Bug ID 442656: Leasepool IP address availability

Last Modified: Nov 07, 2022

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
10.2.4, 11.0.0, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4

Fixed In:
11.6.0, 11.5.1 HF5, 11.4.1 HF6, 11.4.0 HF8

Opened: Jan 10, 2014

Severity: 3-Major

Related Article: K16215


Under specific sequence of PPP tunnel establishments and teardowns due to timeout, records of assigned leasepool IP addresses may not be cleaned up properly. The problem prevents future tunnels from reusing these addresses and there is no way to reclaim these addresses. "IP Addr collision" warning messages will appear in /var/log/apm whenever a new tunnel attempts to re-use any of the leasepool addresses that are marked in use due to improper cleanup.


Affected leasepool addresses cannot be used again.


APM with full webtop with a single Network Access resource assigned.



Fix Information

Fixed race condition of multiple establishments/teardown of PPP tunnels lead to loss of availability of leasepool addresses.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips