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”
Category Archives: Analysis
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”
802.11ac Encryption Upgrade
The security features provided by the IEEE 802.11 standard haven’t changed much since the 802.11i amendment was ratified in 2004, which is more commonly known by its Wi-Fi Alliance certification name WPA2. 802.11w protected management frames were introduced in 2009, but it is only recently that Wi-Fi chipsets for client devices have included support for it. WPA2Continue reading “802.11ac Encryption Upgrade”
Frame by Frame 