Using cisco’s embedded event manager to aid in troubleshooting

Posted on by David Vassallo

In my previous post I explained a setup in which multiple cisco nodes send syslog messages to a centralised syslog server which network admins would check during troubleshooting. As an extension to that, we had another requirement proposed. To facilitate troubleshooting, we wanted to display the interface description when an error occurred on an interface. … Continue reading Using cisco’s embedded event manager to aid in troubleshooting

TCP zero windows

Posted on by David Vassallo

Yet another reason downloads can fail… Issue : Large file is being downloaded (eg an ISO running above 500MBs). The file starts off downloading fine, but eventually stops downloading, leaving the file incomplete. Cause (in this case) : TCP zero windows caused the server to reset the connection Troubleshooting : In wireshark, run the following … Continue reading TCP zero windows