cashpoint Posted September 15, 2005 Share Posted September 15, 2005 I'm trying to setup the reverse DNS for in a zone file so AOL accepts mail from our mail server as it appears to be bouncing some of it and the reverse DNS may be one reason. I've got: 102.239.205.194 86400 PTR mail.ambrit.co.uk. at present mail.ambrit.co.uk has an A record of 194.205.239.102 so is this right as i can't tell if it's working or not. Or do I need to enter it somewhere else. The mail server also needs to send mail from other domain names so does it need PTR record adding to outhe domains. F**KING AOL Link to comment Share on other sites More sharing options...
Pete Posted September 15, 2005 Share Posted September 15, 2005 Don't AOL require SPF too? Why are there two different IP addresses? Surely they should be the same? Link to comment Share on other sites More sharing options...
cashpoint Posted September 15, 2005 Author Share Posted September 15, 2005 got that already it the PTR thats confusing the hell out of me Link to comment Share on other sites More sharing options...
samsupra37 Posted September 15, 2005 Share Posted September 15, 2005 pmd Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2005 Share Posted September 15, 2005 shouldn't it be 102.239.205.194.in-addr.arpa ? Been a while since I've done DNS zones by hand. Link to comment Share on other sites More sharing options...
cashpoint Posted September 15, 2005 Author Share Posted September 15, 2005 the reverse means there backward or at least that's what i've been able to gleem from the net but I haven't been able to find and real world examples. Link to comment Share on other sites More sharing options...
cashpoint Posted September 15, 2005 Author Share Posted September 15, 2005 shouldn't it be 102.239.205.194.in-addr.arpa ? Been a while since I've done DNS zones by hand. saw the in-addr.arpa in examples what is it ? Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2005 Share Posted September 15, 2005 I just did a lookup and the DNS for that is working fine. Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2005 Share Posted September 15, 2005 saw the in-addr.arpa in examples what is it ? in-addr.arpa is the domain used for numeric PTRs.. or something Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2005 Share Posted September 15, 2005 AOL maintains a database of 'end user' IPs, and they blacklist these so you will still be stuck. You should email [email protected] (i think) to be added to their whitelist, or configure your smtp server to forward onto your ISPs relay. Link to comment Share on other sites More sharing options...
carl0s Posted September 15, 2005 Share Posted September 15, 2005 The mail server also needs to send mail from other domain names so does it need PTR record adding to outhe domains. no the PTR is just for that IP... Link to comment Share on other sites More sharing options...
Branners Posted September 15, 2005 Share Posted September 15, 2005 took this direct from http://www.dnsstuff.com Reverse DNS for 194.205.239.102 Generated by http://www.DNSstuff.com Location: EU Preparation: The reverse DNS entry for an IP is found by reversing the IP, adding it to "in-addr.arpa", and looking up the PTR record. So, the reverse DNS entry for 194.205.239.102 is found by looking up the PTR record for 102.239.205.194.in-addr.arpa. All DNS requests start by asking the root servers, and they let us know what to do next. See How Reverse DNS Lookups Work for more information. How I am searching: Asking b.root-servers.net for 102.239.205.194.in-addr.arpa PTR record: b.root-servers.net says to go to ns3.nic.fr. (zone: 194.in-addr.arpa.) Asking ns3.nic.fr. for 102.239.205.194.in-addr.arpa PTR record: ns3.nic.fr [192.134.0.49] says to go to ns.ripe.net. (zone: 205.194.in-addr.arpa.) Asking ns.ripe.net. for 102.239.205.194.in-addr.arpa PTR record: Reports mail.ambrit.co.uk. [from 193.0.0.193] Answer: 194.205.239.102 PTR record: mail.ambrit.co.uk. [TTL 7200s] [A=194.205.239.102] To see the reverse DNS traversal, to make sure that all DNS servers are reporting the correct results, you can Click Here. hope that makes sense, cos it doesnt to me and we recently turned reverse DNS lookup on at work. Lots of people dont have it set right. You wait until you get the next level of reverse DNS where your outgoing email address IP must point to the same IP as your outgoing domain name IP, thats a corker to set up. JB Link to comment Share on other sites More sharing options...
Pete Posted September 15, 2005 Share Posted September 15, 2005 shouldn't it be 102.239.205.194.in-addr.arpa ? Been a while since I've done DNS zones by hand. Oh bloody hell of course it's backwards! Duh... Ok, here's an example off one of my servers.. ; ; REVERSE DNS ZONE FILE $TTL 8h $ORIGIN 155.188.195.in-addr.arpa. @ IN SOA ns.rocketuk.net. hostmaster.rocketuk.net. ( 2005030905 ; Serial 12h ; Refresh (when slave will try to xfer from master) 15m ; Retry (when slave will retry update on failed master) 2w ; Expire (how long the slave remains authoratative with 3h ; Minimum (time a name error is cached) ) IN NS ns.rocketuk.net. IN NS ns2.rocketuk.net. IN NS ns2.cableinet.co.uk. IN NS ns3.cableinet.co.uk. 2 IN PTR firewall.rocketuk.net. 70 IN PTR cctv.midlandcomputers.co.uk. 10 IN PTR isa.midlandcomputers.co.uk. etc.... Link to comment Share on other sites More sharing options...
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