Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet. Computer networks use the Domain Name System to determine the IP address associated with a domain name. This ...
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29 views
broadcast.addr. in rDNS?
Our in-addr.arpa zones contain entries like the following.
0.2.0.192.in-addr.arpa. 120 IN PTR broadcast.old.
255.2.0.192.in-addr.arpa. 120 IN PTR broadcast.addr.
We don't (nor do any of our ...
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1answer
79 views
My ISP set up a PTR record for my mail server, but some places aren't seeing it
I have a VPS running Windows 2008 server with plesk 9, which I am using for email. I asked to my ISP to add a PTR record, which they did but my mails still droping into spam box.
I have checked ...
2
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3answers
122 views
DNS naming convention for multi-homed devices
Is it bad practice to have multiple IPs resolve via reverse DNS to the same hostname?
Consider a router with multiple interfaces: 1 WAN and 3 separate LANs. Is it appropriate for all four IPs resolve ...
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3answers
173 views
Hotmail wants me to modify my SPF record
This is my current SPF record. It works well with gmail and yahoo but hotmail was ignoring. So i used their submit system and now they replied me with the text below.
This is my current spf
v=spf1 a ...
1
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1answer
76 views
How to prevent multi-homed clients from overwriting their own DNS entries
Most of the computers on our network are laptops, so they have two adapters: wired and wireless. When a laptop is connected to both wired and wireless networks, it registers both IP addresses in DNS. ...
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1answer
28 views
win server 2003: reverse lookup not working for mailserver
hi i'm running a win 2003 server and i need to set up a dns reverse lookup pointer for my mailserver as i'm getting rejected by a certain provider.
i created a new reverse lookup zone in the dns ...
0
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1answer
87 views
want to Request our ISp to do rdns/ ptr modify for my Staic IP ot point to my Domain?
we setup a mail server in our local office using Mdaemon Mail Server . We have a Staic ip 123.xxx.123.xxx ( as an example ) and all necessary ports (80 , 25 , 110 ) are made open .
We have a ...
2
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1answer
109 views
Odd entries in DNS lookup log
With BIND (named) enabled on an OS-X Lion iMac, I can get a list of queries as they occur. In the list are some very strange entries, listed below. Can anyone shed some light on these? (Note that the ...
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2answers
263 views
hotmail blacklist and rDNS questions
My company has recently purchased a VPS for email and webhosting. I am not an expert on email authentication but here is my story.
After the VPS was purchased we started receiving bouncebacks with ...
1
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5answers
229 views
Reverse DNS and mail delivery (550 4.4.7)
I'm trying to fix a problem with mailing in a VPS.
This VPS has only one public IP address and 5 domains hosted. The DNS (Bind) have the 5 different zones configured, every zone has an mx entry to ...
1
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1answer
32 views
Rsync and RDNS won't backup?
Hi I've got a problem trying to Rsync a backup to another server.
I get the error
Address xxxxxxx maps to xxxxxxx, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!
The first ...
2
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3answers
228 views
How to configure bind9 to be a local DNS only with no internet access?
I want to configure bind9 to be a local DNS only with no internet access at all. So I have 5 PCs in my virtual domain xy.com. Within this domain there is no access to the internet.
The DNS server ...
1
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2answers
151 views
Network outage - Mapping, Checking network, BGP, Traceroute, RIPE
At first, I'm not able to name my question properly, so this will be adjusted
I recently experienced an international network gap. Mean when some part of world wide network is unavailable.
I'm ...
0
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4answers
122 views
Delegating a subnet of a /17 in DNS
guys. I have a problem I've run into with our DNS setup at my company. (I'm running BIND9 on a Linux platform, but this is not BIND-specific.)
I need to delegate a /24 reverse zone to another set of ...
0
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2answers
77 views
Reverse DNS for mail server
I have a question about setting a reverse DNS record for my mail server.
Which is the best way to configure:
1.) The IP address reverses to the domain that is sending the email (ie. ...
1
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2answers
160 views
Why Is There A Delay In The SendMail SMTP Banner Greeting When Primary DNS Server Is Unavailable?
CentOS 5.x / SendMail
Hi All,
Normally when I connect to my SendMail server, I see the SMTP banner greeting almost instantly.
