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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IPREV check failing on multiple ipv6 addresses

I'm using a Raspberry Pi 5b running Ubuntu to host a Postfix and Dovecot mailserver from my home. After setting up various sender authentication mechanisms on the server eg. SPF, DKIM and DMARC - and ...
Oliver Ricketts's user avatar
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2 answers
73 views

Proper rDNS in a multidomain server using the same IP

I have a server with one IP 92.150.180.250. I have 60 accounts. The host name is 92-150-180-250.hosted-by-myserver.com and the rDNS is exactly the same. All domain DNS records are following the ...
Νικηφόρος Μπάφας's user avatar
1 vote
2 answers
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nslookup returns SERVFAIL error from local DNS

I'm configuring Nginx and local DNS settings on Ubuntu 22.04. The DNS server running on Docker has an error. When resolving a domain name, the Docker DNS server returns, SERVFAIL. nslookup ns.main....
juanthehuman's user avatar
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Mysql client using reverse DNS instead of IPv4 address when connecting to remote db [duplicate]

I have a server on Hetzner. When using the MySQL client to connect to a remote db from cli of that server, it returns the error: Access denied for user 'user'@'static.x.x.x.x.clients.your-server.de' (...
SYSTEMD's user avatar
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Why is PTR needed in DNS, instead of using a service record or an MX record?

Why would an organization with an email system have a requirement that a system sending email to it needs a PTR reverse lookup DNS record of the IP address of the sending email server? Can the ...
ARGYROU MINAS's user avatar
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dns reverse proxy for resolving txt records

Is this possible if multiple urls are pointing as CNAME to a same URL and should resolve different TXT records based on the input url eg: sample.somedomain.com -> mydomain.example.com -> TXT ...
venkat S's user avatar
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Specifying IP Address for DNS Migration to Cloudflare

I am currently in the process of migrating my DNS to Cloudflare, and I've encountered a bit of a snag that I hope some of you might be able to assist me with. I am managing a domain registered in ...
Jose A. Matarán's user avatar
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Setup Reverse DNS for a VPS host on a public network

Bassically, I'm trying to revive this question that got no correct answer: reverse DNS (bind) for single ip/machine on non-private network So, I am trying to configure my own public DNS server for ...
Bestmank's user avatar
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Too many connect from unknown postfix

I am trying to set up an incoming email server by using postfix as MTA the issue I am facing is that there are too many 'connect from unknown' lines in the log. Can anyone help can I debug this issue? ...
SUNITA GUPTA's user avatar
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How to add a PTR (Reverse DNS) on Vultr? Do I need to contact them?

I have set up a Postfix Dovecot email server on my Vultr. And I'm getting following message from Google: gmail-smtp-in.l.google.com said: 550-5.7.1 Our system has detected that 550-5.7.1 ...
岁月倾城197's user avatar
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Getting "has no address records (A or AAAA)" error when running named-checkzone

I am currently trying to build my own home lab for the first time, and as a newbie it’s been a bit confusing. For the past few days, I have been working on configuring an internal DNS server, and ...
DiamondFeather's user avatar
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109 views

Why is bind9 not responding to reverse zones to anyone?

There is BIND 9.11.5-P4-5.1+deb10u2-Debian (Extended Support Version) <id:998753c> for the local network, it works as a caching server and holds several domain zones. Recursive requests are ...
Max Fetcher's user avatar
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3 answers
547 views

How to avoid reverse DNS errors

I am running a mail server (Exim) on a VPS (Ubuntu 22.04 LTS). I am able to send and receive emails without problem, but I do get the following errors from mxtoolbox.com: Reverse DNS does not contain ...
Bruce Button's user avatar
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AD reverse DNS zone sharing between subdomains

We have Active Directory infrastructure with one domain and several subdomains. Each subdomain has its dedicated subnets. All DNS servers on DCs have appropriate reverse zones, integrated in Active ...
Dmitry Donskih's user avatar
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295 views

Reverse DNS propagation and caching

I set up a VPS (Ubuntu 22.04, at Contabo in Germany) yesterday. Unfortunately, I got the reverse DNS entry incorrect (I entered example.org instead of example.uk). I spotted this quickly, and ...
QF0's user avatar
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How to disable or fix OpenStack intercepting DNS PTR queries

I have several virtual machines with Debian/GNU Linux running on OpenStack. When resolving their internal IPv4 addresses I get some strange results: # ip -c addr show dev eth0 2: eth0: <BROADCAST,...
pmhahn's user avatar
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reverse file not working . gives error message "bad dotted quad"

here is my zone file $TTL 86400 @ IN SOA master.git-gotech.net. root.git-gotech.net ( 0 ; serial 3600 ; ...
jessica mbenji's user avatar
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1 answer
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Are IPv6 forward and reverse maps required if they match the ipv4 addresses when using bind9?

