============================================================================README DOCUMENT FOR RVNAMED----------------------------------------------------------------------------DESCRIPTION-----------rvnamed is a supplementary program distributed with IPTraf 1.1 and later.  This is a reverse name resolution daemon used by IPTraf to resolve IP addresses to host names in the background, keeping IPTraf from waiting until the lookup is completed.Starting with version 1.1.0, if Reverse Lookup is enabled in the Options menu, the IP Traffic Monitor will attempt to start rvnamed.  If for some reason rvnamed is already running, IPTraf will use it immediately.  Otherwise, it will attempt to start rvnamed.  As of IPTraf 1.2.0, thervnamed is placed together with the main IPTraf executable in /usr/local/bin.When the traffic monitor is done, IPTraf tells rvnamed to quit.PROTOCOL--------rvnamed and IPTraf communicate with each other with the BSD UNIX domain socket IPC facility.  They use datagram sockets.rvnamed recognizes only 4 types of messages:RVN_HELLO	the Hello packet.  This simply causes rvnamed to throw it		back to IPTraf, telling it rvnamed is active.RVN_REQUEST	a reverse lookup request.  This message includes an IP address		to resolve.  When rvnamed receives this request, it 		checks its internal cache to see if this IP address is 		already resolved or being resolved.  If it isn't in the cache		yet, rvnamed forks off a copy which resolves in the background,		while it returns the IP address in the meantime.  Subsequent		requests will get the IP address until such time that the		child has completed the resolution, at which time, a request		will get the host name in reply.RVN_REPLY	rvnamed marks reply packets with this tag.  Reply packets		contain the resolved host name or the ASCII representation		of the IP address, and an indicator of the state of the		resolution for this address (NOTRESOLVED, RESOLVING, or		RESOLVED).RVN_QUIT	Tells rvnamed to terminate.The datagram structure and #define's are found in the rvnamed.h header file.Important rvnamed messages are written to /var/log/iptraf/rvnamed.log.IPTraf 2.5.0 and 2.6.0 refined rvnamed's operation by including timeoutsfor child processes (5 minutes) and better management of the internalIP address/FQDN cache.  See the CHANGES file.To reduce overhead, IPTraf will query rvnamed only once per invocation of the IP traffic monitor.rvnamed should work properly with a correct installation.  Report anyproblems to me at riker@seul.org.