.17.12 fail to appear in the tcpdump?

The LTM device performed NAT on the individual's IP address.

The Secure Network Address Translation (SNAT) pool on the virtual server is activated.

Network Address Translation (NAT) has occurred in the path between the client and the LTM device.

The individual's data stream is being routed to the LTM device by a means other than the default route.

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F5 301b Summary

Vendor: F5
Product: 301b
Update on: Jul 25, 2025
Questions: 209

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LTM: Why Is the Client IP Address Not Showing in TCP Dump?

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