Types of WAN Links

I’ve found this table that I created a while ago and it lists common WAN connections that businesses use. I have used this table like a reference guide to familiar myself into other protocols. People don’t think of it much but the WAN is a different beast compared the LAN as it uses different protocols besides Ethernet. The WAN or wide area network is what connects us to remote locations within a organization. If we have an office in New York and another office in Wyoming  we need these offices to be connected to each other so that they seem to be on the same network even though they are miles away these types of WAN connections and protocols  would do it. Continue reading “Types of WAN Links”

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Dynamic Routing Protocols

If you ever wanted to set up a network manually, you will quickly find how much overhead is required to get PCs, printers, and other network equipment. That’s where dynamic routing protocols come into play although they are helpful I strongly urge you to understand static routing first. (See the post Configure Static Routing) So for today’s post let’s get the foundation of understanding dynamic routing protocols. Continue reading “Dynamic Routing Protocols”

Configure Static Routing

Plugging Cisco routers together and hoping they work out of the box is not something you should hope for. A router can learn about networks in two ways, manually from configured static routers which we will talk about today and dynamic routing protocols which will talk about on Wednesday. Let’s get started! Continue reading “Configure Static Routing”

Configuring NAT (One to One Mapping)

In this simple tutorial we are going to be configuring a static NAT which is a one-to-one mapping between an inside IP address and an outside IP address. (One private to one permanent address) Using this type of NAT would be helpful for outside devices accessing your inside devices. (Like a web server) Let’s get started!!

NAT One to One

Looking at the topology above you can see that we have a server inside of are network and want people to access this server outside of are network. Using NAT will help us accomplish this task! Continue reading “Configuring NAT (One to One Mapping)”

Configuring PAT

This tutorial will help you configure PAT (Port Address Translation), or sometimes called NAT (Network Address Translation) with overload on a Cisco router. PAT uses multiple private IP addresses and translates them into a single or very few public IP addresses. This is possible because the private IP addresses are mapped to the port number of the PC. Let’s get started!!!

Port Address Translation

With the above shown topology we see that we are using two routers called ISP and R1 we also have one switch (default configuration) and a PC connected to R1’s Fa0/0 interface.

Both routers need to be setup with basic router configuration and IP address added to the interfaces of ISP and R1 along with the PC to be configured with the supplied IP address. Also a default-gateway on the PC and clock rate on ISP’s serial interface before we can get stated. (This tutorial is assuming you can already do that) 😉 Continue reading “Configuring PAT”