566 lines
17 KiB
TeX
566 lines
17 KiB
TeX
%\documentclass[aspectratio=43]{beamer}
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\documentclass[c]{beamer}
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\usetheme{intridea} %% Themenwahl
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\usepackage[ngerman]{babel}
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\usepackage[T1]{fontenc} % richtige Silbentrennung
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\usepackage[utf8]{inputenc} % Umlaute etc.!
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\usepackage{eurosym}
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\usepackage{tikz}
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\usetikzlibrary{arrows,decorations.pathmorphing,backgrounds,fit,positioning,shapes.symbols,chains}
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%1
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\title{Freifunk Hamburg}
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\author{hamburg.freifunk.net}
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\date{2013/July/28}
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%2
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\begin{document}
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\maketitle
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\begin{frame}{What is freifunk?}
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\begin{itemize}
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\item an initiative for free, cost-free and open, wireless networks
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\item everyone may take part in freifunk as client, provider or both
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\item WiFi routers are access points to the freifunk network
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\item freifunk is available in many places (Berlin, Wien, Augsburg, Lübeck, Kiel, Rheinland, Hamburg...)
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\end{itemize}
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\end{frame}
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%3
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\begin{frame}{What is freifunk?}
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\textbf{Free} means
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\begin{itemize}
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\item pubic - accessible by everyone
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\item non-commercial
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\item community owned
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\item net neutrality - no manipulation of any data stream
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\end{itemize}
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\end{frame}
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%4
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\begin{frame}{History}
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\begin{itemize}
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\item in the early 2000s the fibre optic network in Berlin-Friedrichshain caused a demand for affordable broadband access
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\item Linksys WRT54g --> Harald Welte gpl-violations.org --> OpenWRT (Jan. 2004)
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\item development of various meshing protocols (OLSR, B.A.T.M.A.N., 802.11s...)
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\end{itemize}
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\begin{center}
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The combination of these three aspects resulted in the demand and the technical prerequesits for freifunk
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\end{center}
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\end{frame}
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%5
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\begin{frame}{How to access the Internet}
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\includegraphics[height=180pt]{Bilder/Knotenanbindung_en}
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\end{frame}
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%6
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\begin{frame}{Project Goals}
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\begin{itemize}
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\item spreading open wireless networks
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\item minimize access barriers to the net
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\item push people's sensitivity on freedom of information
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\item enable people to build their own networks
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\item form and support social structures
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\end{itemize}
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\end{frame}
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%7
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\begin{frame}{Demo}
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\begin{itemize}
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\item node map \href{http://knotenkarte.de/}{http://knotenkarte.de/}
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\end{itemize}
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\end{frame}
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%8
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\begin{frame}{Why WiFi?}
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\begin{itemize}
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\item high data rate mobile solution
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\item hardware and maintenance are reasonably priced (router starting at \EUR{15}, energy for less than \EUR{10} p.a.)
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\item WiFi can be used where no wiring is available / too pricy
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\end{itemize}
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\end{frame}
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%9
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\begin{frame}{Range}
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\begin{center}
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\includegraphics[height=180pt]{Bilder/Reichweite_altona001}
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\end{center}
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\end{frame}
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%10
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\begin{frame}{Mesh}
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What is a mesh?
