Is there a way to disable dnslookup only for a particular network? For example, for 127.0.0 and 192.168.1?
On Thu, 2008-11-27 at 21:57 -0500, Sam Varshavchik wrote: > 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. > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ courier-users mailing list > [email protected] Unsubscribe: > https://lists.sourceforge.net/lists/listinfo/courier-users ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
