Irule to limit access to VIP to only certain source ip addresses

The format varies between older and newer BIG-IP versions, but this is what an internal address datagroup looks like in 11.4+

ltm data-group internal /Common/my_ips {
    records {
        10.70.0.0/24 { }
        10.80.0.0/24 { }
    }
    type ip
}

If you created this as a text file you can merge it like so:

tmsh load sys config merge file my_ips.txt