Asendorf, John wrote:
I'm attempting to help out network adminstrator figure out how, or if, we can
rout traffic coming to a single public IP to two different servers inside our
network by subdomain. For instance, we want www.site.com and www2.site.com to
have the same A record which send requests to the same public IP address yet,
once they come to the firewall they are parsed to two different internal
servers, 10.80.10.3 and 10.80.10.6 (for instance).
Please don't write your paragraphs on one line.
A few problems here.
First off, there is no 100% sure way to do this. In HTTP 1.0, a host
could send,
GET / HTTP/1.0
To the external, public IP address. To which host do you send this?
There is absolutely no way to know which virtual site the user might
be interested in. That's perfectly valid HTTP. The "Host:" header is
not required in HTTP 1.0.
Now most of the time you will get a "Host:" line for HTTP 1.0 and it
is required for 1.1, which makes up the vast majority of HTTP traffic.
However, you still need an application layer proxy to do this. Consider
when the firewall gets a SYN to the public IP address in question.
It cannot forward the SYN until it gets the "Host:" header. It has to
complete the TCP connection itself.
AFAIK, your basic FW-1 does NOT do this kind of proxying. If anyone here
does know how to get FW-1 to do any kind of proxying, I'd love to hear
about it 'cause I have some other ways I would like to use it (blocking
and allowing HTTP clients to certain URLs).
--
Crist J. Clark crist.clark AT globalstar DOT com
Globalstar Communications (408) 933-4387
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