I've noticed though, that when the primary DNS server is unavailable ...
0
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2answers
90 views
Reverse DNS with Private NS :: ns1.example.com & website example.com must be on same public IP?
Fairly noobish question, kind of ashamed to be asking ;-)
At any rate, I'm using a commercial control panel (similar to Plesk) that I use to manage DNS. I have ns1.example.com setup with the ...
2
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2answers
86 views
Postfix & client IP reverse DNS
I explicitly added reject_unknown_client_hostname and several other reject rules to slow down SPAM in our server. So far that's working nicely.
However, there is an important client that keeps ...
1
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3answers
115 views
Reverse DNS when sending mail from multiple IP/subdomains
I have site example.com and I want to set an external mail server m1.example.com , most whitelists like AOL requires reverse DNS for all IPs, but in order to fetch the bounces properly I will be ...
0
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1answer
88 views
How to access expired domain website hosted on dedicated server without doing any configuration
I am not sure, this might be a stupid question.
but I would like to know if that is possible. and any website available from where I can do this online.
One of my website is hosted on server i.e. ...
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1answer
137 views
Setting up reverse DNS for a /25 block of IPs
I've currently got a block of IPs that go from xxx.xxx.xxx.128/25
Here's my current rDNS setup:
$TTL 12h
$ORIGIN 128/25.xxx.xxx.xxx.IN-ADDR.ARPA.
@ IN SOA ns1.domain.com. ...
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1answer
65 views
Windows 95/XP/7 Nameserver File Location [closed]
Where is the Windows version of the Linux file resolv.conf?
I'm currently trying to do a reverse DNS lookup on all ips in the local subnet. My code takes in resolv.conf on Linux to do the reverse ...
1
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1answer
55 views
rDNS multiple IPs same interface
I have three different IPs on the same interface:
eth0 192.168.1.103
eth0:0 192.168.1.104
eth0:1 192.168.1.105
and I have the following in /etc/hosts:
192.168.1.103 host.example.com ...
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2answers
121 views
Possible to use double DNS?
Before I used my plesk DNS and found that there is no SPF records in plesk and now I left plesk and started using Godaddy DNS and here I found that there is no PTR records in Godaddy DNS. But I need ...
1
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1answer
56 views
Reverse DNS Lookup Zones
I have two domain controllers that act as a Primary and Secondary DNS servers. Server2 is the primary and server1 is the secondary. If I open dnsmgnt on server2 and look at the Reverse Lookup Zones, ...
1
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1answer
67 views
Where did dedicated.abac.net. come from in my rDNS and PTR records?
So I followed this guide to the letter: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/RdnsForBind
I did so for 3 domains.
When I "test" the records and enter: host 64.150.176.81 on ...
6
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6answers
215 views
Should every IP address be reverse and forward resolvable?
Will there be trouble if non-server machines:
1. don't have forward addresses that match in-addr.arpa?
2. don't have forward addresses?
3. don't have in-addr.arpa PTRs?
0
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1answer
149 views
Disable DNS Caching PHP
I need to get the latest A records of a DNS in a script. The script is doing some monitoring operations. The Default TTL of DNS record is 5 minutes, but the monitoring script is running every minute. ...
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2answers
335 views
Email rejected for no rDNS by AOL despite having rDNS
I am having trouble while attempting to send a single email to an aol.com user. I get a rejection reply as follows:
Your message did not reach some or all of the intended recipients.
Sent: Wed, ...
1
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1answer
160 views
How to check current DNS records with Amazon Route 53?
I understand how records are created and deleted but I cannot figure out how to list all set DNS records with Amazon Route 53. I have checked the developer guide and cannot find anything on this. I ...
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3answers
588 views
How would I setup reverse DNS for 2 email servers?
I have an interesting DNS question (well interesting to me atleast).
I just installed an hmail server in our remote office to act as an MX backup in the event our exchange server goes down.
The 2 ...
1
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2answers
120 views
How to use the hosts file to make google.com resolve to bing.com on a single machine
I am having a little trouble understanding how to manipulate the hosts file. I am using IIS 7.5 and Windows Server 2008 RC2.
How can I make any requests from my machine to google.com resolve to ...
4
votes
3answers
115 views
What services require properly configured PTR records?
