Views: 6,113Scenario Let’s say you have a DHCP server running on a Cisco Switch that is behaving strangely and you want to examine the traffic over a couple of hours while not creating a gigantic unmanageable capture file. A note here: I am doing this on a Cisco switch, but most all vendor switches support
Troubleshooting Your Network Using Port Mirroring and Packet Capture Read More »
Views: 22,042Wi-Fi has become an essential part of everyday life. Whether you are a homeowner, small business, enterprise organization, educational institution, or service provider, reliable wireless connectivity is critical to productivity, communication, entertainment, and business operations. As our dependence on cloud services, video conferencing, streaming applications, smart devices, IoT technologies, and mobile computing continues to
Wi-Fi and WLAN Site Survey Consulting Services Read More »
Views: 1,907We are always adding to, and updating the technical “how to’s” contained here. When it comes to configuring a new Cisco router, much of the configuration depends on what type of router it is as well as the purpose it will serve. However, there are certain things you should configure on every new Cisco
Top 10 Cisco IOS Classic Commands Read More »
Views: 4,269Welcome to our Cisco IOS Classic Command Cheat Sheet! Cisco switches and routers use the Internetwork Operating System (IOS), which configures and controls the device’s performance and behavior. Cisco’s IOS defines an interface called the Command Line Interface (CLI), which enables administrators to enter commands into a terminal emulation program. The CLI can be
Cisco IOS Classic Command Cheat Sheet Read More »
Views: 1,989Accessing the Internet is almost taken for granted today by most workers. They get very comfortable simply opening the lid to their laptop, turning on the wireless or connecting a cable and having access. For many of our clients, this notion of “open access” has been a continual challenge. On the one hand, visiting
Switch Port Security Usage in Cisco IOS Read More »
Views: 3,056The Show Environment command can be very helpful to alert you of potential hardware issues. You will need to access this command in global Exec mode. Here are the options available for the Show Environment command: show environment [alarms | all | fans | hardware | last | leds | power-supply | table |
Show Environment Command in Cisco IOS Read More »
Views: 2,643Point-to-Point (PPP) Protocol is an excelent Layer 2 protocol used to establish a direct connection between two nodes. It can provide connection authentication, transmission encryption (using ECP, RFC 1968), and compression. PPP was designed somewhat after the original HDLC specifications. The designers of PPP included many additional features that had been seen only in
PPP Configuration in Cisco IOS Read More »
Views: 5,262Whenever we teach our Hands-On courses, we always have a section of the course that discusses troubleshooting the network or technology the class is learning. A key part of troubleshooting any network is knowing the technology, no argument. But even the masters of technologies like Multicasting, or IP Networking, or MPLS, still can benefit
Leveraging Logging for Troubleshooting Using Cisco IOS Read More »
Views: 3,690No one wants it to happen but, sooner or later, you will experience a router crash. When you do, you will want to be prepared to save that critical router memory information in order to find out why the router crashed and prevent future crashes. To do this, you need to configure your router
Core Dump in Cisco IOS Read More »
Views: 2,069A common question folks ask is “How do you check the bandwidth utilization on a router?” It is a great question and the answer is not as easy as you would expect. There are tools that accomplish this (i.e. NetFlow and there is another mentioned at the end of this page). However, without those
Bandwidth Utilization – How to Check It on Routers Read More »
Views: 1,551In this How To we will reveal how to bypass the system password on Cisco IOS routers. This procedure is used regularly by CellStream consultants. As you will see, we are changing the configuration register to alter the boot process to exclude the configuration files that the router has, as within those configuration files
Reload Procedure to Bypass System Password Read More »
Views: 2,154In this How To we will reveal how to bypass the system password on Cisco IOS routers. This procedure is used regularly by CellStream consultants. As you will see, we are changing the configuration register to alter the boot process to exclude the configuration files that the router has, as within those configuration files
Reload Procedure to Bypass System Password in Cisco IOS Read More »
