Troubleshooting is about three big things: predicting what can happen, determining the anomalies, and investigating why that anomalies happened. Many network admins break down network infrastructure problems by analyzing the Layer 3 path through the network, hop by hop, in both directions. This process helps them isolate the problem; once they determine which hop in […]
The 2960G is a great gig switch that is being pulled from corporations and flooding the grey market. The switch is great for home lab use etc. Most people do not know that if you are running a later version of IOS on it it will also do layer 3 routing! this is how you […]
if you spend any time working on networks you are going to come across the need to identify a device connected to a port on a switch. I use primarily cisco equipment and finding the IPs can be quite a pain in the neck if you are searching the mac on the interface then looking […]
If you work with Cisco gear then you need to keep your code updated to stay ahead of security pugs with IOS etc. I always forget a command or 2 so I figured I would write it down for myself as well as others. I am going to go over tftp updating using cli as […]
Recently I needed to disable proxy settings on windows machines in a network. I was trying to remove an old proxy based web content filter (eeewww). I know it is only a few clicks but I am all about not using the sneaker net if i can avoid it. Plus it is always nice to […]
I am sure you have installed a GBIC in a Cisco switch that was not manufactured by Cisco. and your switch no doubt shut down the SFP port and gave the following error %PHY-4-UNSUPPORTED_TRANSCEIVER: Unsupported transceiver found in Gi1/0/0 %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65538 has bad crc well here is how we fix that […]
I have had many people ask me about commands on switches and I was going to make a cheat sheet but Erik Rodriguez did such a nice job I am going to share his work Great job Erik Cisco IOS Cheat Sheet By Erik Rodriguez These commands are used on all Cisco devices running the […]
Most domain admins these days are following the very smart practice of using a normal user account for their day to day work and another for their domain admin tasks. Usually it is the same username with da at the end, beginning or something similar. The trouble comes in when a admin wants to use […]
As most everyone has heard SSL 2.0 has been compromised. Most PCI certification authorities are requiring SSL 2.0 to be disabled. I am sure with poodle SSL 3.0 is not far behind but that is for another article. I have written the following batch file to make all the needed changes and save some legwork. […]
Many times I came across one issue… how to grant access to CLI (Command Line Interface) on Cisco devices without creating separate username and password for each user on each device? In order to resolve that I did use AAA features of Cisco IOS and built-in Windows Server 2008 R2 component – NPS (Network Policy […]
