Vmware Player Emulation Tip When I’m asked to baseline or troubleshoot an application, the topic of how the application will behave at remote sites comes up. Some people make the mistake of testing an application in the lab and expecting the same performance in the field for remote sites. The problem with that approach is that the real world has variables you can’t account for in the lab. For example there is packet loss and different bandwidth for remote sites. When I get advance notice, I will bring my WAN emulator along. But in this case the client sprung this on me while troubleshooting and baselining. Luckily they were using VMWARE Workstation so we can use the Vmware Player (http://tinyurl.com/y97njgfm). I showed them that in the Network adapter settings, they can modify the bandwidth and packet loss parameters to emulate the network conditions they expect. read the rest when its posted ... https://www.youtube.com/watch?v=gwlzLsvnW40

like, share and subscribe to support my channel.. Troubleshooting WiFi can be challenging enough without adding a remote variable to it. There are times when I wish I could perform a remote Wifi survey. Some access points allow that feature, but rarely do I have access to the client’s access points, nor do I want access. You know, just in case something happens, I don’t want people thinking I was mucking around. A simple solution is to physically go over with a wireless test tool like netAlly’s Aircheck G3 (https://www.netally.com/products/aircheckg3/) , our smartphone, or your laptop. Things start to get tricky when the location is remote. That’s when you can rely on your access point, but be careful since some vendors will cut off all wireless clients while performing a wireless scan. Another option is to purchase wireless sensors that you can connect and perform a scan. And lastly, is to remote into someone’s laptop and check to see which wireless networks they hear. One trick I like to use, when possible, is to determine if they have a wifi printer at the remote site, web into it (they rarely have passwords) and run the printer test/diagnostic feature. Most Wifi printers will also provide wireless information including all the SSID’s it hears. ... https://www.youtube.com/watch?v=0oZ430nV0uc

Troubleshooting FTP Errors With Wireshark The most daunting problem to troubleshoot is when the application spits out a generic error that could mean anything. Here's the analogy; how helpful is the 'Check Engine' light on your car dashboard. The worst part is when the customer tries to take the cryptic, generic application error message and tries to make sense of it in an attempt to assist the analyst. Don't get me wrong, any information is helpful while troubleshooting, but you have to be selective in what you pursue. In this example FTP works one moment and fails the next. Of course the customer immediately called the help desk, who pings the ftp server and comments that is up and no outages have been recorded by the network management system. Then the ticket goes to the server dept who ftp's without an issue, unfortunately by now so can the customer. The server department says the connection error must be a 'network thing'. I captured some packets and have recreated what I found and how the application, Chrome in this example, failed to pass on the FTP server connection limit error. The only way I was able to get real meaningful data is from the wire. This isn't a Chrome 'bash' session since I have seen many applications not report what was on the wire or reinpterpet what was reported by the server. In summary, the ftp server ran out of connections or had a limit on the number of connections an IP address could have. The administrator was told about this and the FTP server configuration was adjusted to allow more connections. ... https://www.youtube.com/watch?v=zJoeYugcvTA

I get occasional emails or messages to produce some updated Wireshark quickstart videos ranging from basic navigation, how I configure Wireshark to troubleshooting scenarios. I went back and was surprised that some of my Wireshark quickstart tutorials are 2 -- 4 years old. So time to refresh some of the basics and provide some tips and tricks along the way. In this video I review the Preferences pane in Wireshark. If you use Wireshark regularly, you should be familiar with screen to modify important options, such as your pane layout or default interfaces. I could have produced a 30 min all encompassing video, but many of you have told me that you prefer my many smaller, specific videos instead. That way you can choose a specific topic, knowing that within a few minutes you'll be done. Enjoy. ... https://www.youtube.com/watch?v=z9zSxGWOS3M