110 lines
4.5 KiB
TeX
110 lines
4.5 KiB
TeX
%** Introduction.tex: Contains an introduction to
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% the topic and motivates the work.
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% State what the reader can find where.
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%** Problem.tex: Documentation in own words of the problem to
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% be addressed in this document:
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% What is the challenge, why is it useful what you
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% plan to do.
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%% In \ref{introduction} we start with our introduction to the problem that we
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%% are going to address. Since we do not want to waste the readers time we
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%% go and show the essential issues of latex in section
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%% \ref{chapter2:essentials}.
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\chapter{\label{introduction}Introduction}
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In this chapter we give an introduction about the topic of the master
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thesis, the motivation and problemes that we address.
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% ----------------------------------------------------------------------
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\section{\label{introduction:ipv4ipv6}IPv4 exhaustion and IPv6 adoption}
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The Internet has almost completely run out of public IPv4 space. The
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5 Regional Internet Registries (RIRs) report IPv4 exhaustion world wide
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(\cite{ripe_exhaustion},
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\cite{apnic_exhaustion},
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\cite{lacnic:_ipv4_deplet_phases},
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\cite{afrinic:_afrin_ipv4_exhaus},
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\cite{arin:_ipv4_addres_option}) and LACNIC project complete
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exhaustion for 2020 (see figure \ref{fig:lacnicexhaust}).
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\begin{figure}[h]
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\includegraphics[scale=0.7]{lacnicdepletion}
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\centering
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\caption{LACNIC Exhaustion projection,
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\cite{lacnic:_ipv4_deplet_phases}}
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\label{fig:lacnicexhaust}
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\end{figure}
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On the other hand IPv6 adoption grows significantly, with at least
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three countries (India, US, Belgium) surpassing 50\% adoption
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(\cite{akamai:_ipv6_adopt_visual},
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\cite{vyncke:_ipv6_deploy_aggreg_status}).
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\cite{cisco:_ipv6}). Traffic from Google users reaches almost 30\% as
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of 2019-08-08 (\cite{google:_ipv6_googl}, see figure \ref{fig:googlev6}).
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\begin{figure}[h]
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\includegraphics[scale=0.2]{googlev6}
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\centering
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\caption{Google IPv6 Statistics,
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\cite{google:_ipv6_googl}}
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\label{fig:googlev6}
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\end{figure}
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We conclude that IPv6 is a technology strongly gaining importance with
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the IPv4 depletion that is estimated to be world wide happening in the
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next years. Thus more devices will be using IPv6, while communication
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to legacy IPv4 devices still needs to be provided.
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% ----------------------------------------------------------------------
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\section{\label{introduction:motivation}Motivation}
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IPv6 nodes and IPv4 nodes cannot directly connect to each other,
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because the protocols are incompatible to each other.
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To allow communication between different protocol nodes,
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several transition mechanism have been proposed
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\cite{wikipedia:_ipv6}, \cite{rfc4213}.
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However installation and configuration of the transition mechanism
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usually require in depth knowledge about both protocols and require
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additional hardware to be added in the network.
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In this thesis we show an in-network transition method based on NAT64
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\cite{rfc6146}. Compared to traditional NAT64 methods which require an
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extra device in the network, our proposed method is transparent to the
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user. This way neither the operator nor the end user has to configure
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extra devices. Figures \ref{fig:v6v4standard} shows the standard NAT64
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approach and \ref{fig:v6v4innetwork} shows our solution.
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\begin{figure}[h]
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\includegraphics[scale=0.7]{v6-v4-innetwork}
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\centering
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\caption{In Network NAT64 translation}
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\label{fig:v6v4innetwork}
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\end{figure}
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\begin{figure}[h]
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\includegraphics[scale=0.7]{v6-v4-standard}
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\centering
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\caption{Standard NAT64 translation}
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\label{fig:v6v4standard}
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\end{figure}
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Currently network operators have to focus on two network stacks when
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designing networks: IPv6 and IPv4. While in a small scale setup this
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might not introduce significant complexity, figure
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\ref{fig:v6v4mixed} shows how the complexity quickly grows
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with the number of hosts.
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\begin{figure}[h]
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\includegraphics[scale=0.4]{v6-v4-mixed}
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\centering
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\caption{Differenent network design with in network NAT64 translation}
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\label{fig:v6v4mixed}
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\end{figure}
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The in network solution does not only ease the installation and
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deployment of IPv6, but it also allows line speed translation, because
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it is compiled into target dependent low level code that can run in
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ASICs\cite{networks:_tofin},
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FPGAs\cite{netfpga:_p4_netpf_public_github}
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or even in software
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\cite{_implem_your_switc_target_with_bmv2}.
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Even on fast CPUs, software solutions like tayga
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\cite{lutchansky:_tayga_simpl_nat64_linux} can be CPU bound and are
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not capabale of translating protocols at line speed.
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