Re: Need help with reverse DNS

dickenson_at_cfmc.com

To: RedHat Mail List <redhat-list@redhat.com>
Date: Mon, 26 Jan 2004 11:15:45 -0800


-- 
Jim Dickenson
> From: "L. Christopher Luther" <CLuther@Xybernaut.com>
> Reply-To: redhat-list@redhat.com
> Date: Mon, 26 Jan 2004 13:54:50 -0500
> To: "'redhat-list@redhat.com'" <redhat-list@redhat.com>
> Subject: RE: Need help with reverse DNS
> 
> A couple of things:
> 
> 1) The forward DNS lookup records (e.g., host, alias, mx) are typlcally
> "owned" by the entity that is authorative over the domain.  In this case,
> the authority for your domain, mollynet.com, is ZoneEdit.com.
> 
> 2) The reverse DNS lookup records (i.e., ptr) are "owned" by the entity that
> is authorative over the IP block in which the host in question resides.  In
> this case, the authority for your IP address, 66.93.153.62, is
> SpeakEasy.net.  
> 
> 3) Reverse DNS records point to specific hosts not domains.  Therefore, of
> your IP host is called "mailman.mollynet.com" then the PTR record would look
> like this:  
> 
>   62.153.93.66.in-addr.arpa.  1H IN PTR mailman.mollynet.com
> 
> And yes, SpeakEasy.net would be the organization you would need to contact
> to arrange a PTR change, but no, you would not need to move the DNS from
> ZoneEdit.com to SpeakEasy.net.  We use ServerVault.com to host our DNS but
> UU.net is our actual ISP and it is they who have setup PTR records for our
> mail servers.  
> 
> 
> HTH,  
> 
> - Christopher
> 
> 
> 
> -----Original Message-----
> From: Frank Reichenbacher [mailto:frank@bio-con.com]
> Sent: Saturday, January 24, 2004 10:26 PM
> To: redhat-list@redhat.com
> Subject: Need help with reverse DNS
> 
> 
> I run a small private email list on qmail/ezmlm-idx off my RH 7.0
> machine on a DSL connection from my home. It's been running well for two
> or three years now and earning its keep. Lately though, I noticed that
> the aol.com address are bouncing. The bounce message indicates that
> aol.com has blacklisted my server because of complaints about
> unsolicited bulk email. Well, strictly speaking this is impossible. I
> examine the logs and messages to postmaster frequntly, and I can see
> that my server is not being used by me or anyone else for mass
> unsolicited emails.
> 
> I called aol.com and got the ball rolling to unblock me and establish a
> feedback loop, but in the meantime, I think I had better establish a
> reverse DNS zone for the server, just in case that had a part in the
> complaints. My problem is that I've got to be very careful about this
> since I cannot afford any down time if I screw it up.
> 
> Before getting into it, though, I must admit that DNS has been a very
> hard subject for me to understand. It's also been quite a while since I
> set all this up and I'm getting a little hazy about the whole process.
> 
> I have DNS handled by ZoneEdit.com:
> Domain: mollynet.com, 66.93.153.62
> My ISP is Speakeasy.net.
> 
> named.conf
> ;
> ; a caching only nameserver config
> ;
> directory                              /var/named
> cache           .                      named.ca
> primary         0.0.127.in-addr.arpa   named.local
> 
> dig-x 66.93.153.62
> ; <<>> DiG 8.3 <<>> -x
> ;; res options: init recurs defnam dnsrch
> ;; got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
> ;; QUERY SECTION:
> ;;    1.1.168.192.in-addr.arpa, type = ANY, class = IN
> 
> ;; ANSWER SECTION:
> 62.153.93.66.in-addr.arpa.  1H IN PTR
> dsl093-153-062.phx1.dsl.speakeasy.net
> 
> nslookup -type=SOA mollynet.com
> 
> Server:  dsl231-041-022.sea1.dsl.speakeasy.net
> Address:  216.231.41.22
> 
> Non-authoritative answer:
> mollynet.com
> origin = ns3.zoneedit.com
> mail addr = dnsadmin.zoneedit.com
> serial = 980910580
> refresh = 14400 (4H)
> retry   = 7200 (2H)
> expire  = 864000 (1w3d)
> minimum ttl = 7200 (2H)
> 
> Okay now, this pointer record is my problem, right?
> 62.153.93.66.in-addr.arpa.  1H IN PTR
> dsl093-153-062.phx1.dsl.speakeasy.net
> 
> If I tell Speakeasy.net to change that to:
> 62.153.93.66.in-addr.arpa.  1H IN PTR mollynet.com
> 
> it will solve my problem. Right? Isn't that what is meant by reverse
> DNS? 
> 
> If I do this, can I still have ZoneEdit.com handle DNS for me? Or do I
> then need to switch DNS to Speakeasy.net? This is important to me,
> because ZoneEdit is free, while Speakeasy.net is not.
> 
> Here's another part of the problem.
> 
> nslookup -type=SOA 66.93.153.62
> 
> *** No start of authority (SOA) records available for 66.93.153.62
> 
> Where does the SOA for my IP address come from? I do not understand how
> there isn't SOA.
> 
> Any suggestions will be appreciated.
> 
> Frank
> 
> 
> 
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Re: Need help with reverse DNS

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