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.

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DNS, nameserver and domain on the same dedicated IP - PTR record for nameserver?

My dedicated IP: xx.xxx.xxx.59 Am I doing this correctly by having 2 PTR records (ns1 and domain) for my IP? Reverse DNS Zone file 59.xxx.xxx.xx.in-addr.arpa.db $TTL 86400 @ IN SOA ...
Myroslav Tedoski's user avatar
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4 answers
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in-addr.arpa zone delegation in Bind 9 and Samba 4 as an AD DC with DDNS

Environment and goals In my testing KVM lab I have a virtual network 172.16.50/24, in this network I have got 2 Centos 7 VMs running Bind 9 and ISC DHCP servers: Мастер DNS : controller.wsvirt.home (...
treegor's user avatar
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How to remove DNS Resolution in Haproxy

I have got in a situation where hosts mentioned in the haproxy are resolved into it's ip and sends the request. But in host's server, where they have configured to receive request only with the host ...
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Why create a reverse DNS record for every device that connects to a wireless network?

There's this network I connect to often. After some experimentation, I figured out that when you connect to the network, the DHCP server assigns you an FQDN that usually follows the scheme <your-...
kimbo's user avatar
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Understanding TTL field of PTR record returned by dig client

I have some doubts about working of DNS in general - even given the fact I have theoretical base. let's consider a following output: [user@host ~]$ dig google.com [...] ;; ANSWER SECTION: google....
DNS question's user avatar
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Who is responsible to set up reverse DNS (PTR) for a domain, the DNS host or the MX host?

I have the dns for a domain on GoDaddy and the MX configured for Gmail. All set up ok with spf, dkim and dmarc, and all passes all online tests, beside: intodns.com reports this error for the domain ...
jamacoe's user avatar
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Can't send email to some servers

I get this error below, after I send email to some domains including charter.net SMTP error from remote mail server after MAIL FROM:<******@mydomain.com>: 550 5.7.1 Connections not accepted ...
Xel Naga's user avatar
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What is Wrong with My Reverse Lookup PTR Record

I can't figure out why my PTR record does not work on my new server. This configuration worked on my old server and I already confirmed with my host that they added a record on their end so that 72....
CopBlaster's user avatar
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2 answers
180 views

Client PCs cannot connect with DCs on specific ranges

Sometime last week (while I was on leave) something changed in my network/domain which I cannot pinpoint and we have the below behavior. My 2 DCs are 2008 R2 and are on a 10.2.128.0/24 subnet (as ...
tfonias74's user avatar
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PowerDNS Not Answering Reverse Lookup Queries

I have PowerDNS Authoritative & Recursor running on a server in my environment. When I use this node as my a DNS Server, it responds to A record queries without any issues. However, when I attempt ...
TJ Zimmerman's user avatar
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SPF and IPv6 fails even if the reverse DNS is created

When sending mails to Gmail I get this error Received-SPF: fail (google.com: domain of [email protected] does not designate 2a01:4f8:xxx::2 as permitted sender) client-ip=2a01:4f8:xxx::2; When I ...
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BIND cannot see local client PCs and vice versa

I'm trying to configure bind9 DNS to make it usable for my tiny network of windows PCs in order to create Active Directory DC on samba. For some reason I am getting "ignoring out-of-zone data" for ...
domaniqs's user avatar
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Deny foreign domains requests with bind9

I have 2 bind9 servers adjusted as Authoritative-Only DNS Servers. I've noticed that dnstop shows a lot of requests for foreign financialresearch.gov domain (not mine). There are more than 50k ...
Anton Lukin's user avatar
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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 ...
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Should full hostname of email server be set in the DNS Zone Settings?

