Bug ID 421495: IPv6 router advertisments need to be squelched when DAD conflicts are detected

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2, 11.3.0 HF8, 11.3.0 HF8

Opened: May 20, 2013
Severity: 3-Major


In IPv6 strict compliance mode all IPv6 operations needs to be stopped when duplicate IPv6 addresses are detected. Because of this, BIG-IP may continue to send out configured route advertisements.


BIG-IP may continue using configured IPv6 addresses and send out RA even if DAD is detected.


This is applicable only to IPv6 strict compliance. Without it BIG-IP does not perform duplicate address detection (DAD) and always configures addresses.


Avoid duplicate address situations. With properly configured networks, this is no issue.

Fix Information

Duplicate address detection now behaves according to IPv6 RFC.

Behavior Change