Bug ID 441079: BIG-IP 2000/4000: Source port on NAT connections are modified when they should be preserved

Last Modified: Oct 16, 2023

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

Known Affected Versions:
11.4.1, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.6.0, 11.6.1, 11.6.2, 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

Fixed In:
13.0.0, 12.1.3.6, 11.6.3, 11.5.5

Opened: Dec 17, 2013

Severity: 3-Major

Related Article: K55242686

Symptoms

The BIG-IP system is modifying the source port on NAT connections.

Impact

This impacts any applications where the source port is expected to be preserved.

Conditions

This occurs when NAT is configured on the BIG-IP system. This occurs on BIG-IP 2000/4000 hardware platforms.

Workaround

None.

Fix Information

The source port is always preserved for NAT connections.

Behavior Change

The source port is always preserved for NAT connections.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips