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Forum Discussion

Gadget_323147's avatar
Gadget_323147
Icon for Nimbostratus rankNimbostratus
Feb 01, 2018

How to change netmask on self ip in version 12

Network guys changed the mask for two of my GTMs I need to change my mask to match. IOS version 12.1.2 I only need to change the self ip mask.  
application delivery
BIG-IP
Emre_Ovali_1466's avatar
Emre_Ovali_1466
Icon for Cirrus rankCirrus
Feb 02, 2018

Hi Michael,

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

So, 

/config/bigip_base.conf
is the configuration file which includes the networking components of the device.

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

Stanislas_Piro2's avatar
Stanislas_Piro2
Icon for Cumulonimbus rankCumulonimbus
Feb 02, 2018

Modifying files is a wrong idea. I once made a change of this file with a mistake... the appliance detected it, rebooted because of system fallback... then rebooted after 20 seconds... then rebooted...

the same configuration can be made with 

load sys config merge from-terminal
where you paste the expected configuration. if there is a wrong format, it will not apply change and warn you.