Bug ID 442020: Neighbor discovery might not work correctly with VLAN group

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
11.2.0, 11.2.1, 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, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10

Fixed In:
11.6.0, 11.5.2, 11.4.1 HF4

Opened: Jan 02, 2014
Severity: 3-Major
Related Article:


Certain clients (such as Windows clients) can lose router information even if previously advertised via router advertisement. This occurs because neighbor discovery messages are handled by proxy even in transparent mode for VLAN groups.


Some clients might lose router information and cannot send traffic.


Conditions under which this manifests are inconsistent, but it appears to affect Windows clients in various scenarios. For example, when host on one VLAN sends a neighbor advertisement with the router bit set, the proxy code does not preserve it in the proxied response.


avoid stateless auto-configuration or do not auto-configure cross vlan boundaries.

Fix Information

Router information is now preserved correctly by proxy ARP/NDP code for VLAN groups.

Behavior Change