remove interface name code

Chapters/Results.tex

@@ -2054,39 +2054,20 @@ running inside \texttt{tailscaled} itself (Tailscale SSH,
 Taildrop, the metric endpoint).  External processes such as
 iPerf3 cannot reach the Tailscale network in that mode.
 
-The test rig does not use that mode.
-Listing~\ref{lst:nixos_tailscale} shows the relevant line of
-the upstream NixOS \texttt{services.tailscale} module, which
-assembles the daemon command line as
-\texttt{tailscaled --tun
-\$\{cfg.interfaceName\}~\dots}, with
-no \texttt{userspace-networking} fall-back unless
-the operator
-explicitly sets \texttt{interfaceName =
-"userspace-networking"}.
-Listing~\ref{lst:rig_interface_name} shows what
-the benchmark
-suite's Headscale module sets the interface name to:
-\texttt{ts-\$\{instanceName\}}, truncated to fifteen
-characters.  The two together resolve to
-\texttt{tailscaled --tun ts-headscale} on every
-test machine,
-a real kernel TUN.  gVisor netstack is unreachable from any
-external benchmark traffic in this rig.
+The test rig does not use that mode.  As shown in
+Listing~\ref{lst:rig_interface_name}, the benchmark
+suite's Headscale module sets the interface name to
+\texttt{ts-\$\{instanceName\}}, resolving to
+\texttt{tailscaled --tun ts-headscale}: a real kernel
+TUN.  gVisor netstack is therefore unreachable from
+external benchmark traffic.
 
-\lstinputlisting[language=Nix,caption={The NixOS
-    \texttt{services.tailscale} module passes \texttt{--tun
-    \$\{interfaceName\}} as the daemon's TUN argument. There is
-    no \texttt{--tun=userspace-networking} fall-back unless the
-    user explicitly sets \texttt{interfaceName = "userspace-networking"}.
-\textit{nixpkgs/nixos/modules/services/networking/tailscale.nix:158}},label={lst:nixos_tailscale}]{Listings/nixos_tailscale.nix}
 
 \lstinputlisting[language=Nix,caption={The
     benchmark suite's
     Headscale module sets \texttt{interfaceName} to a real kernel
     TUN name (\texttt{ts-<instance>}, truncated to 15 characters).
-    Combined with Listing~\ref{lst:nixos_tailscale}, this means
-    \texttt{tailscaled} runs as \texttt{tailscaled --tun ts-headscale}
+    This means \texttt{tailscaled} runs as \texttt{tailscaled --tun ts-headscale}
     on every test machine.
 \textit{vpn-benchmark-suite/clanModules/headscale/shared.nix:19,273--277}},label={lst:rig_interface_name}]{Listings/rig_interface_name.nix}