[LHA-misc] Linux Behind a Router

[Lloyd F. <llo...@us...>]

This is probably not the correct forum to be asking a networking/security 
question but perhaps someone has been through it and can give me some 
pointers.  When I get it working I fully intend to use it to remotely 
control some X-10 stuff connected to my Linux box:)

I have recently had a cable modem installed and purchased a SMC Barricade 
Router and signed up for dynamic DNS at d2g.com.  I would like to access my 
RedHat Linux box for Web, Telnet, etc. from the outside world.  Starting 
with Telnet, I think I have got the firewall configured correctly to pass 
port 23 through to my Linux box but when I try to log on, I get "Connect 
 From Unknown" and "Can't get Client Address" when I look at 
var/log/secure.  I have had similar problems telnetting in from machines on 
my local network and have found that I must add their IP address to 
/etc/hosts.  I've tried adding the address of my firewall and the current 
external IP address to /etc/hosts as well as the entire subnet of the 
external IP address to /etc/hosts.allow with no success.  I have similar 
problems and log entries in my Apache web server logs.  Does anybody know 
how to allow a limited dynamic IP address to get access to the server?