Recent posts

Subnetting Made Easy, Part 1

August 27, 2011 | 3 minute read

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...

Single Public IP NATing to Multiple Hosts

August 26, 2011 | 2 minute read

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...

Multiple Public IP NATing to Multiple Hosts

August 26, 2011 | 3 minute read

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...

EIGRP Network Command Tips

August 08, 2011 | 2 minute read

I discussed the EIGRP “network” command in the EIGEP Network Command – The Easy Way Out post, as well as the EIGRP Route Advertising post, and I’m about to discuss it again in this post. Who knew one command would be the source of so many posts! :) If given incomplete information, the EIGRP “network” command will do its best to help you complet...

EIGRP Network Command - The Easy Way Out

August 08, 2011 | 1 minute read

In my EIGRP Route Advertising post I said “in order for two routers to exchange EIGRP routes, they must both be part of the same subnet and have a network command specifying that particular subnet, or, at the very least, their specific IP address on that subnet”. In that entry I then went on to use the routers’ specific IP addresses. In this ent...