Bug ID 881937: TMM and the kernel choose different VLANs as source IPs when using IPv6.

Last Modified: May 29, 2024

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

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.1.4,,,,,,, 14.1.5,,,,,, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,,, 16.0.1,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,,, 17.0.0,,, 17.1.0,,,, 17.1.1,,,

Opened: Feb 18, 2020

Severity: 3-Major


IPv6 traffic generated from the host, either from a host daemon, monitors, or from the command line, can use a MAC and IPv6 source address from different VLANs.


Traffic to the destination may fail because the incorrect source IPv6/MAC address is used, which might cause monitor traffic to fail.


-- Multiple VLANs configured with IPv6 addresses. -- Multiple routes to the same destination, either the same or more specific, default routes, etc., that cover the traffic destination. -- Changes are made to routes that cause the traffic to the destination to shift from one VLAN and gateway to another. This can be typically observed with dynamic routing updates. - The db key snat.hosttraffic is set to disable.


tmsh list sys db snat.hosttraffic tmsh modify sys db snat.hosttraffic value enable tmsh save sys config

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips