WLAN – Page 5 – Frame by Frame

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”

macOS Wi-Fi Roaming

One of the nice things about Intel wireless chipsets is that the drivers expose a lot of controls to help tune the chipset’s operation. One of my favorite of these controls is “Preferred Band,” which I usually adjust to instruct the chipset to prefer the 5 GHz band over the 2.4 GHz band. There areContinue reading “macOS Wi-Fi Roaming”

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”