Hi,

How can you tell if you have reverse dns enabled on a server running linux 7.3? If it isn't enabled. How does one go about enabling it?

One more questions. If reverse dns is enabled, will it do reverse lookups for all the nameservers on the server? Because some guy with south african domains wants hosting on my server, but they require reverse dns.

Thanks.

you have to make a reverse dns zone file (in-addr.arpa)

It will work for the nameservers on the server I believe

umm. sorry. im a dunce i guess. ntwaddel could you expand on that? What needs to be in the file, and where to put it?

this is a quick howto on foward and reverse dns

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/dns.html

Check out http://www.dnsreport.com/

They will let you know whether you have RDNS setup or not and some more info that might be good and some other that is crappy

Another site they have is www.dnsstuff.com

I HIGHLY suggest O'Reillys DNS & Bind Book. It's about $30 but you'll become a DNS master. Do a google search for reverse dns and you'll come up with alot of stuff.

If you still need help e-mail me.

yeah the O'Reilly book is very good :D

Reverse DNS isn't something you "enable" on a server. Reverse DNS works just like "regular" DNS but using the in-addr.arpa domain and PTR records. If you don't have any clue what I'm talking about, then chances are that your provider hasn't delegated reverse DNS authority to your server anyway, so there's nothing you can do on your server to "enable" it. You will have to contact your provider regarding reverse DNS, and tell them what host name you want each IP address to resolve to.

You should goto arin.net and do a whois on your IP address, more than likely you are not authoritative to do reverse DNS and your upstream provider will have to do it for you or delegate it down to you.