Bug ID 424649: Very large translation address space with DNAT can cause blades to restart.

Last Modified: Oct 17, 2023

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

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6

Opened: Jul 05, 2013

Severity: 3-Major

Symptoms

Blades continually fail over with a large enough translation address space in an lsn-pool in DNAT mode. An example of a translation prefix large enough to cause this problem would be /8, or several translation prefixes summing to a large number of translation addresses.

Impact

System is rendered unusable until DNAT mode is disabled.

Conditions

An lsn-pool in deterministic mode, assigned to a virtual server, with a /8 prefix (or similar number of addresses.)

Workaround

Change to NAPT mode, or use a smaller translation prefix range. There is no other workaround.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips