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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.

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Getting SERVFAIL / NOTAUTH on Zone Transfer - ISC BIND 9

I have two BIND servers running BIND 9: BIND 9.11.36-RedHat-9.11.36-3.el8 (Extended Support Version) <id:68dbd5b> running on Linux x86_64 4.18.0-372.9.1.el8.x86_64 #1 SMP Tue May 10 08:57:35 EDT ...
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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:...
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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....
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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 ...
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#ASK Reverse Zone: Server Can't Find .in-addr.arpa : NXDOMAIN

I figure it out about reverse zone, so I already config my local DNS with this simple config: 1. named.conf.options acl internal { 192.168.1.0/24; // data 192.168.2.0/24; // data ...
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4 votes
3 answers
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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 ...
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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/...
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Reverse DNS not returning some values locally, but works with other online servers

Our mail server is returning mail from Charter - reverse DNS failed. If I use ping -a [IP ADDRESS] it just returns the IP address when it would normally return the domain name, and NSLookup just times ...
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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, ...
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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\"...
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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 ...
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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 ...
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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 ...
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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+...
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2 votes
1 answer
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Wireshark find DNS response "Refused"

I'm looking for a way to filter a packet capture in wireshark for instances where our server responds with "Refused" to a recursive DNS query. dns.resp.type== doesn't seem to offer anything ...
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5 votes
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How to confirm who is responsible for serving reverse DNS (PTR) requests an IP block?

Before anyone answers "ask your ISP" or "ask your hosting provider", please read in full. Scenario: I own a domain name mydomain.example, and a publically routed IP block (say 192....
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Using NGINX to Access Synology services without port numbers?

First, I apologize if this isn't the right forum as this is somewhat of a networking question. To give a brief explanation of what I want to achieve is basically have the services or apps provided by ...
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Replace VPS rDNS FQDN with a mail subdomain

I have a VPS with a single IP address and multiple domain names. I used mail-tester.com to check the spam rate of my email. And my results are: Your IP address 93.123.12.43 is associated with the ...
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DNS PTR lookup deprecated?

When I use dmarcanalyzer to check my domain I get the message: Warning : You shouldn't use PTR lookups as they are deprecated My record looks like this: v=spf1 ptr:samplemail.com ip4:191.13.174.145 ...
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iprev check for multiple ipv6 addresses

Can I add multiple PTR records mapping multiple IPV6 addresses to the same domain, and add multiple AAAA records mapping the same domain to to the same set of IPV6 addresses, to let pass the iprev ...
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How to set rDNS record for ipv6 address block?

Occasionally, I open a ticket at my VPS provider to let them create a rDNS record for me. Sometimes, I can find a page in my control panel to add the rDNS record myself. This is simple for ipv4 ...
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Domain whitelisting in Kubernetes DNS Service

Can I use Kubernetes dns service to whitelist the domains for my pods? I want to restrict the outgoing (egress) calls using Kubernetes dns service. if I can achieve this, can someone let me know the ...
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Configuring Reverse DNS for an emulated DNS server hierarchy using BIND

I'm emulating a network using Kathara (similar to Netkit) and I'm having trouble figuring out how to get reverse DNS to work across all three networks. This is the topology And this is the DNS ...
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Reverse DNS for multiple subdomains

We're setting up a system where each of our users gets their own subdomain of companymail.com for sending / receiving emails, and they can set up multiple mailboxes under that subdomain. We also want ...
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Point a Server Using Domain From Windows Server 2016 [closed]

we have a server machine with Debian 9 installed. It has an internal knowledge base website which the domain is kb.domain.com with the local IP of 192.168.1.95. Currently we have a new installed ...
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Reverse IP Lookup to Find A Records at IP Address

I want to know if there is a Linux terminal command for getting all the domains associated with an IP address. Or more correctly - find out all the sites hosted on that server IP and/or aall the A ...
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1 vote
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Reverse DNS and Apache virtual host

In short: Apache's VirtualHost doesn't work as intended when the reverse DNS is enabled. I'm managing a web service on a single CentOS server. It has a single IP address and multiple subdomains, and ...
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Google Cloud DNS explanation

I tried using Google Public DNS to Resolve DNS Records where I tried 36032b.cc.. Below is the result but can somebody explain to me the results? I can not find in the internet any guide on these ...
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Why is the reverse zone name appended to the returned domain names in reverse DNS lookup?

Not sure if I missed something when I set up the PTR records for the hostnames on FreeIPAv4. We use FreeIPAv4 to manage the identity and policy on the LAN. When I conducted the reverse DNS lookup ...
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1 vote
1 answer
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How to mitigate peacecorps.gov DOS attack on bind9 DNS Server?

