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From "Boyle Owen" <>
Subject RE: [users@httpd] apache, virtual domains, and firewalls
Date Thu, 06 Oct 2005 06:28:14 GMT
> -----Original Message-----
> From: Kevin Rattai []
> Sent: Donnerstag, 6. Oktober 2005 00:36
> To:
> Subject: [users@httpd] apache, virtual domains, and firewalls
> I'm sure this is slightly OT, but hope someone can give me insight on 
> this.
> I'm running Apache inside a firewall and the environment variables 
> aren't being passed through, so all requests for name based virtual 
> domains end up at the default domain.

Environment variables are specific to a particular machine and are typically set by one program
and read by another. They are not "passed through" - ie, sent from one machine to another...
Name-based virtual hosting works by matching the contents of the "Host" header in the request
with the arguments to the ServerName and ServerAlias directives. Assuming that the packet
containing the request makes it through the FW, there is no reason why the Host header should
be lost.

I suspect the problem is more to do with your network configuration. For example;

- how many IP addresses does apache listen to?
- does it listen to the external (real) IP?
- does it listen to an internal IP (eg 192.168...)
- does the FW translate the external IP to an internal one?
- are your NBVHs setup on the internal or external IP?

Think carefully about the route a packet takes from the outside world into the server and
how it is routed as it goes through the FW (ie, how does its destination IP change).

Owen Boyle
Disclaimer: Any disclaimer attached to this message may be ignored. 

> Can someone point me to or provide info on how I should set up my 
> (smoothwall and linksys router) firewall to pass the environment 
> variables through?
> Thanks,
> Kevin
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