Ricardo Kleemann writes:
On Thu, 2008-11-27 at 16:20 -0500, Sam Varshavchik wrote:Ricardo Kleemann writes:> Thanks Sam.> > But if I'm connecting to localhost, how does that play into reverse DNS?It doesn't matter what your IP address is. Courier still attempts to resolve it. The only thing that's special about localhost is that it's IP address is 127.0.0.1> The server is behind a firewall so the actual connecting address would > be an internal IP anyway. But in the case of localhost I don't > understand the role of reverse DNS and ident lookup.Courier performs reverse/forward DNS lookup on the connecting IP address. Whether it's localhost, or some other IP address, it doesn't make a difference.Ok, I see. So how typically does localhost resolve in reverse DNS? I am using a dnscache in my firewall, I'm not sure how to make that work with reverse DNS, anyone know?
If you run your own nameserver, you set it up as authoritative for 0.0.127.in-addr.arpa, and provide a mapping for 127.0.0.1. ISPs typically set up their DNS servers the same way, so if you're using your ISP's name servers, this should work as well. If you have one that's not up to speed, you pretty much have to run your own name servers, to bypass the damage.
Once 127.0.0.1 gets resolved to "localhost", that has then has to be resolved forwards. /etc/resolv.conf gives your domain, example.com, so a query goes out to localhost.example.com. You'll set up your domain so that localhost.example.com maps back to 127.0.0.1, and you're done.
First, you should check what a query for 127.0.0.1 resolves for you: dig -x 127.0.0.1. If your setup resolves it properly to localhost, you'll just need to provide a suitable entry for localhost in your domain.
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