david davis

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Filter ICMP traffic in the Cisco IOS

The Internet Control Message Protocol ICMP is not TCP and it's not UDP. However, ICMP is critical to the functionality of any IP network such as your corporate network or the Internet. While ICMP is required for IP network traffic redirection and pinging hosts on your LAN or WAN, ICMP...

Tags: Cisco IOS, Router, Network, Traffic, Cisco Systems Inc., ICMP, Internet Control Message Protocol, Internet, Networking, David Davis

Blog posts 2008-05-15

Use Multilink PPP to combine multiple circuits into a single circuit with a single router interface

At my company, we initially started out with a single T1 for Internet access. That gave us 1.5Mb up and 1.5Mb down. Over time, we outgrew the 1.5Mb down as we added more users. We had to add more bandwidth; however, it was not cost effective to bring in a...

Tags: PPP, Router, T1, Circuit, Multilink PPP, Networking, David Davis

Blog posts 2008-05-08

Learn more about what you can do with the Cisco IOS router command

If you have configured dynamic routing on a Cisco router you have used the router command, but perhaps you haven't really looked at all the options that it offers. In this article, learn about the Cisco IOS router command, what it is, and how it can help you. Static...

Tags: Cisco IOS, Router, Open Shortest Path First, Routing Protocol, Cisco Systems Inc., Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-05-01

Learn to configure Cisco IOS NAT on a stick

A well known NAT configuration is called "NAT on a stick." Besides having a funny name, NAT on a stick can be very useful to network administrators. In this article, learn what NAT on a stick is and how it can help you. What is Network Address Translation? ...

Tags: Cisco IOS, Router, Network, Stick, IP, Network Address Translation, IP Address, Cisco Systems Inc., No., Networking, David Davis

Blog posts 2008-04-24

Run Linux on your Cisco router with Cisco's new AXP module

Cisco has been talking about the "network as a platform" for a long time, but what does that actually mean, and what does the AXP network module have to do with it? What is the AXP? The Cisco Application eXtension Platform AXP is made up of a hardware...

Tags: David Davis

Blog posts 2008-04-17

Implement regular monitoring and improve Cisco router performance

Do you know how your routers are performing? What could you do to improve performance? I'll try to answer those questions by giving you some tips on monitoring and improving your router performance. What is meant by router performance? What network admins actually mean when they talk about...

Tags: Cisco Router, Router, Performance, Monitoring, Cisco Systems Inc., Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-04-10

Fundamentals: Five ways to secure your Cisco routers and switches

Recently, Cisco Subnet blogger Brad Reese wrote the article, "Expert warns of scam to blackmail companies for cash to get back access to their Cisco routers." In that post, he wrote about hackers who manage to hijack a company's routers and then extort money from them by threatening to take...

Tags: Cisco IOS, Password, Cisco Router, Router, Network, Cisco Systems Inc., Access Control, Access Control List, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-04-03

Discover the benefits of Cisco 2800 Series routers

If I had to name some of my favorite Cisco routers, I would definitely include the Cisco 2800 Series on my list. Find out what you need to know about the Cisco 2800 Series, and learn why your organization might want to invest in this new line of routers. ...

Tags: Router, Benefit, Cisco Systems Inc., Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-03-27

Three ways to remotely determine your Cisco router's serial number

At some point, it's a good idea to conduct a router inventory to determine which routers you have as well as their models, RAM, Flash, IOS versions, and serial numbers. I mention the serial number specifically because you need it to both track your routers and to register for a...

Tags: Cisco Router, Router, Cisco Systems Inc., Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-03-18

Send e-mail with your Cisco router

Did you know your Cisco router could send you an e-mail? Until recently, I would have said that it wasn't possible, but today, I'll show you how to do it. And we won't stop there: I'll tell you where to find some other scripts that you can use on your...

Tags: Cisco IOS, Cisco Router, Router, Script, Cisco Systems Inc., E-mail, Tool, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-03-13

Black hole routes: The good, the bad, and the ugly

The entire YouTube network recently went down, across the globe, for about two hours -- thanks to a mistake made by an ISP in Pakistan. That mistake involved a black hole route accidentally distributed around the world. While you may not have a network as large or...

