Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

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ltp_55848's avatar
ltp_55848
Icon for Nimbostratus rankNimbostratus
Nov 10, 2011

LTM and GTM interfaces with same MAC

Hi All,     I'm experiencing an odd problem with unit running both LTM and GTM on which I have both an LTM virtual and a GTM listener defined on the same subnet.     When a monitor/probe i...
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Spidey_29396's avatar
Spidey_29396
Icon for Nimbostratus rankNimbostratus
Nov 10, 2011

 

I had set up two boxes(3900) both connected to a switch with the switchports Configuration:

 

switchport access vlan 341

 

 

I have the following IPs:

 

Unit 1 (self - 202.126.47.26, floating 202.126.47.28/29)

 

 

Unit 2 (self - 202.126.47.27,

 

floating 202.126.47.28/29)

 

 

here are the test results:

 

 

Default gateway - 202.126.47.25

 

 

Ping test from Unit 1 to Unit 2 - unsuccessful

 

PIng test from Unit 1 to Gateway - successful

 

PING test from Unit 2 to Gateway - unsuccessful

 

 

We tried swapping the cables on F5 end:

 

 

Ping test from Unit 1 to Unit 2 - unsuccessful

 

PIng test from Unit 2 to Gateway - successful

 

PING test from Unit 1 to Gateway - unsuccessful

 

 

We tried replacing the cables but same results.We tried changing ports on Switch side but same results.

 

 

Can you help us determine what's the next step or solution to be done?