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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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SSL & Reverse DNS

Just a quick question...I really need an SSL cert in order to make my cell phone work with my mail server. Security is a non-issue, this is just for convenience. My mail server's FQDN is mail.company.com but a reverse DNS lookup for that address…
Mike Dawes
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Reverse DNS and Mailserver and self generated certificates

this is my first question here, so don't kill me if it sounds stupid. I don't know much about server administration, that's why we booked a managed server to host our clients. So far we have been to setup most of it but I am concerned about the…
Mtm Project
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How to append a domain to a PTR resolution?

I have a bind9 server authoritative for my domain example.com. Forward resolution works, PTRs as well up to a point. I currently have 254.10.10 IN PTR srv. in my PTR zone for 10.x, which correctly resolves to root@srv ~# dig -x…
WoJ
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How to share NFS4 + Kerberos with dynamic IP and dynamic-dns setup (rdns doesn't work)

I have two linux machines. One is a machine behind a typical dynamic IP cable modem + OpenWRT router. The machine behind the NAT regularly updates a forward DNS record via an API call with my provider (ie. there is a dynamic DNS set up to identify…
dlakelan
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DNS server forward all queries except the queries for reverse DNS

I would like to set up DNS server(bind) on debian. Which will forward all queries to google, except the queries to reverse DNS for specified zone. I would like to respond queries for group of hosts named "clients" on my server, and all the others…
user381297
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Domain Admins not able to registerdns while Local Admin is

To register dns we run ipconfig /registerdns, as I understand the user should have Administrative privileges to run the above command in an elevated prompt. So when I run registerdns with LocalAdmin account it works fine but when I run it with…
Eager 2 Learn
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nslookup returns IP, but can ping hostname

I have a Windows 2012 R2 server that I'm using for DNS. My forward- and reverse lookup zones are correct and the problem is not with the DNS config (tested on the server as well as other Windows clients). The problem is that I cannot ping a device…
ChaChaPoly
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Is it ever preferable to have a server without a DNS PTR record?

Other questions on this site explain why it's helpful to have a PTR record, and why it's unhelpful to have multiple of them. Are there any real-world situations where a server with one or more A records is better off not having a PTR in the reverse…
Foo Bar
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Why do email headers show the wrong IP address from my Exchange server?

Please help me re-frame question for positive use if needed, thank you I use two domains mail.hpdist.com and mail.hpsteaks.com. I am a little unsure how to properly walk through the testing as it seems to me it is setup correctly. Both domain names…
Seth
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SMTP: Received from unknown [xxx.xxx.xxx.xxx] -> but IP does have a valid PTR/RDNS

I got the following problem. I got an smtp-relayserver that collects outgoing mails from other servers and checks them (spam assassin). Now the headers are showing this: Received: from customerdomain.com (unknown [xxx.xxx.xxx.xxx]) (using…
MyFault
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The incompatibility between Cloudflare and the reverse DNS

I'm already activated Cloudflare for my website and to apply that I had to replace my domain default nameservers with Cloudflare nameservers. Now my website has to send emails to the mail servers, but I have a problem with that, especially with the…
Zorba
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Configuring private name servers and reverse DNS

I have a VPS setup to host five domains from a single IP address. After some help from a previous post here, my DNS for the main domain has this configuration: ; cPanel first:11.34.2.8 (update_time):1458686884 Cpanel::ZoneFile::VERSION:1.3…
Harley H.
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FCrDNS for a mail server that also runs other services (http, ftp etc)

I am learning how to administer productive internet-facing machines and services, and towards that end setting up mail, web, and a couple other services, all on the same box (budget constraints and simplicity). My question relates to: SPF, FCrDNS,…
ArjunShankar
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No PTR record according to gmail

Recently, I installed iredmail on my VPS and configured DNS records (including ptr). It confirms nslookup: nslookup zelenin.top Name: zelenin.top Address: 191.101.251.182 nslookup -query=mx zelenin.top zelenin.top mail exchanger = 5…
Vladislav
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Can I Run My Web Service and DNS Service on the Same Server?

I am quite new about Linux. I wonder if I could run DNS and Web Server on the same server? The reason is I have a server which they want me to set it up as a DNS & RevDNS server with the following spec; HP Proliant DL120 Gen9 E5-2603v3 1.6GHz 6…
Lunatic Fnatic
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