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.

Filter by
Sorted by
Tagged with
-1
votes
0answers
19 views

Office 365 to Gmail - reverse DNS (PTR) lookup

This questions is related to Reverse DNS the reason my Mails are rejected?, but it wasn't answered in today's more "modern" context as described in the quote from Microsoft below. When ...
-1
votes
0answers
26 views

Facing issue while configuring reverse DNS with VM Public IP

We are trying to follow Microsoft documents to set reverse DNS on a VM Public IP but receiving below error: Set-AzPublicIpAddress: ReverseFqdn smtp01.example.co that PublicIPAddress is trying to use ...
-2
votes
1answer
35 views

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 ...
1
vote
2answers
54 views

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 ...
1
vote
0answers
36 views

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 ...
0
votes
1answer
23 views

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 ...
0
votes
1answer
33 views

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 ...
0
votes
1answer
70 views

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 ...
0
votes
0answers
15 views

getnameinfo 5 second stall for link local IPv6 addresses on macOS 11.2

Resolving a link local IPv6 address, e.g. "fe80:0:0:0:1df5:94d:4c6c:6b43" using the getnameinfo function on macOS 11.2 (Big Sur) results in a 5 second wait. I used this C code to check: ...
0
votes
1answer
88 views

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 ...
1
vote
1answer
42 views

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 ...
0
votes
1answer
30 views

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 ...
0
votes
1answer
163 views

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 ...
3
votes
2answers
583 views

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 ...
0
votes
0answers
67 views

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 ...
0
votes
1answer
53 views

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 ...
0
votes
1answer
87 views

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 ...
1
vote
3answers
188 views

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 ...
-1
votes
2answers
301 views

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......
0
votes
0answers
93 views

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 ...
0
votes
0answers
17 views

Can a reverse zone be nested inside another reverse zone?

Say I have a DNS server with a reverse zone as follows: 168.192.in-addr.arpa Can I create an independent DNS server with the following reverse zone, and have both work correctly: 100.168.192.in-addr....
0
votes
1answer
149 views

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 ...
0
votes
1answer
66 views

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 ...
0
votes
0answers
15 views

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 ...
0
votes
0answers
26 views

How to let users mask domain for whit label?

We provide white label services to the users, where users can use our app on their domain by masking our sub-domain by cnaming to app.domain.com. I want the user to mask the subdomain (app.domain.com)....
0
votes
1answer
237 views

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 ...
0
votes
1answer
55 views

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 ...
0
votes
1answer
162 views

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 ...
0
votes
1answer
18 views

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. ...
2
votes
1answer
102 views

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 ...
0
votes
0answers
47 views

Reverse DNS fails with mail server using a DNS Proxy

I've got an email server setup and working pretty well. It's also using a DNS Proxy (correct term?) service (in this case, Cloudflare Managed DNS). So, the IP address of the actual server sending the ...
0
votes
1answer
33 views

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 ...
0
votes
2answers
154 views

Running your own email-server for multiple domains on single IP

I'm doing a little research on how you can run your own e-mail server for your domain. I know that you can use Zoho, or gmail, or any other alternative. However, I'm wondering if it's possible to do ...
0
votes
0answers
77 views

Can't connect to public cloud server via http/https in OVH

I'm new to OVH and trying to setup a site inside a public cloud server. I've got the server up and running and i can SSH into it, but can't get to port 80. (server has apache running and it can be ...
0
votes
1answer
163 views

Correct DKIM, Reverse DNS configuration to send from 2 different domains?

I have set up Postfix on an Ubuntu 18.04, with a view to sending emails from two different domains, which I will refer to here as abc.com and xyz.com. I'm trying to configure everything so that emails ...
2
votes
1answer
55 views

Derive IP Address of DNSNode record in Reverse Lookup Zone using LDAP query

Wanted to ask a question: How is it possible to derive IP address from querying a DNS Node in Reverse Lookup Zone with LDAP? To be more precise, I want to show you what I've been trying to achieve: ...
0
votes
0answers
93 views

Configure Reverse DNS in Primary and Secondary BIND DNS Servers for same subnet

I have two DNS Servers (Let's say A and B). A configured as the primary/master for the domain example.com and B configured as the secondary/slave for the same domain. B configured as the primary/...
0
votes
1answer
286 views

Reverse DNS PTR record

I have a dedicated server (Ubuntu 18.04 with virtualmin & webmin) which is hosting 7 WordPress sites on it. I have set up MX, DMARC, SPF and DKIM records for each one of them but dns tests online ...
0
votes
2answers
424 views

MX record in a reverse zone

I am taking a DNS course on Linux Academy. In one of the lab, they define a reverse zone. In this zone they add MXs records. Does it make sense to have MX record defined in a reverse zone? Details: ...
0
votes
0answers
22 views

Windows DNS - Reverse Zone - allow zone transfer - Access denied

Anyone know why a DNSAdmin would get access denied when trying to enable a zone transfer for a specific reverse DNS zone? They have full control on the zone, but when attempting to enable zone ...
0
votes
1answer
43 views

How websites discover subdomains using only 'A' DNS records [closed]

Don't 'A' records only return IPv4 addresses? Why do some websites return subdomains? How do they find those subdomains? I mean, are they doing normal subdomain bruteforcing then resolve each ...
0
votes
2answers
676 views

How to solve reverse DNS lookup error when mail.example.com is stored on server.example.com

Environment: Digital Ocean, Centos 8, Postfix/Dovecot Background: For my droplet I used a FQDN, server.example.com. Digital Ocean configures the PTR record (reverse DNS entry) on their end based on ...
0
votes
1answer
374 views

DNS Forward Lookup is Failing in Linux

I am installing a two node RAC on my testbed (virtualbox), i have setup the DNS server, forward lookup is not working but reverse lookup is, PFB [root@dbwr1 log]# nslookup dbwr1.localdomain Server: ...
0
votes
2answers
192 views

How does reverse DNS add security? [duplicate]

There are plenty of good answers here about how reverse DNS works, but why is it used? It seems that all reverse DNS proves is that the person sending the email has access to the DNS records for the ...
0
votes
1answer
101 views

| rDNS | IP gets resolved with a wrong hostname

I've been trying to set up rDNS so my IP could get resolved to my hostname in a program which has a built in rDNS lookup feature. I had done everything I was suggested (ask my ISP to make a PTR record ...
0
votes
0answers
62 views

nginx proxy_pass only when rdns resolves correctly

I have a nginx server on PC_A running as a proxy for a website hosted on PC_B. The server on PC_A provides rate limiting, buffer and cache services for the website. I would like to enable DNS lookup ...
0
votes
1answer
84 views

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 ...
3
votes
4answers
704 views

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 (...
0
votes
1answer
233 views

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 ...
0
votes
1answer
114 views

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-...

1
2 3 4 5
11