I manage a few DNS servers (Bind9, Windows Server 2008 R2) that are used internally. I have always taken the time to make sure that the correct corresponding PTR records were configured for Reverse ...
0
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1answer
412 views
Disable reverse PTR check in Zimbra and force accept from invalid domains
I've moved an older Sendmail/Dovecot system to a Zimbra community edition system. I need to be able to receive messages from certain standalone Linux hosts that may not have valid A records or proper ...
0
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1answer
141 views
reverse lookup not working with my own nameservers for any internet address
I have two DNS servers running. With internal addresses it is no problem to look them up both ways:
user@ns1:~$ man named.conf
user@ns1:~$ host vh01
vh01.example.de has address 192.168.180.4
...
3
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2answers
209 views
How are DNS PTR records managed?
As I understand it, an IP address-owner can set up a DNS PTR record for his IP address to map the IP addresses to its host names. There are some things about this I don't understand. I've managed ...
0
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1answer
117 views
rDNS mx record problem, smtp test fails
down vote favorite
I am doing test at mxtoolbox.com
ptr: ip -> mydomain.com
mx: mydomain.com ->myip
but smtp:173.231.15.144 -> OK - myip resolves to myip.hosted.static.hostingfirm.com / Warning - ...
2
votes
1answer
239 views
Reverse DNS not resolving for IPv6 addresses in BIND
Reverse DNS entries for IPv6 addresses are not working. Everything I've read on the subject says the following configuration should work:
In named.conf:
zone ...
1
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3answers
610 views
spam problem related to reverse dns config
I have a client whose ISP recently switched their circuit and static IP to an IP that was already blacklisted for SPAM (nice).
The client is running Windows SBS 2003 with Exchange 2003 and DNS for ...
2
votes
2answers
142 views
setting the reverse dns for a email server
'm having some trouble with email on a dedicated server, with Windows Server 2008. I've reached the conclusion I have to setup reverse dns for the mail server.
The current setup is this:
The mail ...
1
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1answer
70 views
setting the reverse dns for a email server [closed]
Possible Duplicate:
setting the reverse dns for a email server
I'm having some trouble with email on a dedicated server, with Windows Server 2008. I've reached the conclusion I have to ...
1
vote
1answer
621 views
How to configure Reverse DNS (PTR) records correctly for multiple domains on a single IP
I run a Virtual Private Server on which I host a number of websites using a single IP address. I need to configure Reverse DNS for each domain. Is this possible and what is the best way to go about ...
2
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2answers
121 views
DNS resolving error
I am using a linode running nginx. I wanted to have mail sending capabilities on my VPS, so I change the hostnames and reverse DNS but now I have messed up my DNS somehow and the site doesn't even ...
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2answers
291 views
How to setup reverse dns for Virtual dedicated server(godaddy)
I have a problem in resolving the domain and found out that there is a issue with dns settings.
I wanted to configure Reverse DNS for my virtual dedicated server(windows). My isp is godaddy.
How ...
0
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1answer
131 views
Mail deliverability rDNS best practice
I have an email server which sends email for multiple websites (different domain names each)
the reply-to will correspond to no-reply@website-a.com (or whatever their username/website is) but the ...
0
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2answers
627 views
My Reverse DNS PTR record seems to be right, but I'm still getting bouncing email
I have a service (statusme.com) where I let people know (for example) that their kid's soccer games are cancelled because of bad weather. We send out emails to the people who have registered.
I have ...
1
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3answers
580 views
SMTP host name vs. domain in “From:” address vis-a-vis Email Deliverability
I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: ...
0
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1answer
84 views
e-mail RDNS lookup
I'm getting lots of junk "return to delivery" mail on my server, so I would like to add this "RDNS" lookup thing in Ubuntu.
But I can't figure out how. Most documentation is about regular DNS ...
3
votes
3answers
1k views
Multiple PTR records
In your experience, have you found there to be any actual problems with having redundant PTR records (same name, multiple IPs) for a given host?
Additionally, would you expect to see corresponding A ...
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2answers
349 views
BIND9 reverse DNS, /16 zone
I'm trying to set up a reverse zone for the entire 10.200.x.x/16 subnet. I've configured everything according to named.conf and several different blog posts, but no luck.
Note that the A-records ...
