I do not have this program, but I think it is posible to ban IP's with it so I will try to help you.
you can also watch how it is done in this a short video or use adress: http://support.kaspersky.com/kis2010/firewall?qid=208280579
Press on attachment below and you will get bigger picture
*open the main application window
*in the right upper corner click Settings
*in the Protection section select the Firewall component
*make sure that the Firewall component is enabled (the Enable Firewall box is checked)
*click the Settings button
*in the Firewall window in the Filtering rules tab select the required program (LOS Vietnam)
*click the Add link
*in the Network rule window in the Action section select:
*Check the Log events, if you want to log actions performed according to the rule (so you will be always able to see if he trayed to flood you)
*in the Network service section select the service: DNS over UDP
*in the Address section select one of the following:
o Addresses from group. You want to create a new group. In order to do this, click the Add link in the lower part of the section and in the Network addresses window that will open specify the addresses.( I am not sure if this is that "CIDR" address (it converts long ranges to 1 line. I converted whole Credo's IP range for you so it should be ok) or not but I think it is so type:
*click the OK button in the Network rule window
*the created rule appears in the Filtering rules tab in the Firewall window
*click the OK button in the Firewall window
*in the Settings window click the OK button
*close the main application window.
let me know how it goes.. I would like to test it with you. note that this might be wrong... this is 1st time Im facing this program.