\subsection*{NAME}

\noindent ARP (Address Resolution Protocol)

\subsection*{SPECIFICATION}

\noindent D. Plummer. {\it An Ethernet Address Resolution Protocol}.
Request for Comments 826, USC Information Sciences Institute, Marina
del Ray, Calif., Nov. 1982.

\subsection*{SYNOPSIS}

\noindent ARP translates IP addresses into ethernet addresses, and
vice versa (i.e., it also implements RARP).  This implementation of
ARP supports a single interface, but may be multiply instantiated to
support several network interfaces.

\subsection*{REALM}

ARP is in the CONTROL realm.  There are no ARP sessions -- control
operations may be performed on the protocol object only.

\subsection*{CONTROL OPERATIONS}

\begin{description}

\item[{\tt RESOLVE:}]
Maps an IP address into an ethernet address.
\begin{description}
\item[{\rm Input:}] {\tt IPhost }
\item[{\rm Output:}] {\tt ETHhost}
\end{description}

\item[{\tt RRESOLVE:}]
Maps an ethernet address into an IP address.
\begin{description}
\item[{\rm Input:}] {\tt ETHhost}
\item[{\rm Output:}] {\tt IPhost}
\end{description}

\item[{\tt ARP\_INSTALL:}]
Installs an IP address to ETH address binding.
\begin{description}
\item[{\rm Input:}] { ArpBinding == \tt \{ETHhost eth; IPhost ip;\} }
\item[{\rm Output:}] none
\end{description}

\item[{\tt ARP\_GETMYBINDING:}]
Return the IP and ETH address of the local host for the interface.
\begin{description}
\item[{\rm Input:}] none
\item[{\rm Output:}] { ArpBinding == \tt \{ETHhost eth; IPhost ip;\} }
\end{description}


\end{description}

\subsection*{CONFIGURATION}

\noindent {\tt name=arp protocols=eth;}

\subsection*{AUTHORS}

\noindent Larry Peterson and Norm Hutchinson