How to change netmask on self ip in version 12

Edit the self ip in webui and change the netmask.

If you have both self and floating ip, you have to do it with tmsh.

First get the current self configuration

list net self one-line    

Then modify it with your favorite text editor and import the new config

load sys config merge from-terminal    

PASTE CONFIG    
Apply with CTRL-D

I should have been more specific. The address that shows up as my GTM and LTM listeners I have an H/A pair with X.X.156.228/28 shared and system 1 had X.X.156.233/28 System B X.X.156.236/28. I wish to change the netmasks of these all to /27

Hi Michael,

There is another and easy way to change the subnet mask of a self IP address.

So,

/config/bigip_base.conf

When you open this file with an editor like "vi" , you should see the Ip address configuration of a specific IP like this.

net self /Common/192.168.10.2 {
    address 192.168.10.2/24
    traffic-group /Common/traffic-group-local-only
    vlan /Common/Vlan328
}

Then, what you need to do is only to change the related subnet mask fields with the new one and save the file.

Finally, run the command

tmsh load sys config