[9fans] OT: reverse dns queries


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[9fans] OT: reverse dns queries

Postby steve.simon » Wed, 09 Jun 2004 01:24:15 GMT


Off topic but...

Our DNS tables (inside the firewall) don't have their PTR
records for all hosts, however nslookup on a Unix box is
able to list (nslookup's ls command) these hosts and their
IP addresses; how is it able to do this?


Similar Threads:

1.OT: set up Reverse DNS zone

2.O.T. Reverse DNS

3.Forwarding reverse DNS queries

A customer of mine is having issues with their reverse DNS. The 
situation is this:

They lease a block of IPs from me. The customer has his own DNS servers 
(two of them). Forward lookups work fine, but reverse lookups don't work.

I understand what the problem is--reverse lookups are being directed to 
my servers since I own the IP block in question.

The question is: How do I forward reverse DNS lookups for a specific 
block of IPs to his servers?

4.Reverse Lookup queries outside of windows DNS

I currently have all of our windows environment on AD DNS. However I have 
devices that are not in windows or joined to AD and are registered in an 
another DNS structure in the company.   I have forwarding setup to forward 
lookups to the other DNS structure if the record is not hosted in AD DNS. 
Those are working fine. It does not seem to forward the reverse queries. My 
question is what are my options to getting the reverse lookups to work for 
these devices that are not registered in AD DNS.

Thanks for any help!

5.Reverse DNS query


Have an issue with DNS I think.

I have a user that is getting the following NDR for Exchange 2003:

You do not have permission to send to this recipient.  For assistance, 
contact your system administrator.
            <domain.co.uk #5.7.1 smtp;501 5.7.1 <users email>... Sender IP 
must resolve>

this has only just started to happen and seems to affect a few domains here 
and there - most mail is going through

I  have been looking around the net and have run the DNS report which has 

Reverse DNS entries for MX records - ERROR: The IP of one or more of your 
mail server(s) have no reverse DNS (PTR) entries/* (if you see "Timeout" 
below, it may mean that your DNS servers did not respond fast enough)*/. 
RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It 
is strongly urged that you have them, as many mailservers will not accept 
mail from mailservers with no reverse DNS entry. You can double-check using 
the 'Reverse DNS Lookup' tool on our site if you recently changed your 
reverse DNS entry (it contacts your servers in real time; the reverse DNS 
lookups in the DNS report use our local caching DNS server). The problem MX 
records are:
our IP.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0) (check it)]

The fixed IP is from our ISP but our mail is hosted by another ISP. Where do 
I go to ensure that the reverse DNS entry is correct - I am right in 
thinking that it is the mail host that needs to correct this?

thanks in advance

6. Somewhat OT: Getting control of reverse for my Qwest.net /29

7. OT: Windows and reverse lookup and DHCP

8. Somewhat OT: Getting control of reverse for my Qwest.net /29

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