Server Fault Stack Exchange
Server Fault Stack Exchange

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.

  • See also:
561 questions
1
vote
1 answer

Caching BIND server not returning RFC1918 PTR records

We have a Debian stretch server running Bind 9.10 as a local caching DNS service to applications running on that server. This local caching DNS service sends its queries to our institution's main DNS servers. Our institution's main DNS servers have…
user35042
  • 2,681
  • 12
  • 34
  • 60
1
vote
3 answers

Reverse DNS required to send emails

I run my own email server (postfix) and my own DNS servers (bind) on openSUSE 11.2. Lately I've found that I cannot send email to Comcast users, apparently because they cannot do a reverse DNS on my IP address. I do have PTR records set up…
sschafer
1
vote
0 answers

PowerDNS AXFR - ;; communications error to x.x.x.x#53: end of file

Using PowerDNS, we got into an issue with transferring a single domain object (/24) from our primary to our secondary DNS server. This /24 is part of a larger RIPE block, /22, and is not automatically transferred. The remaining /24 domain objects…
Beeelze
  • 161
  • 6
1
vote
1 answer

Custom resolv.conf file

Is there any way I can specify a custom resolv.conf file (instead of /etc/resolv.conf) in RedHat Linux, similar to specifying custom hosts file via export HOSTALIASES=~/my_hosts? I don't have root access to the server. Background: I need my…
penguin
  • 39
  • 7
1
vote
1 answer

DNS is slow to resolve after force removal of a domain controller

On a Windows domain I recently had to do a "force removal" of a domain controller. I was careful to remove all the metadata and did a metadata cleanup. I also removed all references to the domain controller/dns server I removed on the remaining dns…
Mark
  • 131
  • 2
  • 14
1
vote
1 answer

Spamassassin - how to get a better score

I am testing a contact form, but I am getting a too high score for the emails sent from the contact/booking form. Here is the header: Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07)…
Pikk
  • 339
  • 1
  • 6
  • 19
1
vote
1 answer

Why does sssd break PTR records for AD-joined CentOS

I have an AD domain-joined CENTOS 7 box - call it centosbox. Whenever SSSD starts, it updates the DNS records, which is fine by me, except that it breaks the PTR records by making them point to just centosbox. instead of centosbox.my.domain.ext.,…
dodexahedron
  • 137
  • 12
1
vote
2 answers

Postfix: forced reverse lookup for incoming connections

I see following maillog records when new mail comes to server connect from unknown [209.85.223.195] client=unknown[209.85.223.195] But that IP address is GMail IP and it has valid PTR-record which points to mail-io0-f195.google.com My main.cf is…
Twissell
  • 70
  • 1
  • 13
1
vote
1 answer

nameservers reported by whois cannot be found by nslookup

The nameservers of my domain are listed correctly on the whois entry: whois destiglobal.com | grep NS gives the following result: Name Server: HEATHER.NS.CLOUDFLARE.COM Name Server: OWEN.NS.CLOUDFLARE.COM but a nameserver search with dig does not…
matyas
  • 113
  • 4
1
vote
1 answer

Amazon SES/Mailgun and Reverse DNS lookups for email

I am working with a client who sends out emails to clients (password reset, employee invitations, etc.) using Mailgun, but we are getting a some emails blocked due to reverse DNS lookups for the Mailgun ip address. I have looked into using AWS…
Halcyon
  • 113
  • 4
1
vote
0 answers

Postfix is unable to resolve IP addresses when running in chroot on Debian Stretch

I was trying to setup my own mailserver and for some reason or another postfix is unable to resolve names or IP addresses when running in chroot. I tested this on a vanilla Debian Stretch/postfix installation. My postfix conf: # postconf…
TylerDurden
  • 191
  • 1
  • 3
  • 14
1
vote
1 answer

ISC-DHCP and Bind9: DDNS update fails for reverse map (NOTAUTH)

I use the isc-dhcp-server with this configuration /etc/dhcp/dhcpd.conf: ddns-updates on; ddns-update-style interim; include "/etc/bind/rndc.key"; authoritative; zone bat. { primary localhost; key rndc-key; } zone lan.bat. { primary localhost; …
kiigass
  • 133
  • 1
  • 5
1
vote
0 answers

dig +trace does not map IP addresses to host names

I manage four different public nameservers. I have noticed that two of them will map the IP addresses to host names in the Received lines when using the dig +trace command from the server command line and the other two do not. How can I ensure that…
Jim Holland
  • 11
  • 1
1
vote
1 answer

Reverse DNS for multiple IP address with same domain name

We have a setup where our day-to-day email is sent via GSuite for Business and our bulk email (newsletters, etc) are sent through an Exchange server (to avoid Google's sending limits). Both are sent from the same domain name but with different IP…
James
  • 111
  • 1
  • 3
1
vote
1 answer

Cannot resolve hostname of devices connected to a wireless network using ip address ** server can't find x.x.x.x.in-addr.arpa.: NXDOMAIN

I'm trying to resolve the hostname of devices connected to my wireless lan network through their ip addresses. I'm using a macbook and my /etc/resolv.conf show this as my dns server (192.168.1.1) which is a wireless router #This file is…
Arun Sampath
  • 11
  • 1
1 2 3
…
37 38