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\begin{itemize}
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\item self-organizing network
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\item every router is automatically part of the network
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\item hamburg.freifunk.net features the B.A.T.M.A.N.-adv. protocol
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\end{itemize}
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Two SSIDs
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\begin{itemize}
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\item freifunk access: hamburg.freifunk.net
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\item mashing (adhoc): f8:d1:11:87:52:2e
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\end{itemize}
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--> \it Demo [inSSIDer]
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\end{frame}
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%11
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\begin{frame}{Mesh}
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\begin{center}
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\begin{tikzpicture}
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\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\tikzstyle{vertex}=[circle, draw, color=outerCircleColour, ultra thick, minimum size=84pt]
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\tikzstyle{place}=[circle, draw, color=innerCircleColour, fill=innerCircleColour, minimum size=6pt, inner sep=0pt]
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\node [vertex] (a) {};
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\node [vertex, xshift=68pt, yshift=24pt] (b) {};
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\node [vertex, xshift=112pt, yshift=-20pt] (c) {};
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\node [place, label=above:$A$] (A) {};
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\node [place, xshift=68pt, yshift=24pt, label=above:$B$] (B) {};
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\node [place, xshift=112pt, yshift=-20pt, label=right:$C$] (C) {};
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\path[-, thick, color=gray]
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(A) edge (B)
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(B) edge (C);
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%12
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\begin{frame}{Mesh}
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\begin{center}
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\begin{tikzpicture}
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\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\tikzstyle{vertex}=[circle, draw, color=outerCircleColour, ultra thick, minimum size=84pt]
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\tikzstyle{place}=[circle, draw, color=innerCircleColour, fill=innerCircleColour, minimum size=6pt, inner sep=0pt]
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\node [vertex] (a) {};
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\node [vertex, xshift=68pt, yshift=24pt] (b) {};
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\node [vertex, xshift=112pt, yshift=-20pt] (c) {};
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\node [place, label=above:$A$] (A) {};
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\node [place, xshift=68pt, yshift=24pt, label=above:$B$] (B) {};
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\node [place, xshift=112pt, yshift=-20pt, label=right:$C$] (C) {};
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\path[-, thick, color=gray]
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(A) edge (B)
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(B) edge (C)
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(A) edge[dashed] (C);
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%13
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\begin{frame}{Network Is Growing}
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\begin{center}
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\begin{tikzpicture}
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\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\tikzstyle{vertex}=[circle, draw, color=outerCircleColour, ultra thick, minimum size=40pt]
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\tikzstyle{place}=[circle, draw, color=innerCircleColour, fill=innerCircleColour, minimum size=7pt, inner sep=0pt]
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\node [vertex] (a) {};
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\node [vertex, xshift=15pt, yshift=30pt] (b) {};
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\node [vertex, xshift=65pt, yshift=5pt] (c) {};
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\node [vertex, xshift=33pt, yshift=-3pt] (d) {};
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\node [vertex, xshift=85pt, yshift=-25pt] (e) {};
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\node [vertex, xshift=100pt, yshift=2pt] (f) {};
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\node [vertex, xshift=91pt, yshift=32pt] (g) {};
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\node [vertex, xshift=110pt, yshift=-52pt] (h) {};
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\node [vertex, xshift=124pt, yshift=23pt] (i) {};
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\node [vertex, xshift=134pt, yshift=-7pt] (j) {};
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\node [vertex, xshift=164pt, yshift=-14pt] (k) {};
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||
\node [vertex, xshift=144pt, yshift=-66pt] (l) {};
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\node [vertex, xshift=170pt, yshift=-46pt] (m) {};
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\node [vertex, xshift=201pt, yshift=-59pt] (n) {};
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||
\node [place] (A) {};
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\node [place, xshift=15pt, yshift=30pt] (B) {};
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\node [place, xshift=65pt, yshift=5pt] (C) {};
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\node [place, xshift=33pt, yshift=-3pt] (D) {};
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\node [place, xshift=85pt, yshift=-25pt] (E) {};
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\node [place, xshift=100pt, yshift=2pt] (F) {};
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\node [place, xshift=91pt, yshift=32pt] (G) {};
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\node [place, xshift=110pt, yshift=-52pt] (H) {};
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\node [place, xshift=124pt, yshift=23pt] (I) {};
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\node [place, xshift=134pt, yshift=-7pt] (J) {};