I newly configured bind9 on my ubuntu server and set allow-query to { any; } as I want my DNS server to be accessible for anywhere. However, I am now facing DOS attack using peacecorps.gov domain with ...
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Dig from a specific domain shows no answer but normal dig works

I am having an issue with a WHM installation that was done over a week ago. It seems all is good on the WHM side of things but I am having issues with my nameservers I have set up Whenever I try to ...
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1 vote
1 answer
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Looking outside the internal DNS zone when using the same domain

So inside my network, we have a local DNS server (bind9). Let's say our internal zone is veridani.com, when I make local entries such as test.veridani.com it would work normally, and when I'm looking ...
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Implementing Reverse DNS in a Live Environment

I've been tasked with implementing reverse DNS internally in our Windows environment. What are some risks I should watch out for, and what is the best way to setup a test environment for changes like ...
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Cisco Umbrella Identifies DNS Request as Malicious and Looks Like it's From our Domain Controller

Our Cisco Umbrella service is identifying DNS requests to rev1.globalrootservers.net and rev2.globalrootservers.net as malicious. I am trying to figure out whether this is really a problem or if it is ...
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4 votes
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How to check for the existence of deep subdomains even if the intermediate ones don't exist?

Suppose that test.example.com don't exists and gives NXDOMAIN when runnning dig on it , but i know that subdomain.test.example.com exists and gives NOERROR when doing the same, is there a way to check ...
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Do I need a PTR (rDNS [Reverse DNS]) record if using an SMTP mail relay (Mailgun, Mailjet, Send Grid, etc.)?

My cloud hosting provider wants to charge for setting up a PTR record, which I'm not up for. As I use Mailjet as an SMTP relay server, do I even need to have it setup? Or will all my emails reverse to ...
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Reverse DNS from a cloned linode

I have cloned a linode1 that is linked to mydomain.com and the reverse DNS is li19034-215.members.linode.com; the reverse DNS of the cloned linode is also li19034-215.members.linode.com; I wouls like ...
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Using own bind name server allowing reverse dns for own mail server

I successfully created my own email server running on Ubuntu but other mail servers refuse incoming mails from my server because there is no reverse dns (PTR record). The configuration looks like own ...
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1 vote
3 answers
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Subdomain, PTR and MX Record Confusion

I am lost in DNS and rDNS (PTR) record setting for the following scenario: I have my main website example.com running in Digital Ocean at IP 192.0.2.4 In Digital Ocean control panel I have the ...
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Is it possible to make reverse dns lookup on cloudflare

Somehow Cloudflare is hiding the real ip of my server. Is there a possibility to check other domains on my ip by reverse DNS? in short I make dig some-server-name.com I got in reply some A records......
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Reverse DNS does not contain the hostname and RDNS_NONE from spam assasing

So i am trying to setup the reverse dns for my server and i got it mapping correctly to my mail domain and i did a test on mail-test but reverse dns failed with: Spam Assasin RDNS_NONE, but on mail ...
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Temporary failure in name resolution affecting most public traffic

We're having a bizarre issue with one of our domains that has been going on for the past 15+ hours at this point. The domain is not resolvable in many parts of the country. I tried pinging it on a few ...
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Reverse DNS on EC2

I'm developing a restful API as a fun challenge. For that, I've got a server running on AWS and also a custom domain registered as I would like to use it as the address for my API calls. I've been ...
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Setup apache2 000-default.conf file as catchall

I am trying to setup the 000-default.conf vhost file on my apache2 server so that if anyone points their domain name to my servers ip address but the domain has no matching vhost file the server will ...
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aws apache2 reverse dns on shared hosting server

I have a server on Amazon (Apache2/ubuntu server). I am using it to host a handful of websites. Although all the sites use gmail or other external mail providers to send and receive email I have mail ...
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How to deal with rDNS when my DNS is hosted by a third party that doesn't support PTR records?

I have NameCheap DNS for my DNS hosting and a fully unmanaged VPS server that it points to for all my domains. I'm going through and making sure everything is right and optimized, but my reverse DNS ...
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Nginx reverse dns with cloudflare

https://www.nginx.com/resources/wiki/modules/rdns/ https://github.com/flant/nginx-http-rdns How do you get the nginx-http-rdns module to work with cloudflare free DDoS protection? I wish to use this ...
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Reverse proxy for multiple paths to different paths on a single server

We have several clients who make it very difficult to launch landing pages on their websites - usually enterprise tech businesses with very strict access to their codebase and production site CMSs. ...
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2 votes
1 answer
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Reverse DNS record is not recognized

I have a problem creating a reverse DNS record. First of all, I have created a new zone. IP was aaa.bbb.ccc.ddd and Domain was ccc.bbb.aaa.in-addr.arpa. Second, I have edited the just created zone and ...
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how to modify zone file in AWS?

If a domain was purchased from a registrar A but the DNS settings for that registrar point to Amazon, where do I edit the zone file in AWS? Do I have to create a new Hosted Zone or edit a zone file ...
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