Reverse DNS not working for Domain name


J

jdube

My problem started last week with emails bouncing back as
undelverable do to reverse lookup from one recipients
mail server. I ran nslookup from several servers internal
and external and at least on the external servers my
domain is coming up with Non-existant domain. I run all
of my own DNS and nothing had changed up until my fooling
around with it adding a new external dns machine.
Everything looks correct. We are running win 2000 and
exchange 2000. Mail is flowing and our websites have no
problem. Any thoughts???


Jay
 
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W

William Stacey

don't use nslookup. Use dig or netdig (www.mvptools.com). You can see more
what is going on. Do the queries from the outside and post the results or
post the domain name so we can test from out here... Cheers!
 
J

John Coutts

My problem started last week with emails bouncing back as
undelverable do to reverse lookup from one recipients
mail server. I ran nslookup from several servers internal
and external and at least on the external servers my
domain is coming up with Non-existant domain. I run all
of my own DNS and nothing had changed up until my fooling
around with it adding a new external dns machine.
Everything looks correct. We are running win 2000 and
exchange 2000. Mail is flowing and our websites have no
problem. Any thoughts???

Jay
********************* REPLY SEPARATER ***********************
Your own server is dishing out the answers, although the multple answers really
server no practical purpose since most client programs do not look past the
first one.
--------------------------------------------------------------
server 137.165.18.102
Default Server: [137.165.18.102]
Address: 137.165.18.102
clarkart.edu
Server: [137.165.18.102]
Address: 137.165.18.102

clarkart.edu nameserver = little.clarkart.edu
clarkart.edu nameserver = rosinante.clark.williams.edu
clarkart.edu nameserver = kenebec.clarkart.edu
clarkart.edu
primary name server = little.clarkart.edu
responsible mail addr = caiadmin.clarkart.edu
serial = 2000083084
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
clarkart.edu MX preference = 10, mail exchanger = hudson.clarkart.edu
little.clarkart.edu internet address = 137.165.18.102
rosinante.clark.williams.edu internet address = 137.165.18.30
kenebec.clarkart.edu internet address = 137.165.18.99
hudson.clarkart.edu internet address = 137.165.18.102
102.18.165.137.in-addr.arpa
Server: [137.165.18.102]
Address: 137.165.18.102

102.18.165.137.in-addr.arpa name = gauley.clarkart.edu
102.18.165.137.in-addr.arpa name = little.clarkart.edu
102.18.165.137.in-addr.arpa name = hudson.clarkart.edu
102.18.165.137.in-addr.arpa name = media.clarkart.edu
102.18.165.137.in-addr.arpa name = ns1.clarkart.edu
--------------------------------------------------------------
From the outside world however, the authority for that domain resides with
Williams College Campus, and they do not supply a reverse lookup. They must
delegate to you in order for your DNS to provide reverse lookup. Otherwise,
what you do internally on your own network has no value to the outside world.
--------------------------------------------------------------
102.18.165.137.in-addr.arpa
Server: server1.yellowhead.com
Address: 207.34.104.4

*** server1.yellowhead.com can't find 102.18.165.137.in-addr.arpa: Non-existent
domain
18.165.137.in-addr.arpa
Server: server1.yellowhead.com
Address: 207.34.104.4

Non-authoritative answer:
18.165.137.in-addr.arpa
primary name server = rosinante.clark.williams.edu
responsible mail addr = postmaster.clark.williams.edu
serial = 2000022901
refresh = 10800 (3 hours)
retry = 3600 (1 hour)
expire = 604800 (7 days)
default TTL = 86400 (1 day)J.A. Coutts
 
J

jdube

Thanks for the answer. This is what I was looking for. I
originally contacted williams about this and they felt
the problem was internal to my configuration. I am
passing on your info to them. Thanks for the Help!!!


Jay
-----Original Message-----
My problem started last week with emails bouncing back as
undelverable do to reverse lookup from one recipients
mail server. I ran nslookup from several servers internal
and external and at least on the external servers my
domain is coming up with Non-existant domain. I run all
of my own DNS and nothing had changed up until my fooling
around with it adding a new external dns machine.
Everything looks correct. We are running win 2000 and
exchange 2000. Mail is flowing and our websites have no
problem. Any thoughts???

Jay
********************* REPLY SEPARATER ***********************
Your own server is dishing out the answers, although the multple answers really
server no practical purpose since most client programs do not look past the
first one.
--------------------------------------------------------- -----
server 137.165.18.102
Default Server: [137.165.18.102]
Address: 137.165.18.102
clarkart.edu
Server: [137.165.18.102]
Address: 137.165.18.102

clarkart.edu nameserver = little.clarkart.edu
clarkart.edu nameserver = rosinante.clark.williams.edu
clarkart.edu nameserver = kenebec.clarkart.edu
clarkart.edu
primary name server = little.clarkart.edu
responsible mail addr = caiadmin.clarkart.edu
serial = 2000083084
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
clarkart.edu MX preference = 10, mail exchanger = hudson.clarkart.edu
little.clarkart.edu internet address = 137.165.18.102
rosinante.clark.williams.edu internet address = 137.165.18.30
kenebec.clarkart.edu internet address = 137.165.18.99
hudson.clarkart.edu internet address = 137.165.18.102
102.18.165.137.in-addr.arpa
Server: [137.165.18.102]
Address: 137.165.18.102

102.18.165.137.in-addr.arpa name = gauley.clarkart.edu
102.18.165.137.in-addr.arpa name = little.clarkart.edu
102.18.165.137.in-addr.arpa name = hudson.clarkart.edu
102.18.165.137.in-addr.arpa name = media.clarkart.edu
102.18.165.137.in-addr.arpa name = ns1.clarkart.edu
--------------------------------------------------------
------
From the outside world however, the authority for that domain resides with
Williams College Campus, and they do not supply a reverse lookup. They must
delegate to you in order for your DNS to provide reverse lookup. Otherwise,
what you do internally on your own network has no value to the outside world.
--------------------------------------------------------- -----
102.18.165.137.in-addr.arpa
Server: server1.yellowhead.com
Address: 207.34.104.4

*** server1.yellowhead.com can't find 102.18.165.137.in- addr.arpa: Non-existent
domain
18.165.137.in-addr.arpa
Server: server1.yellowhead.com
Address: 207.34.104.4

Non-authoritative answer:
18.165.137.in-addr.arpa
primary name server = rosinante.clark.williams.edu
responsible mail addr = postmaster.clark.williams.edu
serial = 2000022901
refresh = 10800 (3 hours)
retry = 3600 (1 hour)
expire = 604800 (7 days)
default TTL = 86400 (1 day)J.A. Coutts

.
 
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J

John Coutts

Thanks for the answer. This is what I was looking for. I
originally contacted williams about this and they felt
the problem was internal to my configuration. I am
passing on your info to them. Thanks for the Help!!!


Jay
***************** REPLY SEPARATER *******************
One further note. Most ISP's do not want to delegate authority for a small
number of IP addresses, because it is a more complex process for anything less
than a "C" class domain. Mail servers should not verify the domain name of the
reverse lookup against the the domain name on the incoming mail. That is
because these days, many domains share the same IP address, and many programs
do not look past the first answer. They should only verify that it does provide
a reverse lookup, and even that is of questionable value.

Therefore, for a few IP addresses, it is better to let the ISP provide the
reverse lookup.

J.A. Coutts
 
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