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\node [place, xshift=164pt, yshift=-14pt] (K) {};
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\node [place, xshift=144pt, yshift=-66pt] (L) {};
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\node [place, xshift=170pt, yshift=-46pt] (M) {};
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\node [place, xshift=201pt, yshift=-59pt] (N) {};
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||
\path[-, thick, color=gray]
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||
(A) edge (B)
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(A) edge (D)
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(B) edge (D)
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(C) edge (D)
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(C) edge (E)
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(C) edge (F)
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(C) edge (G)
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(E) edge (F)
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(E) edge (H)
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(F) edge (G)
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(F) edge (I)
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(F) edge (J)
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(G) edge (I)
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(H) edge (L)
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(I) edge (J)
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(J) edge (K)
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(K) edge (M)
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(L) edge (M)
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(M) edge (N);
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\end{tikzpicture}
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\end{center}
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\end{frame}
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%14
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\begin{frame}{Networks Are Interconnecting}
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\begin{columns}[c]
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\begin{column}[l]{.4\textwidth}
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\scalebox{0.6}[0.6]{
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\begin{tikzpicture}
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\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\tikzstyle{vertex}=[circle, draw, color=outerCircleColour, ultra thick, minimum size=40pt]
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\tikzstyle{place}=[circle, draw, color=innerCircleColour, fill=innerCircleColour, minimum size=7pt, inner sep=0pt]
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\node [vertex] (a) {};
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\node [vertex, xshift=15pt, yshift=30pt] (b) {};
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\node [vertex, xshift=65pt, yshift=5pt] (c) {};
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\node [vertex, xshift=33pt, yshift=-3pt] (d) {};
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\node [vertex, xshift=85pt, yshift=-25pt] (e) {};
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\node [vertex, xshift=100pt, yshift=2pt] (f) {};
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\node [vertex, xshift=91pt, yshift=32pt] (g) {};
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\node [vertex, xshift=110pt, yshift=-52pt] (h) {};
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\node [vertex, xshift=124pt, yshift=23pt] (i) {};
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\node [vertex, xshift=134pt, yshift=-7pt] (j) {};
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\node [vertex, xshift=164pt, yshift=-14pt] (k) {};
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\node [vertex, xshift=144pt, yshift=-66pt] (l) {};
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\node [vertex, xshift=170pt, yshift=-46pt] (m) {};
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\node [vertex, xshift=201pt, yshift=-59pt] (n) {};
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\node [place] (A) {};
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\node [place, xshift=15pt, yshift=30pt] (B) {};
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\node [place, xshift=65pt, yshift=5pt] (C) {};
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\node [place, xshift=33pt, yshift=-3pt] (D) {};
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\node [place, xshift=85pt, yshift=-25pt] (E) {};
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\node [place, xshift=100pt, yshift=2pt] (F) {};
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\node [place, xshift=91pt, yshift=32pt] (G) {};
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\node [place, xshift=110pt, yshift=-52pt] (H) {};
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\node [place, xshift=124pt, yshift=23pt] (I) {};
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\node [place, xshift=134pt, yshift=-7pt] (J) {};
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\node [place, xshift=164pt, yshift=-14pt] (K) {};
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\node [place, xshift=144pt, yshift=-66pt] (L) {};
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\node [place, xshift=170pt, yshift=-46pt] (M) {};
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\node [place, xshift=201pt, yshift=-59pt] (N) {};
|
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|
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\path[-, thick, color=gray]
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(A) edge (B)
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(A) edge (D)
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(B) edge (D)
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(C) edge (D)
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(C) edge (E)
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(C) edge (F)
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(C) edge (G)
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(E) edge (F)
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(E) edge (H)
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(F) edge (G)
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(F) edge (I)
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(F) edge (J)
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(G) edge (I)
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(H) edge (L)
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(I) edge (J)
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(J) edge (K)
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||
(K) edge (M)
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(L) edge (M)
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||
(M) edge (N);
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||
\end{tikzpicture}}