Using bind 9.18, my named.conf has something like this: zone "my-domain.com" { type master; file "/usr/local/etc/namedb/master/my-domain.com.zone"; }; zone "32/29.114.115....
Gary Aitken's user avatar
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1 answer
4k views

Resolve-DnsName resolves hostname of IP, but nslookup fails

There are some IP address that nslookup can't resolve (both on Windows and Linux). Problem: I can find the IP of the hostname, but reverse lookup fails. PS C:\> nslookup.exe somehost2 Server: ...
aviro's user avatar
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Bind: (Reverse) zone not loaded due to errors

Using Ubuntu Server and bind9... Here's the error: enter image description here Direct zone: enter image description here Reverse zone: enter image description here Named.conf.local: enter image ...
Sergio Diaz's user avatar
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1 answer
388 views

Unsure on how to fix PTR [closed]

I am trying to setup a custom email for a company website. The only issue is that when sending an email to a gmail account, I get the following back: The mail system : host gmail-smtp-in.l.google.com ...
Learner's user avatar
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0 answers
327 views

GCP/Google DNS: delegate a subdomain and set PTR records on VM instance

I am having a hard time figuring out what steps are needed to set a PTR record on a VM since I want to run a mailserver on it. My scenario looks like this: (unfortunately because of planned migration)...
mr.szop's user avatar
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1 answer
116 views

Windows DNS - Reverse resolution not working for public IPs

I was troubleshooting an internal application when I discovered that the reverse lookup only works for internal private IPs. Is there a way I could configure our Microsoft DNS servers (Win2016) to use ...
YaKs's user avatar
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DNS Zone has no address records (A or AAAA)

Whenever I run systemctl start named.service I get the error: zone example.com/IN NS 'linserver-1.myco.example.com.example.com' has no address records (A or AAAA) Now the confusing thing for me is ...
Ryan West's user avatar
0 votes
2 answers
164 views

Where to setup reverse DNS for email server

I plan to host my own mail server on a VPS. I understand that I need to set up a reverse DNS entry to prevent commonly used mail services from categorizing my email as spam. Where should the reverse ...
mr_js's user avatar
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1 answer
972 views

BIND9 local reverse lookup with public IPs - is the setup broken or is the setup faulty?

We are having a prelaunch-site to test DNS (and other services) before going hot. I've never involved public IPs here previously and it may not work as I've intended. We have a /29-net from our ISP ...
Joppe's user avatar
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1 vote
1 answer
1k views

Fix rDNS record using PostFix and Cyberpanel

My email is being rejected by GMail because: 550-5.7.25 The IP address sending this message does not have a PTR record setup, or the corresponding forward entry does not point to the sending IP. I ...
MindSpiker's user avatar
1 vote
2 answers
764 views

2 IP's with the same PTR record?

Can I have 2 IPs with the same PTR Record? For example: 122.122.122.1 with PTR Record mail.example.com. 122.122.122.2 with PTR Record mail.example.com. Each IP-address is with a different ISP, the ...
Jorge Enrique Garzon's user avatar
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1 answer
602 views

Email goes to spam even with valid SPF, DKIM and DMARC records, dynamic rDNS on AWS instance

I have an instance on AWS and fighting with sending emails through cPanel. All records are OK (checked on MX toolbox): SPF, DKIM, DMARC at the cPanel level and the WHM level (hostname). Even rDNS is ...
Adrian P.'s user avatar
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1 vote
1 answer
50 views

Single server, single IP, mail with other services -- do I need a mail subdomain?

I have a server with a single IP configured to act as a mail server and to provide other services (e.g. http). DNS records are like: mail.example.com A 192.0.2.4 example.com MX mail.example.com and a ...
tsj's user avatar
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2 answers
118 views

Name server change, impact analysis and down time - worst case

The company I am working for is changing the name servers our registrar points to and wants a complete impact analysis in worst case scenario to impacted systems. I know if we update the TTL's and ...
axawire's user avatar
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1 answer
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Pinging NGINX with virtual hosts returns the wrong domain name

Just as the title says - I'd like to know how to specify either: How to return the domain that is pinged (e.g. if I ping "test.com" I get something like "64 bytes from test.com..."...
jfacemyer's user avatar
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0 votes
1 answer
330 views

Can't connect Namecheap domain to VPS server

I recently bought a domain name from Namecheap (pythonbiz.com) and I set up a web app on a VPS hosted at servercheap.net (a Ghost blog which is basically a Node app), the VPS public IP address is 107....
 Annis99's user avatar
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0 answers
334 views

Strange delayed bounce to Gmail user sending to an alias on my system that expands to other Gmail addresses

Config: Postfix on a Linux machine, static broadband address but because it's residential service, the provider will not provision reverse DNS PTR records for us. We're working on alternatives, but ...
Kellarnen's user avatar
0 votes
1 answer
335 views

Should I create reverse zone in bind9 if I don't have authority over the ip address?

