[Gllug] Can't connect to apache locally

Sean Burlington sean at uncertainty.org.uk
Mon Oct 25 18:35:22 UTC 2004


Russell Howe wrote:
> 
> What needs to happen is that at the same time as performing DNAT, the
> firewall performs SNAT to its internal address (let's say it's
> 10.0.3.1). This way, the packet leaves the firewall destined for
> 10.0.3.131, with a source address of 10.0.3.1. The web server replies to
> 10.0.3.1, and the firewall rewrites the source address of the packet to
> be 1.1.1.1 before forwarding to 10.0.3.100.
> 
> Whew. Hope that made sense :)
> 
> The main disadvantage here is that all traffic to the web server has to
> go through the firewall, even if it's from a machine on the same segment
> as the web server. That could place a limit on throughput and also
> increase the load on the firewall, so you may want to make foo.url.com
> resolve to the internal address for hosts within your network. If you
> run a bind nameserver, you can do this using zones in more recent
> versions of bind.
> 

I have a similar issue - I was thinking I would have to change all 
machines on our network to query an internal DNS server ...

..are you saying that I can get bind to return different ip addresses 
for the same name depending on the orgigin of the request ?

this would be very usefull - could you point me at the relavent 
documentation

-- 

Sean
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