All Questions
Tagged with domain-name-system reverse-dns
294
questions
0
votes
2
answers
277
views
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 ...
0
votes
1
answer
166
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 ...
- 191
0
votes
1
answer
374
views
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 ...
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 ...
- 208
0
votes
2
answers
90
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 ...
- 91
0
votes
1
answer
80
views
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..."...
- 101
0
votes
1
answer
244
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....
- 3
2
votes
0
answers
152
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?
- 133
-1
votes
1
answer
669
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....
- 519
0
votes
0
answers
2k
views
#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
...
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+...
- 111
2
votes
1
answer
1k
views
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 ...
- 1,035
5
votes
2
answers
1k
views
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....
- 327
0
votes
0
answers
759
views
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 ...
- 267
1
vote
0
answers
423
views
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 ...
- 265
0
votes
1
answer
1k
views
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 ...
- 113
-2
votes
1
answer
309
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 ...
- 101
1
vote
2
answers
2k
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 ...
- 111
0
votes
1
answer
379
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 ...
- 15
1
vote
1
answer
2k
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 ...
- 111
0
votes
1
answer
1k
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
1
answer
324
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 ...
- 23
0
votes
1
answer
616
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 ...
- 29
4
votes
2
answers
1k
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
0
answers
855
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 ...
- 189
0
votes
1
answer
100
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 ...
1
vote
3
answers
823
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 ...
- 11
0
votes
1
answer
725
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 ...
- 184
0
votes
1
answer
813
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 ...
- 107
0
votes
1
answer
61
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 ...
- 111
0
votes
0
answers
529
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 ...
- 179
0
votes
0
answers
579
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/...
- 109
0
votes
2
answers
2k
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:
...
- 105
0
votes
1
answer
89
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 ...
- 3
0
votes
1
answer
1k
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 ...
- 123
0
votes
1
answer
398
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-...
- 63
0
votes
1
answer
671
views
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....
0
votes
1
answer
5k
views
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 ...
- 251
0
votes
2
answers
943
views
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 ...
- 103
0
votes
3
answers
760
views
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 ....
- 17
-1
votes
1
answer
135
views
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 ...
- 1
22
votes
1
answer
6k
views
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 ...
- 333
0
votes
1
answer
81
views
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 ...
- 101
-5
votes
2
answers
637
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. ...
- 101
0
votes
0
answers
39
views
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 ...
- 1
-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?
- 1
1
vote
1
answer
3k
views
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 ...
- 131
0
votes
2
answers
314
views
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.....
- 1
0
votes
0
answers
1k
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) ...
- 49k
1
vote
1
answer
384
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....
- 113