[NAT] NAT question
Matt Alexander <m@netpro.to> Thu, 23 August 2001 00:14 UTC
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Date: Wed, 22 Aug 2001 17:15:23 -0700
From: Matt Alexander <m@netpro.to>
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Subject: [NAT] NAT question
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I have a question about NAT (IP Masq) that I've wondered about...
Let's say you have a setup like this:
Internet
--------
|
|
|
|-----|
| NAT |
|-----|
|
|
|-----| |------|
| HUB |-------| Web |
|-----| |Server|
| |------|
|
|--------|
| client |
|--------|
The NAT box is also port-forwarding any requests on the external interface
for port 80 to the Web server. The web server and the client boxes have
private IP addresses. Users connecting from the Internet are able to
access the Web server without any problems, but if a user sitting on the
internal network on the client box tries to access the web server, it
will do a lookup and get the external IP address of the NAT box, and the
connection to the web server will fail. In the past I've dealt with this
situation by either putting the web server's private IP address in all the
client's hosts files, or I've setup a DNS server on the internal network.
So my question is, why does NAT fail in this situation? Why doesn't the
client's request get redirected back to the web server? I'm fairly
comfortable with TCP/IP so feel free to get as detailed as possible.
Thanks,
~M
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- [NAT] NAT question Matt Alexander
- RE: [NAT] NAT question Tim Dorcey