we recently added a Linux server and we are creating filters for it. We are looking for a way to filter IPs that don't belong to any of our 3 blocks of IPs, our 3 blocks together have around 300 IPs. If there is a way to add them all in the filter or rule without having to type all down, or having to create many rules for each one of them that would be great.
Any suggestion will be appreciated.
Alas not ranges or subnets... just straight up wildcards (e.g. 192.168.0.*).
But you CAN create a User-Defined Group that lists all of them or their wildcard versions and use that in filters/rules. You can even create that User-Defined Group as a CSV file and import it so you don't have to do so much clicking.