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Tag Archives: trouble shoot
Cisco Switch SPAN Port Filtering
If you have a bit of familiarity Cisco switches you may have configured a SPAN port or a monitor session in the past. A basic span port is very useful in capturing packets or passively monitoring and is a requirement for some web filtering services such as Websense. Today, I want to focus on the SPAN session from a packet capturing standpoint.
If we mirror a switch port that sees a high volume of traffic simply mirroring all of that traffic to our packet capturing port could be too much for our capture system to consume. Fortunately, there is a way to do this through access control lists on the switch itself. Continue reading
Posted in Networking Tagged cisco, configuration, IOS, packet capture, testing, trouble shoot 4 Comments
Capture Files from Data Streams with Wireshark
Most networkers are familiar with the basic capabilities available in Wireshark. Packet captures are very helpful when troubleshooting a host of network problems. One feature folks may be less familiar with in Wireshark is it’s ability to actually save files that were seen as part of a packet capture. Continue reading
Disable Domain Lookup on Typos
Don’t you hate when you type a command incorrectly and your Cisco IOS device seems to take forever to time out and give you back control? There is a way around this without fully disabling domain lockups! Continue reading
Routing Protocol Basics
I wanted to take the opportunity to post some core basics for those of you just getting started with Cisco and routing protocols. The table below shows the protocol, the type of routing protocal and the default administrative distance of that protocol.
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