# HG changeset patch
# User Alessio Caiazza <nolith@abisso.org>
# Date 1257961754 -3600
# Node ID 5e5a1b42454d3663472f3b1b4624a31d8ba35a86
# Parent  9a713a4a8f6d6b06930504f616245268bcf9ba20
connetività, tb ed esercizi

diff -r 9a713a4a8f6d6b06930504f616245268bcf9ba20 -r 5e5a1b42454d3663472f3b1b4624a31d8ba35a86 Presentazione.tex
--- a/Presentazione.tex	Fri Nov 06 17:54:31 2009 +0100
+++ b/Presentazione.tex	Wed Nov 11 18:49:14 2009 +0100
@@ -1138,7 +1138,19 @@
 
 % section automatismi_e_routing (end)
 
-\section{Tunneling} % (fold)
+\section{Connettività}
+\begin{frame}
+  \frametitle{Connettività IPv6}
+  Un nodo configurato per IPv6 può essere di tre tipi.
+
+  \begin{description}
+  \item[tunnel] la connettivit\`a IPv4 \`e nativa, mentre quella IPv6 si ottiene attraverso un tunnel IPv4.
+  \item[IPv6 only] il nodo ha connettivit\`a IPv6 nativa e non ha lo stack protocollare IPv4
+  \item[dual-stack] il nodo ha entrambi gli stack protocolari attivi in modalit\`a nativa.
+  \end{description}
+\end{frame}
+
+\subsection{Tunneling} % (fold)
 \begin{frame}[t]\frametitle{Tunneling}
 \begin{colorblock}{Scopo}
 	Le tecniche di tunneling consentono di bypassare tronconi della rete che non 
@@ -1237,9 +1249,93 @@
   \end{bytefield}
 }
 \end{frame}
-% section tunneling (end)
+
+\subsection{IPv6 only}
+\begin{frame}
+  \frametitle{IPv6 only}
+  \begin{colorblock}{Solo IPv6? Siamo sicuri?}
+    \begin{itemize}
+    \item<2->I tempi non sono ancora maturi per una rete
+      esclusivamente IPv6.  Si resterebbe tagliati fuori da tutta
+      l'attuale infrastruttura IPv4.
+
+    \item<3-> Rimane comunque evidente il fatto che in futuro la
+      maggioranza degli host saranno esclusivamente IPv6. \pause
+
+    \item<4-> Tuttavia esiste una tecnica, chiamata NAT-PT, che
+      permette ad una rete IPv6 only di comunicare con gli host IPv4. 
+    \end{itemize}
+  \end{colorblock}
+\end{frame}
+\begin{frame}
+  \frametitle{IPv6 only NAT-PT}
+  \begin{colorblock}{Schema NAT-PT} 
+    \include{nat-pt}
+  \end{colorblock}
+  \vspace{.25cm} \pause
+
+\begin{colorblock}{Funzionamento}
+\only<presentation:2>{Il gateway NAT-PT far\`a advertising di un prefix fittizio di
+  dimensione 96 bit e convertirà tutte le risposte del server DNS che
+  contengono solo record IPv4 in record IPv6 costruiti accodando al
+  prefisso in questione l'indirizzo IPv4 convertito in forma
+  esadecimale.}  
+\only<presentation:3>{Quando Alice vorrà comunicare con Bob, manderà un
+  pacchetto all'indirizzo IPv6
+  alterato dal gateway.}
+\only<presentation:4>{
+  Il gateway~NAT-PT, una volta ricevuto il pacchetto, lo tradurr\`a in
+  uno IPv4 assegnando ad Alice una porta ed un IP dalla rete
+  \texttt{78.134.19.0/24},
+  similmente a ciò che avviene per le reti private IPv4.}
+\only<presentation:5>{
+  Quando Bob risponder\`a al pacchetto il gateway si preoccuper\`a di
+  fare l'operazione inversa garantendo cos\`i la comunicazione fra la
+  rete solo IPv6 e la rete solo IPv4.}
+\end{colorblock}
+\end{frame}
 