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\end{column}
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\begin{column}{0.185\textwidth}
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\begin{uncoverenv}<2->
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||
\begin{tikzpicture}
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||
\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\draw[color=white] (280pt, 85pt) arc (0:0:0pt);
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\draw[color=white] (-180pt, 85pt) arc (0:0:0pt);
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\draw[color=outerCircleColour, thick, xshift=-50pt, yshift=9pt] (-110pt, 0pt) arc (270:450:6pt);
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\draw[color=outerCircleColour, thick, xshift=-50pt, yshift=11pt] (-110pt, 0pt) arc (270:450:4pt);
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\draw[color=outerCircleColour, thick, xshift=-50pt, yshift=13pt] (-110pt, 0pt) arc (270:450:2pt);
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\draw[color=outerCircleColour, thick, xshift=-9pt, yshift=21pt] (-110pt, 0pt) arc (90:270:6pt);
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\draw[color=outerCircleColour, thick, xshift=-9pt, yshift=19pt] (-110pt, 0pt) arc (90:270:4pt);
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\draw[color=outerCircleColour, thick, xshift=-9pt, yshift=17pt] (-110pt, 0pt) arc (90:270:2pt);
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\draw[color=gray, ultra thick, xshift=-50pt, yshift=15] (-103pt, 0pt) edge[dashed] (-74pt, 0pt);
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\end{tikzpicture}
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\end{uncoverenv}
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\end{column}
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\begin{column}[r]{.5\textwidth}
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||
\reflectbox{
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||
\scalebox{0.6}[0.6]{
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\begin{tikzpicture}
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\definecolor{outerCircleColour}{RGB}{220, 0, 103}
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\definecolor{innerCircleColour}{RGB}{255, 203, 18}
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\tikzstyle{vertex}=[circle, draw, color=outerCircleColour, ultra thick, minimum size=40pt]
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\tikzstyle{place}=[circle, draw, color=innerCircleColour, fill=innerCircleColour, minimum size=7pt, inner sep=0pt]
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\node [vertex] (a) {};
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\node [vertex, xshift=15pt, yshift=30pt] (b) {};
|
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\node [vertex, xshift=65pt, yshift=5pt] (c) {};
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\node [vertex, xshift=33pt, yshift=-3pt] (d) {};
|
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\node [vertex, xshift=85pt, yshift=-25pt] (e) {};
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\node [vertex, xshift=100pt, yshift=2pt] (f) {};
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\node [vertex, xshift=91pt, yshift=32pt] (g) {};
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\node [vertex, xshift=110pt, yshift=-52pt] (h) {};
|
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\node [vertex, xshift=124pt, yshift=23pt] (i) {};
|
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\node [vertex, xshift=134pt, yshift=-7pt] (j) {};
|
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\node [vertex, xshift=164pt, yshift=-14pt] (k) {};
|
||
\node [vertex, xshift=144pt, yshift=-66pt] (l) {};
|
||
\node [vertex, xshift=170pt, yshift=-46pt] (m) {};
|
||
\node [vertex, xshift=201pt, yshift=-59pt] (n) {};
|
||
|
||
\node [place] (A) {};
|
||
\node [place, xshift=15pt, yshift=30pt] (B) {};
|
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\node [place, xshift=65pt, yshift=5pt] (C) {};
|
||
\node [place, xshift=33pt, yshift=-3pt] (D) {};
|
||
\node [place, xshift=85pt, yshift=-25pt] (E) {};
|
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\node [place, xshift=100pt, yshift=2pt] (F) {};
|
||
\node [place, xshift=91pt, yshift=32pt] (G) {};
|
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\node [place, xshift=110pt, yshift=-52pt] (H) {};
|
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\node [place, xshift=124pt, yshift=23pt] (I) {};
|
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\node [place, xshift=134pt, yshift=-7pt] (J) {};
|
||
\node [place, xshift=164pt, yshift=-14pt] (K) {};
|
||
\node [place, xshift=144pt, yshift=-66pt] (L) {};
|
||
\node [place, xshift=170pt, yshift=-46pt] (M) {};
|
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\node [place, xshift=201pt, yshift=-59pt] (N) {};
|
||
|
||
\path[-, thick, color=gray]
|
||
(A) edge (B)
|
||
(A) edge (D)
|
||
(B) edge (D)
|
||
(C) edge (D)
|
||
(C) edge (E)
|
||
(C) edge (F)
|
||
(C) edge (G)
|
||
(E) edge (F)
|
||
(E) edge (H)
|
||
(F) edge (G)
|
||
(F) edge (I)
|
||
(F) edge (J)
|
||
(G) edge (I)
|
||
(H) edge (L)
|
||
(I) edge (J)
|
||
(J) edge (K)
|
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(K) edge (M)
|
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(L) edge (M)
|
||
(M) edge (N);
|
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\end{tikzpicture}}}
|
||
\end{column}
|
||
\end{columns}
|
||
\end{frame}
|
||
|
||
|
||
%15
|
||
\begin{frame}{An Example in Wilhelmsburg}
|
||
\begin{center}
|
||
\includegraphics[width=0.9\textwidth]{Bilder/wilhelmsburg}
|
||
\end{center}
|
||
\end{frame}
|
||
|
||
|
||
%16
|
||
\begin{frame}{Security}
|
||
\begin{itemize}
|
||
\item Since freifunk uses no password, the connection over the air is unencrypted - just like any other open network
|
||
\item It is recommended to make use of encrypted protocols (https://, ftps://, ssh, our your own VPN) – just like anywhere else on the internet
|
||
\item Connections to the gateways are encrypted (fastd) --> no access to the home network possible
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%17
|
||
\begin{frame}{Störerhaftung (liability for disturbance)}
|
||
\begin{itemize}
|
||
\item access points do not directly route traffic into the internet
|
||
\item a fastd encrypted connection (VPN) to the gateways is set up over the internet
|
||
\item even the gateways do not directly drop their traffic into the internet, but VPN it abroad
|
||
\end{itemize}
|
||
Consequences:
|
||
\begin{itemize}
|
||
\item \begin{it}Advantage\end{it}: Störerhaftung cannot be enforced
|
||
\item \begin{it}Disadvantage\end{it}: limited bandwith due to encryption effort (ca. 6Mb/s on smaller router models)
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%18
|
||
\begin{frame}{Community Agreement}
|
||
\begin{itemize}
|
||
\item be fair!
|
||
\item whatchout for your security!
|
||
\item don't do anything unlawful!
