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+\documentclass{beamer}
+\usepackage{lmodern}
+\usepackage[czech]{babel}
+\usepackage[utf8x]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{textpos}
+\usepackage{tikz,calc}
+\usepackage{graphicx}
+\usepackage{wrapfig}
+\usepackage{color}
+\usepackage{mathtools}
+\usepackage{hyperref}
+\usepackage{epstopdf}
+\usepackage{amsmath}
+\hypersetup{
+	colorlinks,
+	citecolor=black,
+	filecolor=black,
+	linkcolor=black,
+	urlcolor=black
+}
+\usepackage{pdflscape}
+
+\input{theme/theme.tex}
+
+\title{Wifi roaming and open source}
+\author{Karel Kočí}
+\date{12.6.2018}
+
+\AtBeginSection[]{
+	\begin{frame}
+		\tableofcontents[currentsection]
+	\end{frame}
+}
+
+\begin{document}
+
+\input{theme/title.tex}
+
+\begin{frame}{802.11r}
+	\begin{itemize}
+		\item Extension to 802.11i (WPA2)
+		\item Allows AP switching in cooperation between both APs
+		\item Supplicant negotiates keys before AP switch
+		\item Usable when moving between access points
+		\item Only in same mobility domain
+		\item Communication between APs can be either over air or DS
+	\end{itemize}
+\end{frame}
+
+\begin{frame}{802.11r terminology}
+	\begin{itemize}
+		\item \textbf{R0KH} Derives keys for all R1KM in network
+		\item \textbf{R1KH} Derives PTK (Pairwise transient key)
+		\item \textbf{S0KH} in Supplicant derives R0 keys
+		\item \textbf{S1KH} in Supplicant derives with R1KH PTK
+	\end{itemize}
+	Both R0KH and R1KH communicate with authenticator
+
+	Another point: 802.11r (FT) is advertised
+\end{frame}
+
+\begin{frame}{Over-the-DS TF protocol (non-RSN)}
+	\includegraphics[width=10cm]{over-ds.png}
+
+	\tiny{Source: IEEE Standard (11:13.5.5,13-8)}
+\end{frame}
+
+\begin{frame}[fragile]{Setting it up (on OpenWRT)}
+	\begin{verbatim}
+option ieee80211r '1'
+option nasid '11'
+option r1_key_holder '04F021242480'
+list r0kh '04:F0:21:24:24:80,11,E1594C87BF2C30DA27E1C116C5683B90'
+list r0kh '04:F0:21:24:24:5E,12,903F4FFCC7907A6562B665B6721D5E1F'
+list r1kh '04:F0:21:24:24:80,04:F0:21:24:24:80,290856554F810E3D3D5C06DC5F82639E'
+list r1kh '04:F0:21:24:24:5E,04:F0:21:24:24:5E,F38D019B98BA8C8B559ED52A456083CC'
+	\end{verbatim}
+	\vspace{1cm}
+	\begin{verbatim}
+list r0kh 'BSSID,NASID,KEY'
+list r1kh 'BSSID,KEYHOLDER-ID,KEY'
+	\end{verbatim}
+\end{frame}
+
+\begin{frame}{Measurements}
+	\begin{itemize}
+		\item Two 5GHz APs with OpenWRT and configured 802.11r (hostapd, ath10k)
+		\item PC running iperf3 server
+		\item Laptop with wpa\_supplicant running iperf3 client in UDP mode
+		\item iperf3 configured for 600Mbits/sec
+	\end{itemize}
+\end{frame}
+
+\begin{frame}{Switching with roaming}
+	\includegraphics[width=10.7cm,trim=1cm 0 0 4cm]{with-r.pdf}
+\end{frame}
+
+\begin{frame}{Switching with roaming}
+	\includegraphics[width=10.7cm,trim=1cm 0 0 4cm]{with-r-close.pdf}
+\end{frame}
+
+\begin{frame}{Switching without roaming}
+	\includegraphics[width=10.7cm,trim=1cm 0 0 4cm]{no-r.pdf}
+\end{frame}
+
+\begin{frame}{Switching without roaming}
+	\includegraphics[width=10.7cm,trim=1cm 0 0 4cm]{no-r-close.pdf}
+\end{frame}
+
+\begin{frame}[fragile]{Real usability}
+	\begin{itemize}
+		\item \textbf{Android} Lowers threshold for switch
+		\item \textbf{Linux(wpa\_supplicant)} No effect (well..)
+	\end{itemize}
+
+	\begin{verbatim}
+	# mode:short scan:threshold:long scan
+	bgscan="simple:5:-50:300"
+	\end{verbatim}
+\end{frame}
+
+\begin{frame}[fragile]{Should we deploy it?}
+	Probably yes?
+
+	\vspace{5cm}
+
+	\textbf{Thank you for you attention}
+
+	Karel Kočí (@karel\_koci, karel.koci@nic.cz)
+\end{frame}
+
+\end{document}