 | | | Need help with reverse DNS | Need help with reverse DNS 2004-01-24 - By Frank Reichenbacher
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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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