+@table @option
+
+@item -mtu
+Expected TUN/TAP interface @ref{MTU}.
+
+@item -proto
+@ref{Network, Network protocol} to use. Can be either @emph{udp}
+(default) or @emph{tcp}.
+
+@item -proxy
+Use specified @emph{host:port} @ref{Proxy} server for accessing remote
+server.
+
+@item -proxy-auth
+Optional @emph{user:password} for HTTP Basic authorization on proxy
+server.