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Tag Archives: networking
Discovering a Cisco Network with CDP (Part 1)
If you have ever been dropped face first into an undocumented Cisco network with little Cisco experience you may have found yourself overwhelmed. Fortunately for admins who have no desire to tone cables or read long mac address tables there is a simple way to map out a network like this. The Cisco Discovery Protocol (CDP) is the answer. There are a few prerequisites but overall the process is fairly simple. First, CDP must be enabled on all of the devices and ports you would like to discover. This typically is the case as CDP is enabled by default on … Continue reading
Fluke Link Runner
When looking for a simple, easy to use and easy to carry network tool I decided on the Link Runner by Fluke Networks. The device its self is about the size of a typically smart phone and about twice as thick. There are only three buttons on the device; a power button and a pair of soft keys. The top of the device has a pair of Ethernet ports that made to the typical RJ-45 connector. I found the device really easy to use. It was as simple as plugging in to both ports and look at the screen to … Continue reading
Testing throughput with TTCP and Cisco Devices
Even if you have been around networking for a while you may have never ran into the TTCP utility. This utility also comes by the name of PCATTCP. It’s a really small command line, data sending, and throughput testing tool. It sends as much data as possible to another remote instance of TTCP. Cisco devices with newer IOS software (11.2 and newer, so a lot of old stuff too by that standard…) and advanced feature sets such as service provider and advanced IP services include this tool, according to the old Cisco documentation I’ve read. This tool was present on … Continue reading
Passive Sniffing on Windows
With Linux you can configure a sniffing only port relatively easy. Put it in promiscuous mode without an IP and sniff away passively. With windows, there is typically always an IP address assigned to an interface. If not statically assigned the interface will search for DHCP and will ultimately end up with an address in the 169 range if no address information is found. Either way there will be information from your machine showing up in a full, unfiltered packet capture. To get around this you will actually want to disable the TCP/IP stack for that interface. If this is … Continue reading
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