Fix some discussed points
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slides.tex
86
slides.tex
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@ -30,7 +30,7 @@ routing protocol}
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\href{https://datatracker.ietf.org/doc/draft-bastian-babel-v4ov6/}{
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draft-bastian-babel-v4ov6}}
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\author[\slidecountline]
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{Théophile Bastian, Juliusz Chroboczek}
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{Théophile Bastian, joint work with Juliusz Chroboczek}
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\date{}
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%\subject{}
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%\logo{}
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@ -44,29 +44,30 @@ draft-bastian-babel-v4ov6}}
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\maketitle{}
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\begin{frame}{Traditional routing}
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\begin{align*}
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\text{Network prefix (IPvX)} \quad &\longrightarrow
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\quad \text{Next-Hop (IPvX)}
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\end{align*}
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\pause{}
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\begin{table}
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\centering
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\textbf{IPv4 routing table} \\
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\medskip
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\begin{tabular}{@{} lcl @{}}
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\toprule
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Prefix & $\rightarrow$ & Next-Hop \\
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Network Prefix (IPvX) & $\rightarrow$ & Next-Hop (IPvX)\\
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\midrule
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default & & 10.42.0.254 \\
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10.102.0.0/16 & & 10.102.0.1 \\
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10.102.10.0/24 & & 10.102.10.1 \\
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\only<3>{10.0.0.0/8 & & % \makebox[0pt]{\color{red}---}
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\xcancel{fd80:1::1}} \\
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10.102.0.0/24 & & 10.102.0.2 \\
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10.0.0.0/8 & & \xcancel{fd80:1::1} \\
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\bottomrule
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\end{tabular}
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\end{table}
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\vspace{1em}
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\begin{itemize}
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\item \textbf{Control plan:} \alert{babel}, routing protocol.
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\alert{Fills the routing table}.
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\item \textbf{Data plan:} correctly forward incoming packets.
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\alert{Uses the routing table}.
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\end{itemize}
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\end{frame}
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\begin{frame}{The router's job}
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@ -76,7 +77,7 @@ draft-bastian-babel-v4ov6}}
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\end{figure}
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\end{frame}
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\begin{frame}{What's under the hull?}
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\begin{frame}{What's under the hood?}
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\begin{figure}
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\centering
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\only<1>{\includegraphics[width=\columnwidth]{imgs/_autogen/mac/01.pdf}}
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@ -93,7 +94,12 @@ draft-bastian-babel-v4ov6}}
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\end{figure}
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\end{frame}
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\begin{frame}{Why would we want this?}
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\begin{frame}{The idea behind}
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\textbf{New type of route!} v4 prefix with v6 next-hop: \alert{v4-over-v6
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route}.
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\vspace{2em}
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\begin{itemize}
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\item Supporting both v4 and v6 is cumbersome: twice the configuration
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\item v6-only core, still serve v4 to clients
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@ -103,15 +109,27 @@ draft-bastian-babel-v4ov6}}
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\item no need for DHCP or IP addresses configuration \emph{at all}!
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\end{itemize}
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\end{itemize}
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\vspace{2em}
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\textbf{Not an original idea!} BGP had it first:
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\href{https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision/}{draft-ietf-bess-rfc5549revision}
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\end{frame}
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\begin{frame}[fragile]{Supported in Linux since 5.2 --~July 2019}
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\begin{block}{d1566268 -- 2019-04-05 -- ipv4: Allow ipv6 gateway with ipv4 routes}
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\quad{}Add support for \lstbash{RTA_VIA} and allow an IPv6 nexthop for v4
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routes.
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\end{block}
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\begin{frame}[fragile]{Linux support}
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\textbf{Supported in Linux} since 5.2 --~July 2019!
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\vspace{1em}
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\begin{minipage}[c]{0.1\textwidth}
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\includegraphics[height=1.2em]{imgs/Git-Logo-1788C}
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\end{minipage}
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\begin{minipage}[c]{0.85\textwidth}
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\begin{block}{d1566268 -- 2019-04-05 -- ipv4: Allow ipv6 gateway with ipv4 routes}
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\quad{}Add support for \lstbash{RTA_VIA} and allow an IPv6 nexthop for v4
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routes.
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\end{block}
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\end{minipage}
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\vspace{2em}
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\begin{itemize}
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\item{} Usually, add a v4 route with
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@ -141,6 +159,17 @@ draft-bastian-babel-v4ov6}}
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\end{itemize}
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\end{frame}
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\begin{frame}{Backwards compatibility}
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\textbf{An unextended node must}
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\begin{itemize}
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\item Be able to \alert{ignore v4-over-v6 routes}
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\item \alert{Route correctly} pure v4 and v6
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\end{itemize}
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\todo{Choices considered}
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\end{frame}
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\begin{frame}{Introducing a new AE}
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In Babel, \alert{Address Encodings} (AEs) define the type of address/prefix
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contained in a TLV.
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@ -157,23 +186,6 @@ draft-bastian-babel-v4ov6}}
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introduced.
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\end{frame}
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\begin{frame}{Backwards compatibility}
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\textbf{With older implementations}
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\begin{itemize}
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\item Ignore v4-over-v6 routes
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\item No state updates missed
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\end{itemize}
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\vspace{2em}
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\textbf{With older kernels}
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\begin{itemize}
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\item Won't advertise a route that cannot be locally set
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\item In babeld, detect kernel version
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\end{itemize}
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\end{frame}
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%%%%%%%%%%% Conclusion frame %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\begin{frame}{}
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