Fwbuilder help. ( IP address range )

Grtyop · 08-03-2013, 11:52 PM

Anyone with experience in using Fwbuilder here ?

I am trying to set a firewall rule in which any computer from 192.168.3.0/24 is allowed to connect to a particular IP.

How do I configure the 192.168.3.0/24 portion ?

i am currently using the Address Range object and setting the Start range to 192.168.3.0 and End range to 192.168.3.255.

I read that there is a better way to do it via Network Objects with subnet mask of 255.255.255.255 . How do I go about doing so ?

Thanks in advance.

Ser Olmy · 08-04-2013, 05:02 PM

Your question is not really specific to Firewall Builder.

192.168.3.0/24 is a network, and you should create a network object in Firewall Builder. The "/24" CIDR notation represents a 255.255.255.0 netmask.

Grtyop · 08-05-2013, 03:12 AM

Quote:

Originally Posted by Ser Olmy

Your question is not really specific to Firewall Builder.

192.168.3.0/24 is a network, and you should create a network object in Firewall Builder. The "/24" CIDR notation represents a 255.255.255.0 netmask.

Oh, so a network object with 192.168.3.0 as the IP address and 255.255.255.0 as the subnet mask represents the IP address range of 192.168.3.0 - 192.168.3.255 ?

Ser Olmy · 08-05-2013, 04:31 AM

Quote:

Originally Posted by Grtyop

Oh, so a network object with 192.168.3.0 as the IP address and 255.255.255.0 as the subnet mask represents the IP address range of 192.168.3.0 - 192.168.3.255 ?

192.168.3.0 is the network address. The last "0" in the subnet mask means the network covers the 0-255 range.

I think you'll find it well worth your time to take a closer look at how IP subnetting works.