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Questions tagged [reverse-dns]

Reverse DNS lookup is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.

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 process is also known as forward DNS resolution. Reverse DNS lookup is the inverse process, the resolution of an IP address to its designated domain name.

Source: Wikipedia.

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Configure reverse DNS on AWS Route53, should I use public or private ip?

Ive noticed that emails send from my SMTP server ends up in spam folder because of a missing reverse DNS. The server is hosted on AWS, so is its domain and DNS (Route53). In the official guide for reverse DNS configuration, Amazon explains the…
Vingtoft
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CNAME as different domain name

I've a query with regards to CNAME record, can I have a CNAME as different domain name? Ex. I've a website example.com, can I create a CNAME with example.net? So, irrelevant of what end user types (either example.com or example.net) they should…
Aniruddha
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How to set up mx records

So I bought a new domain name from GoDaddy and pointed the domain to my VPS IP Address which works fine. [Please note, the VPS is not hosted with GoDaddy, just the domain name.] However, I noticed that all incoming mails from external servers…
AndrewL64
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Need help for configuring a dns server

I want to run a dns server to have my own nameservers : ns1.radicalteam.ir and ns2.radicalteam.ir I have a VPS and installed Centos 6.5 on it, and radicalteam.ir and soulati.ir domains I've set soulati.ir nameservers to ns1.radicalteam.ir and…
Mostafa Solati
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Do ns1 & ns2 nameservers need a PTR record?

I wonder whether my 2 nameservers need a PTR record. As you may know the PTR record or reverse DNS is important for mail server hostname as it improves chances for your outgoing emails to be accepted by major email providers. I also wonder if there…
Nicolas Guérinet
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Sendmail not sending emails

The Apache server I've inherited from my predecessor doesn't send emails. When a web application hosted on the server needs to send an email, it blocks all other processes while it tries to send it (giving the appearance to the user that it's…
TimothyBuktu
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Is OpenDNS safe to use in a location with Exchange/Reverse DNS

I like OpenDNS, but was wondering if anyone has experience deploying it for a location with an Exchange installation. I'm concerned specifically about whether any filtering they do would cause problems with reverse DNS lookup that might interfere…
nedm
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PTR record format for IPv6

What is the difference in the following two IPv6 PTR formats? 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR smtp.example.com. 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.0.a.4.f.7.0.6.2.ip6.arpa. IN PTR smtp.example.com. If…
user53029
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WARNING: At least one of your NS name does not seem a valid host name

So here is the issue I am having. When I run a DNS check on my TLD I am getting conflicting results. The domain name is newage.design and my NameServers are NS1.newage.design, NS2.newage.design, and NS3.newage.design When I run the DNS check I get…
Tyler Radlick
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Linux PCs sending "ICMP udp port unreachable" to DNS server

So digging around in my syslog I have been noticing a lot of ICMP packets being flagged by our ASAs: %ASA-4-313005: No matching connection for ICMP error message: icmp src Internet:x.x.21.122 dst MGMT:x.x.36.55 (type 3, code 3) on Internet…
JustNobody30
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Removing DNS entries

I've got the following DNS records and I would like to ask if it is OK/safe to remove the unwanted entries: admin/ftp/m/mail/webmail (I hope the mail one doesn't affect the emails?) @ IN NS ns0.domainname.com. @ IN NS ns1.domainname.com. @ …
user3465843
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Postfix on server with multiple IP addresses sends mails with wrong HELO in header

I have a VPS with multiple IP addresses: venet0:0 x.x.x.2 venet0:1 x.x.x.3 venet0:2 x.x.x.4 venet0:3 x.x.x.5 All IPs have A records m2.domain.com -> x.x.x.2 m3.domain.com -> x.x.x.3 m4.domain.com -> x.x.x.4 m5.domain.com -> x.x.x.5 and rDNS…
Vladimir Dimitrov
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mx server: multiple domains on one ip

I'm just a bit confused about the correct DNS setup for hosting multiple domains on a single server with one ip. For example the mail server (domain/reverse: example.com) should host 3 domains: example.com domain.com test.com So whats the correct…
Xairoo
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Is it possible to set a PTR record for Github Pages hosting?

Icelandic domains (.is) require that their domains support reverse DNS, which means configuring PTR records on the hosting server. Is it possible to set up a PTR record for GitHub Pages site hosting? Background: I have an Icelandic top-level…
peteorpeter
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Cannot load reverse lookup zones containing "rich-text" PTR records

Summary I am attempting to set up Wide-Area Bonjour (aka DNS-SD) using ISC Bind 9.9.5, but cannot load reverse lookup zones providing discovery of "rich-text" service domains. Background According to Discovery of Browsing and Registration Domains…
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