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On 21 Oct 97 somewhere around 11:17, Hisham Abdullatif Al-Rumaihi (Hisham Abdullatif Al-Rumaihi <rumaihi @
bh>) wrote sbout "IP addresses":
> We have Class C network, and we have 400 internet users, 150 of them not
> using the internet, but they are using TCP/IP applications(Oracle).
> We have DHCP server running on NT 4.0, and Proxy server running on NT
> 4.0 for accessing the internet through ip addresses.
> The problem is we are running out of IP addresses, and not all the users
> using the internet, is there a way to give the oracle users illegal ip
> Please can anybody help us.
There are at least two possible solutions for that
1-If the oracle people NEVER use the internet, The 192.168.x.y class
C ranges are availible for use in private networks that do not
connect to the internet. The only requirement to use these is that
they must not be broadcast past your border routers. [most modern
routers already block sending and recieving addresses from the
"private" block of IP addresses]. You just need to multihome the
oracle server so that both real and private addresses can acccess it.
2- The second solution is to use a NAT [network
address transelation] firewall/router. These allow you to dynamically
transelate between a private number to a real number.
Some many:one where many addresses will be transelated to one
"outgoing" machine. Some routers can do this. There are also at
least 2 software solutions. Nevod has an NT based solution as their
NAT1000 software[commercial], and Linux has the IP masquerading
options [free]. With this method (NAT1000 or IPMASQ) you can use the
"real" ips for machines that HAVE to be seen diretcly from the
internet, and the "private" for those that browse.
There are also some [many:many] NAT devices out there, that will
transelate from one of the private IPs to an IP out of a "pool" of
availible external addresses. This solution is usually more expensive
than the others mentioned.
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From: "Hisham Abdullatif Al-Rumaihi" <rumaihi @