Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2
Fixed In:
11.6.0, 11.5.1 HF3, 11.5.0 HF4, 11.4.1 HF4
Opened: Mar 06, 2014 Severity: 3-Major Related Article:
K15346
The BIG-IP system may incorrectly respond to Address Resolution Protocol (ARP) requests after entering standby state.
Connection requests to virtual servers, secure network address translations (SNATs), and network address translations (NATs) may be sent to the standby BIG-IP system. Packet captures show that the standby BIG-IP system incorrectly responds to ARP traffic. For more information, see SOL15346: The BIG-IP system may incorrectly respond to ARP requests after entering standby state on AskF5.
This occurs when the BIG-IP system has transitioned to standby and the 'next_active' device is unknown (for example, after experiencing a gateway failsafe event).
Disable gateway fail-safe
When entering standby due to a failover condition, the BIG-IP system no longer incorrectly responds to ARP requests.