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%19
|
||
\begin{frame}{Devices}
|
||
Hardware requirement for Hamburg's freifunk software
|
||
\begin{itemize}
|
||
\item supporting OpenWRT \begin{it}Attitude Adjustment\end{it}
|
||
\item 4 MB flash, 32 MB RAM
|
||
\item It is highly recommended to use routers w/ a current Atheros wireless chip (ath9k-drive, 802.11n-enabled) - they support meshing very well
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
|
||
%20
|
||
\begin{frame}{Devices}
|
||
\begin{columns}[c]
|
||
\begin{column}{0.5\textwidth}
|
||
\begin{itemize}
|
||
\item TP-Link 741nd (starting at \EUR{15})
|
||
\item TP-Link 841nd
|
||
\item TP-Link 842nd (starting at \EUR{25})
|
||
\begin{itemize}
|
||
\item Atheros AR7241 SOC
|
||
\item 8 MB flash
|
||
\item 32MB RAM
|
||
\item 300Mbit/s
|
||
\end{itemize}
|
||
\item TP-Link 1043nd
|
||
\item TP-Link 3600
|
||
\end{itemize}
|
||
\end{column}
|
||
\begin{column}{0.5\textwidth}
|
||
\begin{center}
|
||
\includegraphics[height=150pt]{741nd}
|
||
\end{center}
|
||
\end{column}
|
||
\end{columns}
|
||
\end{frame}
|
||
|
||
|
||
%21
|
||
\begin{frame}{Services}
|
||
Implemented
|
||
\begin{itemize}
|
||
\item internet
|
||
\item city-wide intranet (IPv4 \& IPv6)
|
||
\end{itemize}
|
||
Partially Implemented
|
||
\begin{itemize}
|
||
\item IC-VPN, Chaos-VPN, DN42...
|
||
\end{itemize}
|
||
Yet to Be Implemented
|
||
\begin{itemize}
|
||
\item DNS (for the intranet)
|
||
\item voice over IP (SIP)
|
||
\item anythign else you would like to offer...
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%22
|
||
\begin{frame}{Network topology}
|
||
Currently five gateways / DHCP-servers
|
||
|
||
Intranet IP ranges
|
||
\begin{itemize}
|
||
\item v4 RFC 1918 range: 10.112.0.0/16
|
||
\item v6 Unique Local Unicast range: fd51:2bb2:fd0d::/48
|
||
\end{itemize}
|
||
VPN tunnel to \href{https://www.mullvad.net/}{https://www.mullvad.net/}
|
||
\end{frame}
|
||
|
||
|
||
%23
|
||
\begin{frame}{Demo}
|
||
\begin{itemize}
|
||
\item Checking out / OpenWRT \it Attitude Adjustment
|
||
\item Node statistics at \href{http://www.ohrensessel.net/ffhh/}{http://www.ohrensessel.net/ffhh/}
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%24
|
||
\begin{frame}{Outlook}
|
||
\begin{itemize}
|
||
\item increasing number of access points in cafés, restaurants, etc.
|
||
\item cooperations w/ the city of Hamburg (WiFi in parks, tourism...)
|
||
\item cooperation w/ public transportation (HVV)
|
||
\item universities, student union
|
||
\item ...
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%25
|
||
\begin{frame}{Projects}
|
||
\begin{itemize}
|
||
\item customizing antennas
|
||
\item outdoor housings
|
||
\item solar-powered routers
|
||
\item flash workshops
|
||
\item PPPoE
|
||
\item private wireless network
|
||
\item uplink over wireless
|
||
\item remote monitoring and updates of nodes
|
||
\item setting up a mail server on srv01
|
||
\item form to alter your own router settings in the DB
|
||
\item ...
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%26
|
||
\begin{frame}{How Can I Participate?}
|
||
\begin{itemize}
|
||
\item freifunk is open to everyone - no technical expertise required
|
||
\item become part of the network by setting up a router
|
||
\item meet up Monday's at 19:00 at the CCCHH
|
||
\item promote the idea!
|
||
\end{itemize}
|
||
\end{frame}
|
||
|
||
|
||
%27
|
||
\begin{frame}{Thatks for Your Attention!}
|
||
\begin{columns}
|
||
\begin{column}{0.6\textwidth}
|
||
\begin{itemize}
|
||
\item web hamburg.freifunk.net
|
||
\item mail: kontakt@hamburg.freifunk.net
|
||
\end{itemize}
|
||
\end{column}
|
||
\begin{column}{0.5\textwidth}
|
||
\begin{center}
|
||
\includegraphics[width=0.5\textwidth]{Bilder/cc-by}
|
||
\end{center}
|
||
\end{column}
|
||
\end{columns}
|
||
\end{frame}
|
||
|
||
\end{document} |