Thanks for all the tips, here and in various books and places that monks frequent outside the monestry.

This is what I have to date, a few little issues to sort out

#!/usr/local/bin/perl -w

# modules required
use strict;
use IO::Socket;
use IO::Tee;
use Fcntl;

# get port number and server IP
my $SERVICE = <DATA>;
my $REMOTE = <DATA>;

# connection to remote server (data source)
my $remote = new IO::Socket::INET(
                PeerPort => $SERVICE,
                PeerAddr => $REMOTE,
                Proto => 'tcp',
                Type => SOCK_STREAM,
                ) or die "Can't connect: $!\n";

# local port to accept connections from probes
my $local = new IO::Socket::INET(
                LocalPort => $SERVICE,
                Proto => 'tcp',
                Listen => 3,
                Reuse => 1,
                ) or die "Can't create server : $!\n";

# make local ports non-blocking
fcntl($local,F_SETFL, fcntl($local,F_GETFL,0) | O_NONBLOCK);

# build a hash for client connections
# use a STDOUT so I can see what's happening on server locally.
# can drop for production
my %clients = ("StdOut"=>\*STDOUT,);
my $buf;

# loop forever
while (1) {

        # if a probe connects add details to hash
        my $client = $local->accept();
        $clients{$client} = $client if $client;

        # this bit remove clients that have disconnected
        foreach (keys %clients) {
                delete $clients{$_}
                                if ($_ ne "StdOut" and !$clients{$_}->
+connected());

        }

        # send data to all connected clients
        my $tee = IO::Tee->new(values %clients);
        print $tee $buf if (defined $remote and $buf = <$remote>);

}

__END__
8099
<server ip goes here>
[download]

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