Most guest Wi-Fi networks today are open SSID’s with no encryption that have a captive portal that requires users to click through some terms and conditions. It would be nice to be able to secure these networks the same way we do with internal SSID’s–mutual authentication of the client and network, and strong layer 2Continue reading “The State of Guest Wi-Fi Security”
Category Archives: WLAN
Roaming Analysis using only a Mac and Wireshark
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”
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”
Frame by Frame 