But I don't manage the ip address blocks... I have 2 dedicated servers each in different data centers the first provider offers me a panel to configure the reverse zones myself, in this case if they ...
Andrés Alvarez's user avatar
1 vote
1 answer
411 views

Should I create reverse DNS record for virtual domain?

My server has two domains, example.com and example.org. example.com using my server to send emails. example.org is a virtual domain. And it uses Google Workspace(Gmail) to send emails. I see this ...
alancc's user avatar
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0 votes
2 answers
253 views

ns1 and ns2 are in different subnets, do I need two reverse zones?

I will make an example: ns1.example.com = 172.27.175.64 (local ip address) ns2.example.com = 192.168.1.10 (local ip address) (Obviously it is an example and they are with local IP addresses, but in ...
Andrés Alvarez's user avatar
2 votes
0 answers
162 views

When does unbound fully drop expired cache

How long it will hold expired cache before dropping it? Is there any way to prefetch expired cached instead of dropping it?
zer09's user avatar
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0 votes
1 answer
260 views

reverse nslookup attach arpa zone to response

I have an issue that some reverse (PTR) resolution reattach in-addr.arpa zone to response.This is something wrong in the named(bind9) configuration. Now is : command : dig -x 10.1.1.107 @dns_server_ip ...
popeye33's user avatar
0 votes
1 answer
353 views

BIND9 how to have 2 reverse resolutions for 2 different domains

I have one server Bind9 and 2 different domains. I'ld like to have reverse resolution for each domain. I've tried this configuration below but I get the error in named-checkconf : /etc/bind/named.conf:...
nguxx's user avatar
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-1 votes
1 answer
852 views

Nslookup server: unknown between VLANs/networks?

I have several VLANs/networks - eg.: 10.0.10.0/24 : Servers 10.0.20.0/24 : Pcs My DNS server is called "DC1.mydomain.local" (IP 10.0.10.11) and I have a PBX server called SVPBX (IP 10.0.10....
MojoDK's user avatar
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0 votes
1 answer
309 views

force mysqld to use etc hosts for reverse lookup

I have a server hosted by hetzner running mysqld. I already setup some "ddns for poor ones" to add my dial-on IP (Telekom) to the server's /etc/hosts. Now all Users in mysql are limited to ...
Synopsis's user avatar
4 votes
3 answers
3k views

Configuring a PTR record in domains.google for an SMTP server

I've found several threads related to this, but they are all very dated so I want to get some clarification. I use an AWS ec2 instance with an elastic-ip, I've set up an SMTP (sendonly) mail-server ...
David N's user avatar
  • 45
0 votes
2 answers
1k views

zone file error and named does not start

we have deployed a new zone on our dns : named.conf for the new zone (like others) zone "db.0.30.10.in-addr.arpa" { type master; file "/etc/named/...
popeye33's user avatar
1 vote
1 answer
511 views

email validation: is there any point doing both SPF *and* reverse DNS tests?

For a receiving MTA, it seems to be unnecessary to check both the SPF record for an incoming SMTP connection, and to do an rDNS/PTR lookup. Consider: Server gets SMTP connection from aaa.bbb.ccc.ddd, ...
QF0's user avatar
  • 203
0 votes
2 answers
712 views

How to disable reverse DNS lookup in Apache 2.2 or in recursive bind

I would like to stop Apache (2.2) from doing reverse lookups for client IP addresses. I have HostnameLookups Off and LogFormat "%h %l %u %t %V \"%r\" %>s %b \"%{Referer}i\"...
Ján Lalinský's user avatar
0 votes
1 answer
34 views

I need to have my 2 websites to have an individual rDNS record but they both are running on the shared web hosting servers

I'm a server noob and want to get some solution or some advice from the gurus of the ServerFault. I currently have two different live websites running and they both are using the shared web hosting ...
hansf14's user avatar
0 votes
1 answer
597 views

What should be the rDNS PTR records for a self-hosted email server with a website domain hosted elsewhere? [duplicate]

We have a self-hosted mail server at our business's single, static IP address (mail.companyA.com). Our website is hosted by another company at a different IP address (companyA.com). Our emails use the ...
Brian's user avatar
  • 3
1 vote
2 answers
2k views

BIND9 Forwarding Reverse DNS

I've set up a BIND9 DNS Server. It should only do forwarding: local.domain1 - forwarders 172.24.16.10 / 172.24.16.11 local.domain2 - forwarder x.x.x.x internet - forwarders 8.8.8.8 / 8.8.4.4 My ...
tm1978's user avatar
  • 11
0 votes
1 answer
1k views

BIND9 server for a network with no internet access

The question I have is the same as this one, but the accepted answer, and the comments did not helped me solve my issue. I'll put here the whole setup that I have. BIND9 version - BIND 9.11.5-P4-5.1+...
Julian Dimitrov's user avatar

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