There are many ways to examine the roaming performance of a Wi-Fi client. Perhaps the gold standard is to follow the client with a laptop running Omnipeek and several Wi-Fi adapters all capturing frames on different channels. I’m also impressed with 7signal’s recent update to Mobile Eye which now logs roaming data as well. ButContinue reading “Roaming Analysis using only a Mac and Wireshark”
Category Archives: Analysis
Beware of mDNS Floods from Buggy Android Clients
Recently, I discovered a large increase in multicast traffic on an enterprise Cisco WLAN. This increase was large enough to cause packet loss in several areas where bandwidth is limited, usually at the WAN edge. While throughput remained within the acceptable range for a circuit, an extremely high packet rate was overwhelming the edge device’sContinue reading “Beware of mDNS Floods from Buggy Android Clients”
Splunking Wi-Fi DFS Events
One aspect of wireless networking that I’ve always struggled with is visibility into DFS events. Usually I catch them by chance by noticing two nearby AP’s on a site map using the same non-DFS channel, or maybe by casually looking through logs, but I’ve never felt like I had the reporting and alerting that should be inContinue reading “Splunking Wi-Fi DFS Events”
Frame by Frame 