 \begin{frame}
+  \frametitle{IPv6 only NAT-PT (cont.)}
+  \begin{colorblock}{C'\`e qualcosa di strano...}
+    \pause Se ci fermiamo un attimo a riflettere sulla struttura del
+    NAT-PT ci verr\`a subito in mente che se uno dei vantaggi di IPv6
+    \`e la rimozione dei NAT, \textbf{che senso ha introdurre una
+      nuova tecnologia di NAT? Nessuno!} Infatti il NAT-PT viene
+    sconsigliato a meno di installazioni particolari in cui i nodi non
+    implementano lo stack IPv4.
+    
+  \end{colorblock}
+\end{frame}
+
+\subsection{Dual-stack}
+\begin{frame}
+  \frametitle{Dual-stack}
+  Un nodo dual-stack implementa in modo nativo entrambe le versioni del
+  protocollo IP.  \pause
+
+  \begin{colorblock}{Contro}
+    \begin{itemize}
+    \item<2-> doppia tabella di routing
+    \item<3-> doppie libreria di sistema per il networking
+    \item<4-> doppie utility di sistema per la gestione della rete
+      (ping/ping6, traceroute/traceroute6, \ldots)
+    \end{itemize}
+  \end{colorblock}
+  \pause
+
+  \begin{colorblock}{Pro}
+    \begin{itemize}
+    \item<5-> nessuna necessit\`a di sw per la gestione dei tunnel
+    \item<6-> possibilit\`a di raggiungere sia servizi IPv6 che IPv4
+      senza complicare la struttura della rete (vedi NAT-PT)
+    \item<7-> tutti i \emph{contro} citati sono irrilevanti sui
+      computer in commercio oggi
+    \end{itemize}
+  \end{colorblock}
+\end{frame}
+\begin{frame}
+
 \frametitle{Firewall}
 \begin{colorblock}{IPv4 e NAT $\rightarrow$ IPv6 e \texttt{Global Unicast}}
 \tikzstyle{na} = [baseline=-.5ex]
@@ -1482,6 +1578,47 @@
 \end{tikzpicture}
 \end{frame}
 
+\begin{frame}
+  \frametitle{Fare pratica con IPv6}
+  I tunnel broker che ci possono permettre di provare IPv6 anche se il
+  nostro ISP ancora non ce lo fornisce.  \pause
+
+  \begin{colorblock}{SixXS - \url{http://www.sixxs.net}}
+    \begin{itemize}
+    \item POP anche in Italia
+    \item il primo tunnel è un \texttt{/128}
+    \item sistema a punteggio (bisogna usarlo per bene)
+    \item con i punti si pu\`o richiedere un prefix \texttt{/48}
+    \item supporto per \texttt{proto-41} e \texttt{AYIYA}
+    \end{itemize}
+  \end{colorblock}
+  \begin{colorblock}{Hurricane Electric - \url{http://www.tunnelbroker.net}}
+    \begin{itemize}
+    \item scarsa presenza in Europa (tunnel broker americano)
+    \item ottieni subito un prefix \texttt{/64}
+    \item supportano solo \texttt{proto-41}
+    \end{itemize}
+  \end{colorblock}
+\end{frame}
+\begin{frame}
+  \frametitle{Certificazione IPv6}
+  \begin{colorblock}{Hurricane Electric IPv6 Certification}
+    Hurricane Electric prevede una certificazione gratuita e
+    divertente per mettere alla prova le proprie consocienze su
+    IPv6. Inizialmente baster\`a collegarsi in IPv6 al sito per
+    ottenere i primi livelli, successivamente si dov\`a dimostrare di
+    gestire un webserver IPv6 e di ricevre email inviate tramite IPv6.
+  \end{colorblock}
+  \begin{columns}
+    \column{.5\textwidth} Il sito per la certificazione è \\
+    \url{http://ipv6.he.net/certification/}.
+
+    \column{.5\textwidth}
+    \includegraphics[width=\textwidth]{certificato}
+  \end{columns}
+
+\end{frame}
+
 \section*{Licenza}
 \begin{frame}\frametitle{Licenza Creative Commons\newline{}\small Attribuzione-Non commerciale-Condividi allo stesso modo 2.5 Italia}
 \small
diff -r 9a713a4a8f6d6b06930504f616245268bcf9ba20 -r 5e5a1b42454d3663472f3b1b4624a31d8ba35a86 immagini/certificato.pdf
Binary file immagini/certificato.pdf has changed
diff -r 9a713a4a8f6d6b06930504f616245268bcf9ba20 -r 5e5a1b42454d3663472f3b1b4624a31d8ba35a86 nat-pt.tex
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nat-pt.tex	Wed Nov 11 18:49:14 2009 +0100
@@ -0,0 +1,448 @@
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+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
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+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
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+{
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetfillcolor{dialinecolor}
+% was here!!!
+\pgfsetarrowsstart{stealth}
+\pgfsetarrowsend{stealth}
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
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+}
+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
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+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
+\node[anchor=west] at (16.750000\du,11.700000\du){2001:db8:dead::ffff};
+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
+\node[anchor=west] at (16.750000\du,12.500000\du){indirizzi assegnati 78.134.19.0/24};
+\pgfsetlinewidth{0.100000\du}
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+\pgfsetdash{}{0pt}
+\pgfsetbuttcap
+{
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetfillcolor{dialinecolor}
+% was here!!!
+\pgfsetarrowsstart{stealth}
+\pgfsetarrowsend{stealth}
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
+\draw (19.600000\du,8.600000\du)--(29.228761\du,8.583989\du);
+}
+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
+\node[anchor=west] at (14.650000\du,7.800000\du){IPv6};
+% setfont left to latex
+\definecolor{dialinecolor}{rgb}{0.000000, 0.000000, 0.000000}
+\pgfsetstrokecolor{dialinecolor}
+\node[anchor=west] at (24.950000\du,7.700000\du){IPv4};
+\end{tikzpicture}