There are many ways you can block users from accessing websites they shouldn’t be, such as firewalls, proxy servers, DNS servers, etc. However, if you have a small setup, chances are you may not have any of these in place already, and you may be reluctant add another piece of equipment to your network. This is where your Cisco router can come t...
In my previous post, Subnetting Made Easy, Part 1, I demonstrated the way I use to find the Network Address, First Usable Address, Last Usable Address and Broadcast Address when given any IP address and subnet mask. This time I will demonstrate how this process can also be used when dealing with multiple, consecutive subnets. To make things eas...
There are a wide range of techniques people use to work out their network, host and broadcast addresses. I prefer to take the binary approach as I find it the quickest and easiest method, and is never wrong. Remember, the four most important things to know about a subnet is the following: Network Address: First Usable Address: Last Usab...
In my previous blog entry, Multiple Public IP NATing to Multiple Hosts, I described how you can use “one to one” NATing to allocate one public IP address per internal host. This is a great solution for those who have multiple public IPs, however, these usually come at an added monthly cost. An alternative to this method would be to run your ser...
I have seen quite a lot of ask the question, “how do I NAT multiple public IPs to multiple inside hosts?”. I think what confuses most people is when they are given two different subnets. As per the diagram below, R1 has a 203.43.94.x address for its internet connection and a 94.56.43.x range for its internal hosts. This type of configuration is...