We are using a rented VPS as an email server. Lets say the email domain is example.com. The nameserver for example.com is a different server. rDNS for the VPS can be set on the hosting side. In order ...
Paul McCabe's user avatar
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Using multiple PTR (rDNS) on a GC Instance

Setting up multiple reverse DNS entries is super simple in linux but I cannot find documentation on doing it in google cloud. I see how to add one, but not how to add several. The server hosts ...
user206106's user avatar
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DNS Manager, how to add an internal IP address to point to Office365 SMTP URL

Here's the short version: I'd like to add some sort of record in DNS Manager such that all SMTP messages sent to an arbitrary internal static IP address get sent instead to the URL smtp.office365.com ....
Disco's user avatar
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How to set up a reverse mapping zone for a personal domain?

I've been trying to figure out how to set up a reverse zone based on an already existing forward zone, but I keep getting an error saying server can't find xx.xxx.xx.xxx.in-addr.arpa: SERVFAIL ...
Al Fney's user avatar
22 votes
1 answer
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How can this tool find out registered domains from an IP address?

This is one that I've never really known how to do, and it's been nagging me from time to time for years. I've read all I could find, including all the answers here. None of them gives a real answer ...
Neithan Max's user avatar
2 votes
1 answer
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Is an rDNS PTR record really necessary to avoid spam filters?

I realize this is a somewhat abstract question, but does anyone have any experience with setting up an e-mail server without an rDNS record? I ask because I really want to host my mail server at home,...
Steffen's user avatar
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dnscache does not return PTR records

I am working on setting up tinydns to serve DNS data for my local network (several virtual machines, actually) and dnscache to serve both data about my local network and big internet. So, here is my ...
KAction's user avatar
  • 101
3 votes
1 answer
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rDNS issue in Cloudflare and AWS ec2 instance

I have installed centos7, whm/cpanel and mailwizz on amazon ec2 instance, managing DNS through cloudflare.com. Everything is fine i have issue with rDNS even i have created PTR records in Route53 and ...
Wasif's user avatar
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[DNS][BIND9] Forward to external IP when clients request external domain name

So, I have some dns where I have setting with many internal zones for my domain yyy.com. And I need add record to provider server (host - with configuration files to download, this not some DNS like ...
DevAxeQuestion's user avatar
-5 votes
2 answers
654 views

domain name system - rDNS is not exist [closed]

I need some help with Reverse DNS as I have got a problem with it. I have setup rDNS on my hosting provider which I use rdns1.example.com and I have a server hostname which it is gateway1.example.com. ...
Robert Jones's user avatar
1 vote
0 answers
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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 ...
Beeelze's user avatar
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MTA poor reputation [duplicate]

I'm facing MTA poor reputation and I'm fighting against it since days without success. MTA poor reputation had plenty topics so I verify/modify many aspect of my configuration such as: Verify ...
g.rami's user avatar
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rDNS -- more than one IP per server?

Very simple question that I can't find a reliable answer to, with Google -- can my server be the reverse DNS for multiple IP addresses? Is it bad practise / wrong / asking for trouble to say my ...
Martin's user avatar
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2 votes
1 answer
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Nginx bind to external IP only (listen hostname:port)

I'd like to specify an nginx server that listens only on external IP of an hostname given in listen directive. My server has domain name foobar.example.com which resolves to public IP 1.2.3.4. When I ...
woky's user avatar
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Having multiple A records to get forward rDNS to work

Running a Droplet on DigitalOcean with Apache and a mailserver on Ubuntu. I've managed to get SPF, DKIM and DMARC working on this server, but Reverse DNS is something that I've never figured out. I ...
John Doe's user avatar
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3 votes
1 answer
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PTR not showing in dig request

I am trying to set up a PTR for reverse DNS so that mail that gets sent from me scripts doesn't get blocked due to reverse DNS failure. I beleive my zone is set up correctly, however me "thinking" it'...
Zak's user avatar
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1 vote
1 answer
261 views

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 ...
penguin's user avatar
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ISC-DHCP-SERVER adding incorrect reverse zone entry

I have ISC-DCHP-Server and BIND9 running on Debian Stretch. I am trying to setup Dynamic DNS for my client computers, but I'm struggling with the reverse zone. Currently, when computers request an ...
Canadian Luke's user avatar
-2 votes
2 answers
2k views

How to set up external DNS?

