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Pastimes : Dream Machine ( Build your own PC )
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To: Street Walker who wrote (807)5/24/1998 5:30:00 PM
From: Dirk Hente  Read Replies (2) of 14778
 
When you want to share your internet connection among N computers you usually have the problem that you only get one registered IP address from your provider while you are using N unregistered IP adresses for your LAN.
For example:
you have 2 computers at home. Then you set up a TCP/IP network and assign the IP adresses
192.168.0.10 to computer 1 and
192.168.0.20 to computer 2.
When you connect to your internet provider with computer 1, it will be assigned dynamically an internet address
195.124.9.100 to your gateway (computer 1).
The point is, the last IP adress is a registered one while the first 2 are not. This implies that you cannot receive any data from the 'outside world' because your 192.168.0.* adresses are not known outside of your LAN. Actually, it is not possible at all to route 'non registered' ip adresses.
There are essentially 2 solutions for this:
1.You can get registered IP adresses for your LAN
Problem here, its quite expensive due to the lack of IP adresses. If you look at the ARIN (American registry for Internet Numbers, arin.net) home page the cheapest you can get is a block of 32 Class C adreesses for 2,500$
2. You can use NAT
NAT translates your non registered IP adresses on the fly by the one you got dynamically from your provider while your gateway is transmittig/receiving the data.
NAT is done by programs like wingate or winproxy. Of course
you can buy NAT routers as well. But it is not possible to do this with the router/proxy software in NT4.0.
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