DESCRIPTION

       The  following  environment  variables describe a TCP connection.  They
       are set up  by  tcpclient  and  tcpserver  as  well  as	sslclient  and
       sslserver.

       Note  that  TCPLOCALHOST, TCP6LOCALHOST,	TCPREMOTEHOST, TCP6REMOTEHOST,
       and TCPREMOTEINFO, TCP6REMOTEINFO, can contain arbitrary	characters.

       PROTO
	    The	string TCP, or TCP6.

       TCPLOCALHOST/TCP6LOCALHOST
	    The	domain name of the local host,	with  uppercase	 letters  con-
	    verted  to	lowercase.   If	there is no currently available	domain
	    name for the local IP address, TCPLOCALHOST, TCP6LOCALHOST is  not
	    set.

       TCPLOCALIP
	    The	IPv4 address of	the local host,	in dotted-decimal form.

       TCP6LOCALIP
	    The	compactified IPv6 address of the local host.

       TCPLOCALPORT/TCP6LOCALPORT
	    The	local TCP port number, in decimal.

       TCPREMOTEHOST/TCP6RMOTEHOST
	    The	 domain	 name  of the remote host, with	uppercase letters con-
	    verted to lowercase.  If there is no  currently  available	domain
	    name for the remote	IP address, TCPREMOTEHOST or TCP6REMOTEHOST is
	    not	set.

       TCPREMOTEINFO/TCP6REMOTEINFO
	    A connection-specific string, perhaps a username, supplied by  the
	    remote  host  via  931/1413/IDENT/TAP.  If the remote host did not
	    supply connection information,  TCPREMOTEINFO,  TCP6REMOTEINFO  is
	    not	set.

       TCPREMOTEIP
	    The	IPv4 address of	the remote host.

       TCP6REMOTEIP
	    The	IPv6 address of	the remote host.

       TCPREMOTEPORT/TCP6REMOTEPORT
	    The	remote TCP port	number.

       TCP6INTERFACE
	    contains the interface name	for IPv6 connections.

SEE ALSO

       sslclient(1), sslserver(1), tcpclient(1), tcpserver(1), 
       tcp(4)