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The workstation at the bottom sends a packet to the server along the green path, and it goes through the firewall on the left. But,…
Since perfect network security is impossible, your goal is to cover as many of the risk areas as you can with the budget you have. In…
What is a network diagram and why is it important for your business? Learn more about the importance and purpose of a network diagram…
Good network diagrams aren't hard to make, yet they're distressingly rare. Even network engineers with years of experience often make…
Follow these 5 simple steps to configure Cisco AnyConnect VPN on ASA firewalls for your network.
NAT—network address translation—is an important tool for both conserving IP addresses and enhancing security. Here's how it works.
Should you use VPN split tunneling? Here's what you need to know to decide.
There are two important protocols required to get your network to forward multicast packets. Here's how to configure & troubleshoot them.
Multicast networking is based on the concept that a single packet can be sent by a server & it will be received by many receivers. Here's…
There are several special IP address ranges that have specific purposes. Network engineer Kevin Dooley explains what they are & the…
You don't need that subnet calculator! Not when you have this handy guide to subnetting using both mask and CIDR notation.
A bring your own device policy is more important than ever since users can bring unsecured personal devices into your office. Here's how…
The cybersecurity landscape has changed a lot thanks to the increase in cloud-based services, and zero-trust is now an extremely…
Every modern network device has at least some syslog capabilities. Learn all you need to know about how to configure syslog on Cisco…
Almost every device on a network has a syslog agent you can use to send messages to a central location. Here's how the network-based…
Web proxies intercept traffic from your systems as they move to others, analyze the packets, and send the data along.
There’s a vast difference between the incredibly sophisticated long-term attacks against high-profile companies and government…
In a handful of recent incidents, I helped clients troubleshoot network problems. The errors turned out to be switch features that were…
One of the keys to effective network management is syncing clocks on all network devices. There are really two ways to do it.
Complexity is an enemy to reliability. The more complex something is, the harder it is to understand, the greater the chance of human…
Configuration management is one of those network management topics people often neglect. It’s not very exciting—but it’s incredibly…
With the move to cloud, disaster recovery has become a special challenge. You now have to worry about what you’ll do if the Internet…
Are you seeing poor network performance but with link utilization well below 100%? You might have an issue with your TCP window size.…
Considering a next-generation firewall? To help you understand the huge array of available options, engineer Kevin Dooley describes the…
Link aggregation is a way of bundling a bunch of individual Ethernet links together so they act like a single logical link. Learn more on…
ACL on a Cisco ASA firewall looks simple, but becomes unwieldy if not organized and managed. Learn more about Cisco ASA ACL best…
Spanning tree is a Good Thing. It saves you from loops, which will completely shut down your client's network. But it has to be…
Everybody agrees network documentation is extremely important, but there tends not to be a lot of agreement on what that documentation…
Unused gear sitting on a network can get very expensive. Get it off there! Here are some general best practices for removing network…
One of the things that becomes more important in a cloud-based application environment is managing user access and authentication. Part 3…
When a company’s application infrastructure moves to the cloud, a reliable Internet connection becomes mandatory. Unfortunately, the…
In this three-part series, we dig into the implications of a cloud migration and outline some of the network changes that are required to…
Cisco made huge changes to the configuration syntax on ASA firewalls starting in version 8.3. Here are some real-world pointers for…
Auvik lays out everything you need to know about drawing and creating network diagrams. Check out this infographic for help on how to…
Back in January, I blogged about zero-trust network architecture as an emerging trend. Zero-trust is now in the news again with Google's…
In this followup to What Every Network Admin Should Know About IPv6, network engineer Kevin Dooley shows you how to enable and configure…
IPv6 comes pre-enabled on a lot of network devices — that’s dangerous unless you’re in control. Here’s what you need to know to…
Centralized authentication improves the manageability & security of your network. In this article, network engineer Kevin Dooley…
What networking trends will we see come to life in 2015? Think security, speed, and cloud.
Executives really appreciate techies who communicate well. It's a rare skill and it translates into promotions and bigger paychecks…
Network pro Kevin Dooley shares the stories of four painful network management mistakes -- and tips on how you can avoid the same goofs.
Routing problems tend to emerge when you're first setting up a new piece of network equipment, and when something has failed. Usually…
Many physical troubleshooting exercises come down to the process of swapping out elements until the problem goes away. The key is to…
SSH (Secure Shell) is a command line interactive interface, similar to Telnet, but encrypted. Learn how to configure it in 6 simple steps…