Here is what i would do. If you really really want telnet enabled well thats your thing so ill help ya out. in your /etc/hosts.allow just put the ip and hostname in that file and you should be good. But what i would do is use ssh. SSH allows for i thing 128 bit encryption for every packet.....that way if your network is compromised they will have a much harder time "sniffing"your packets.If you have any other questions or the hosts.allow doesnt work you still have a few other options.