Post Views: 2,405 This How To covers something called Black Hole Routing using the NULL interface in Cisco IOS. The entire YouTube network went down in 2009, 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
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Post Views: 2,009 If you routinely have to change or modify your Windows configuration, especially for things like printers and networks, you find yourself navigating the Control Panel maze of choices to get to the place where this can be done. This can become tedious and time consuming. What if you had a place where
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Post Views: 12,360 In the prior articles (Getting Started with nmap and Deeper Scanning with nmap), we showed you how to get started, and how to dive deeper with this superb network scanner. Let’s go even deeper! One of the cool things nmap has is the ability to create scripts. Now doing this from
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Post Views: 12,500 In my prior article on getting started with nmap, I showed you how to get started with this superb network scanner. In that article we did basic scans to locate what hosts were on a given network and display what services were running on those hosts. In this article I am going
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Post Views: 12,737 Welcome to my little nmap cheat sheet! To learn more about nmap – check out my articles: Getting Started with nmap and Deeper Scanning with nmap and Even Deeper Scanning with nmap and Advanced nmap Scripting Engine. There was no intent here to recreate the full nmap capabilities, that would have been a waste
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Post Views: 13,996 Nmap (“Network Mapper”) is a free and open source (license) utility for network discovery and security auditing that has been around since 1997. Surveillance and network scanning is often one of the first steps in Penetration Testing or Security Validation. Many systems and network administrators also find it useful for tasks such
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Post Views: 2,884 In this How To we will explain the basics of SSH configuration on Cisco IOS. To start, we recommend you verify you have the correct IOS version that supports triple-DES and SSH. With that said, let’s jump in. First, make sure your router has a hostname by using the hostname command. Here’s
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Post Views: 2,813 A common misunderstanding with configuring Cisco routers is the meaning of the ‘bandwidth’ command. Following a recent discussion we had with a client we thought it appropriate to add some specifics to our Tech Tips area. Let’s say you have a serial interface between two Cisco routers and the interface is up
Post Views: 2,284 The Web Cache Communications Protocol (WCCP) is used to redirect traffic (usually Web page requests) to another device in real time. The most common use for WCCP is redirecting Web traffic to a server that provides Web caching, filtering, or other services. You can enable WCCP on your router, but you should
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Post Views: 2,247 In this How To we will introduce the concepts of Quality of Service or QoS (kwas). Managing QoS is an important process and skill that everyone who runs a network needs to understand. We will introduce you to QoS principles at a high level. You will find details in other How To’s.
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Post Views: 1,888 Have you ever loaded a router with IOS that is too big for memory? If you have, then you have ended up in a problem and the router dumps you to ROM Monitor or ROMMON prompt. In this How To we weill explain what to do. There is a simple way to
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Post Views: 1,979 In this How To we will explain the procedure for Warm Upgrade and Reload. The examples are shown on a Cisco 2811 Router. The warm upgrade feature of the Cisco IOS was offered in Cisco IOS version 12.3(11)T. The warm reload feature of the Cisco IOS was offered in IOS version 12.3(2)T.
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Post Views: 1,910 This How To explains username configuration. Short and sweet. Step 1: With use of below command we can create User in Cisco Router Cell_Router(config)#username AWALDING priv 15 password CELLSTREAM Step 2: Also, we have to enable this at each line Cell_Router(config)# line con 0Cell_Router(config-line)#login local Cell_Router(config)# line vty 0 15Cell_Router(config-line)#login local Cell_Router(config)# line
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Post Views: 2,175 This How To explains the process of upgrading IOS on a Cisco Router. Before starting the procedure of IOS upgrade or installation, you will need to install TFTP server software on a PC connected to the router Ethernet interface. There are many free downloadable TFTP servers’ software on the Internet. Afterwards, you
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Post Views: 2,476 In this How To we will provide an overview of Smartports and how they can help with your Cisco switch administration. Cisco now calls these Auto Smartports. The Smartports macros can speed up deployment while ensuring accuracy and consistency on your switch ports. Simply put, Smartports macros are pre-created configuration scripts that
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