I have few appliances that are HTTP/HTTPS managed and assigned PUBLIC IP ADDRESSES and I need to set up DNS name resolution so I can access externally by it's name. How to set up external DNS?
Nroot's user avatar
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1 vote
1 answer
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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 ...
Mark's user avatar
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distinct mail and web hosting servers with multiple domains; spam-avoidance, PTR and SPF records

Context. I have multiple domains web services being hosted on a Digital Ocean droplet (Ubuntu and Nginx in stack). Apparently, DO automatically sets up a PTR record. However, when I query host <...
Jerome's user avatar
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3 votes
2 answers
6k views

Windows AD DNS is automatically adding PTR records for CNAMEs and I want this to stop

Preface: I am not a Windows admin. I am a Linux admin. I have a Windows 2016 server with AD DNS that handles internal DNS forward and reverse lookups. Somewhere, somehow, some process is ...
JDS's user avatar
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1 vote
1 answer
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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: <[email protected]> ...
Pikk's user avatar
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2 answers
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PTR record only visible on two public name servers

I submitted a request to an ISP (CableOne) to have a PTR record created.. 160.2.202.58 mail.huntleylaw.com I've queried 30+ Public DNS servers and I've only been able to find the PTR record on two.....
Nathan's user avatar
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0 votes
2 answers
181 views

How does MS know which public IP addresses are dynamically assigned [duplicate]

I came across this article which says that Microsoft is blocking SMTP from dynamically allocated public IP addresses. https://support.microsoft.com/en-us/help/886692/microsoft-com-now-blocks-...
user2629636's user avatar
0 votes
1 answer
302 views

How to change the name displayed in reverse dns lookup for exchange 2011

When I run this command ping -a <some-ip> I get this result: Pinging x.y.com [ip-address] with 32 bytes of data: The IP address points to my SBS 2011 Standard. Where can I change the name x....
Peter VARGA's user avatar
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Bind9 Has no NS records and Not loaded due to errors

This is my config Zone file ; ; BIND data file for local loopback interface ; $TTL 604800 @ IN SOA ubuntu. root.Lordi.local. ( 201806282 ; Serial ...
Wesley Israel's user avatar
1 vote
1 answer
2k views

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 ...
dodexahedron's user avatar
1 vote
2 answers
2k views

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 ...
Twissell's user avatar
0 votes
0 answers
2k views

Active Directory reverse DNS zone for multiple subnets

Hi have an Active Directory domain spanning multiple subnets, for example: 192.168.1.0/24 is the main site; 192.168.10.0/24, 192.168.11.0/24, etc. are branch offices. Actually, the (AD integrated) ...
shodanshok's user avatar
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1 answer
647 views

Google cloud load balancing and reverse DNS

I have a domain example.com pointing at a Google Cloud load balancer. Requests get served by one of several Compute Engines behind the load balancer. The load balancer ip is 1.2.3.4 Now when I send ...
Stewart Megaw's user avatar
0 votes
0 answers
149 views

Fowarding web applications according to domain name from IIS to Glassfish or Apache

I have installed three HTTP servers (IIS, Glassfish4 and Apache2.2) on a single windows-OS-based VPS. And I have three domain names (www.mysampleglass-domain.com www.mysampleapach-domain.org and www....
Bellash's user avatar
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1 vote
1 answer
396 views

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....
matyas's user avatar
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0 answers
313 views

BIND9 reverse lookup failing for just one zone all other are working fine

BIND9 reverse lookup failing for just one zone all other are working fine. I am setting up an internal DNS server with below config. I have added reverse files for /8 networks. zone "test.com" { ...
Aman's user avatar
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0 votes
1 answer
6k views

DNS RCODEs. Unexpected on Remote Machines

Could anyone advise on the following entries, please. What does those mean? What is mis-configured here? Please, note that it does not say "resolving errors" or something after refused and serfail. ...
Dennis's user avatar
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2 votes
1 answer
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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 ...
Halcyon's user avatar
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