Tags: Router, Network, Traffic, YouTube Inc., Hole, Cisco Systems Inc., Hole Route, Routers & Switches, Network Technology, Networking, BGP, David Davis

Blog posts 2008-03-06

Find the best Cisco router for your needs

With Cisco's router lineup changing so frequently, it can be difficult to stay up to date. What are the current models of routers, and which router would you use for which situations? What's missing from the lineup? For those of us who have been working with Cisco routers...

Tags: Cisco Router, Router, Cisco Systems Inc., Series, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-02-28

Control unwanted traffic on your Cisco router with CAR

Committed access rate CAR -- or "rate limiting" -- is a method for managing unwanted traffic on your network and making sure it doesn't affect important traffic. For example, if someone is downloading a lot of Web traffic from a Web site, he or she could preclude necessary traffic from...

Tags: Cisco Router, Router, Traffic, Cisco Systems Inc., Access Control, Committed Access Rate, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-02-21

What you need to know about the new Cisco CCDE certification

In January, Cisco launched a very important, new high-level certification: the Cisco Certified Design Expert CCDE certification. Will it live up to the hype? Find out the specifics of the CCDE, see how it fits in with other Cisco certifications, and learn why you should consider the CCDE. ...

Tags: Certification, Network, Exam, Cisco Systems Inc., Cisco Certified Design Expert, Quality, Networking, Business Operations, David Davis

Blog posts 2008-02-14

Protect your network with the Cisco IOS Firewall

Why buy another expensive device if your router can also provide firewall functionality? Any "Firewall Feature Set" version of the Cisco IOS contains the IOS Firewall, a built-in firewall inside the Cisco router. Let's find out what the IOS Firewall can do and learn how to configure it. ...

Tags: Cisco IOS, Router, Network, IP, Cisco Systems Inc., Access Control, IOS Firewall, Firewalls, Network Security, Security, Networking, David Davis

Blog posts 2008-02-07

Is pt360 the all-in-one Cisco tool we've been looking for?

Last year, I wrote an article about compiling the ultimate list of Cisco administration tools ("What's the best Cisco router configuration and management tool?"). I listed what I thought were some of the best tools out there, and TechRepublic members chimed in with a ton of comments and recommendations. ...

Tags: Router, Network, Cisco Systems Inc., Tool, PacketTrap, Productivity, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-01-31

Five things you should know about configuring a Cisco IOS switch

Most switches used by small businesses and home offices typically require no configuration -- they're "plug and play." However, it's important to remember that plug and play doesn't always work. In addition, these switches certainly don't offer any troubleshooting, logging, security, or manageability. So once you're ready...

Tags: Cisco IOS, Switch, Cisco Systems Inc., VLAN, LANs, Networking, David Davis

Blog posts 2008-01-24

Run remote commands on a Cisco router from your PC

Can you go to a Windows command prompt and run a command on your router? Usually, you would have to Telnet or SSH to the router first to run the command, right? While this approach works, you can also run router commands without leaving the Windows command...

Tags: Cisco IOS, Cisco Router, Router, PC, Command, IP, Cisco Systems Inc., Routers & Switches, Network Technology, Microsoft Windows, Networking, Operating Systems, Software, David Davis

Blog posts 2008-01-16

Practice Cisco router configuration using a free emulator

A few months ago, I wrote "Eight ways to strengthen your Cisco networking skills," and the second suggestion I listed for improving your abilities was to use a simulator. However, while simulators are useful, there's something even better that you can get for free -- an emulator. What's the...

Tags: Cisco IOS, Cisco Router, Router, Cisco Systems Inc., Emulator, Dynagen, Routers & Switches, Network Technology, Networking, David Davis

Blog posts 2008-01-10

SolutionBase: Does the Cisco Self-Defending Network really work?

The need for security is more important than ever in the business world. It's tough to decide how much to invest and what solutions to choose, but you must ensure that your network is reasonably secure. David Davis explains why the Cisco Self-Defending Network might be the right choice for...

Tags: Security, Theory, Network, Cisco Systems Inc., CSDN, Figure B, Network Admission Control, Networking, David Davis, Cisco Self-Defending Network

Technical articles 2007-12-12