Bug ID 1146013: VELOS floating IP may not work properly with IPv4 prefix-length other than /24, /16, or /8

Last Modified: May 29, 2024

Affected Product(s):
F5OS Velos(all modules)

Known Affected Versions:
F5OS-C 1.3.2, F5OS-C 1.5.0

Fixed In:
F5OS-C 1.6.0, F5OS-C 1.5.1

Opened: Sep 05, 2022

Severity: 3-Major


When a VELOS device is configured with a prefix-length other than /24, /16, or /8 for IPv4 management addresses, the system may fail to install correct routes for handling reply traffic sourced from the floating management address. One of the two following situations may occur: 1. The floating management address will not be accessible from other devices on the same local network (cannot ping the floating management IP from the standby system controller). 2. The floating management address will not be accessible from another range of IPs, because the system thinks those addresses are link-local. For instance, if a device is assigned an IP address of [root@controller-1 ~]# ip route show table mgmt-floating4 default via dev mgmt-floating dev mgmt-floating scope link The system will not be accessible from devices with IP address through


Floating system controller management IP may not be able to reply to traffic from all IPs.


-- VELOS controller -- Management network with an IPv4 management address configured, and management network prefix-length other than /24, /16, or /8.


On active system controller (and after any reboot or system controller failover), fix the routing rules. Log in to the active system controller as root and run the following commands: CORRECT_NETWORK=$(ip route show table main | grep mgmt-floating | cut -f1 -d' ') WRONG_ROUTE=$(ip route show table mgmt-floating4 | grep 'scope link') ip route delete table mgmt-floating4 $WRONG_ROUTE ip route add table mgmt-floating4 $CORRECT_NETWORK dev mgmt-floating

Fix Information

The system correctly handles IPv4 management addresses with a prefix-length other than /24, /16, and /8.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips