Senior Network Engineer, technology enthusiast, guitar and bass player. Joe Wilson is the creator of as well as other niche websites that can be found around on the Internets.

IP Subnet Calculator


To use the IP Subnet Calculator Enter your IP address and subnet mask details in the subnet calculator below.  Our subnet calculator returns with both decimal and binary calculations for the Address, Netmask,  Wildcard Mask,  Network, Broadcast, first and last ip address on the subnet, as well as total number …

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Getting Excellent Training for the CCIE

This week I’m in class to prepare for the Routing and Switching CCIE.  Like many of you out there I’m sure, you have studied on your own for this big Kahuna of all certifications.  I can’t tell you how many times I’ve prepared for the written only to have life …

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Review: Cisco ASA 5500

Firewall Migration

Today we review the Cisco ASA 5500 series firewall/vpn/ips/security device.  For those who don’t remember the Cisco ASA series is the replacement for the PIX as well as the VPN concentrator.  Along with the new line of ISR routers, Cisco is moving swiftly on all fronts to devices that can …

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Monitoring your network for topology changes

So, Your the senior network engineer for a nice large network. Everything is running smoothly until one day a primary link goes down and you seem to be the last one to know about it!  Everyone is running to you to find out whats going on and expecting you to …

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BGP Command “no syncronization”

When you are running BGP on two or more routers that border your network to the outside world, you will need to configure iBGP between all of these BGP peer routers. Just as a quick refresher, iBGP routers are routers that are in the same AS, eBGP routers are in …

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We are Network Engineers

As a network engineer, so much of our daily job is filled with duties that are not necessarily related to networking.  No more is our day filled with just routers and switches. We wear many hats and are asked to do many things. Often times these duties are not always …

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DNS Review: Commercial DNS Appliances


I recently had the opportunity to completely over haul the DNS for a large IT organization and wanted to take this opportunity to do a complete DNS review.  As part of the over-haul, the internal DNS would remain on Windows Active Directory servers however the public facing external DNS servers …

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What is the Cisco 6509 Enhanced?

Recently I was on a project to upgrade our current Cisco 6509 core switches and came across some new changes to the Cisco 6509 chassis. The switches that were being upgraded were just doing basic switching duties, populated with Sup II’s in Slot 1 and primarily had 10/100/1000 switching module …

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