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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List all DNS records for host

We have an issue with DNS in our environment where the DNS record for a computer will not get updated when it moves to a new subnet. I manage our desktops so I have no access to nor am I involved with ...
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683 views

Resolving FQDNs on Mac DNS Server from a WAN (externally)

I am quite a newbie at this, so please spare me the stick. I have the following networking topology - Comcast Business Gateway<->SonicWall TZ Router<->LAN (Mac OS X Servers). I am using my ...
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82 views

Migrated to new server, DNS setup >48 hrs, some MySQL inserts from domain still show up on old server

Title says it all - I've migrated to a new dedicated server at a different IP.. It's been more than 48 hours since DNS was setup. Some MySQL inserts (standard php variables invoke mysql) from at ...
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1answer
1k views

Mac OSX Server 10.6 DNS Issues

The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So ...
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1answer
3k views

Forwarder dns not resolving reverse lookups

I have created one new dns server in lab and its working properly. Earlier we were using another dns server for lab pc's as 10.20.30.xx. which is outside the lab premises. now issue with newly created ...
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140 views

“Bad PTR DNS Resource Record” when sending E-Mail from Shared Hosting

I have a virtual server with one IP x and have multiple sites a.com and b.com running on it. When accessing x in the browser, I get to homepage a.com. Sending an e-mail from a.com to GMX is without ...
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88 views

DNS Active Directory Zone Replication Scope (Forest vs Domain)

When I create a new Domain Controller with dcpromo then the wizard will also add a DNS Role to the server because the first domain controller must be the global catalog server for the forest. After ...
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138 views

Public domains and hosts resolving to 127.0.0.1

Our security systems are going crazy alerting us that hundreds of external DNS queries and responses are resolving to addresses like 127.0.0.1 and sometimes 0.0.0.0 to requests originating from our ...
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466 views

How to DNSSEC Sign Bind9 Reverse Zone

I'm using bind9 and dnssec-keygen/dnssec-signzone. I've had no problem signing my forward zones however I cannot seem to find any documentation on signing reverse zones. What is the process for this?
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836 views

reverse lookup not working with my own nameservers for any internet address

I have two DNS servers running. With internal addresses it is no problem to look them up both ways: user@ns1:~$ man named.conf user@ns1:~$ host vh01 vh01.example.de has address 192.168.180.4 user@ns1:~...
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30 views

DC Promo With DNS Windows 2008R2 Resulting In Weird Network Error

I am preparing for DC domain migration in which I am encounter some error that I had never encounter in my VM testing environment. Note: This is the first time I am setting up an active DC with DNS. ...
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162 views

How do I find the actual domain for an IP addresses in my web log that uses a CDN?

I'm trying to analyze our web access log to report on which organizations are accessing our website. But for many of the IP addresses in the log, the reverse DNS lookup resolves to CDN domain names ...
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1k views

Linux PCs sending “ICMP udp port unreachable” to DNS server

So digging around in my syslog I have been noticing a lot of ICMP packets being flagged by our ASAs: %ASA-4-313005: No matching connection for ICMP error message: icmp src Internet:x.x.21.122 dst ...
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150 views

Reverse DNS query of public IP returns localhost

I'm seeing this unusual behavior with reverse DNS lookups on this public IP Address: 222.253.228.79. Can someone explain what's going on? MXToolbox PTR lookup resolved localhost as the domain ...
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70 views

Syslog-ng reverse dns lookup for data fields

I would like to try a reverse-dns before storing the firewall logs. I know this is possibile in logstash but i don't know if syslog-ng can be configured to do the same. Actually my logs coming from ...
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1answer
347 views

AWS DNS Error - SERVFAIL

So I have followed the configuration guide provided by Amazon (http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/CreatingNewDNS.html), but I cannot get the URL/Domain to be send out to the name ...
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1answer
105 views

Deleting reverse zone in windows 2003 DNS server

This is my first time posting here on server fault. The problem i am faced with is when i try to add another DC to my network i am getting a very weird error. After some countless hours and re-reading ...
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1answer
211 views

Dns filezone setup with mx and spf

I am trying to create a mail server. I bought the domain mastermails.info on godaddy.com. I am struggling with the setup of DNS. Whenever I change something in the MX record to make my server ...
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427 views

Some E-mails are being rejected, do I need a DNS record for my default gateway?

I have been seeing more of these types of bounceback messages (IP address changed for example): mail.test.com #550-Your message was rejected by this user and was not delivered. 550-Reason: Your ...
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196 views

rDNS setup to prevent emails appearing as spam / phishing messages

We are trying to send email without the email appearing in the spam folder. The emails that we are sending is solicited bulk email. The main problem is that the emails are appearing as phishing ...
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1answer
132 views

DNS setup: server1-> CNAME to server2 -> IP address without website being visible on server2

I've been trying to figure this out for a while. I've been googling but I couldn't really figure it out. I have bunch of VPS's for my clients. Each has its own IP address, with a single website on it,...
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395 views

RNDC: Connection Refused

Just got myself a new VPS, not the first I can assure you. Upon adding any DNS entry, I am prompted with this: WARNING: key file (/etc/rndc.key) exists, but using default configuration file (/etc/...
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236 views

rDNS mx record problem, smtp test fails

down vote favorite I am doing test at mxtoolbox.com ptr: ip -> mydomain.com mx: mydomain.com ->myip but smtp:173.231.15.144 -> OK - myip resolves to myip.hosted.static.hostingfirm.com / Warning - ...
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86 views

Just set up my rDNS entry. Want to make sure I've done everything that's required

I've setup one of my domains to point to my Linode IP address: server.mydomain.net > 1.1.1.1 I then went into my Linode DNS manager and set the rDNS entry to the above URI. I then set my ...
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543 views

Failed reverse DNS and SPF only when using Thunderbird!

I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address ...
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FCrDNS for a mail server that also runs other services (http, ftp etc)

I am learning how to administer productive internet-facing machines and services, and towards that end setting up mail, web, and a couple other services, all on the same box (budget constraints and ...
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114 views

exim4 mail relay for multiple domains

I have hMailServer running on a Windows 2012 box and exim4 running on a separate box. However, I would like to continue configuring my email accounts on the Windows server (via hMailServer), but relay ...
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65 views

Why does my box keep sending reverse DNS queries and how to stop it?

Situation My box keeps sending reverse DNS queries about our LAN hosts. Obviously they all fail because they are private addresses. Request Source: 192.168.1.6 Destination: 192.168.1.1 (default ...
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474 views

Postfix on server with multiple IP addresses sends mails with wrong HELO in header

I have a VPS with multiple IP addresses: venet0:0 x.x.x.2 venet0:1 x.x.x.3 venet0:2 x.x.x.4 venet0:3 x.x.x.5 All IPs have A records m2.domain.com -> x.x.x.2 m3.domain.com -> x.x.x.3 m4.domain....
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332 views

How do I restrict the domain name for reverse DNS updates with bind and nsupdate?

I've set up Bind to allow hosts to update only their own DNS entries, but I'm having trouble with the reverse DNS portion of this. My configuration is as follows: named.conf options { listen-on ...
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138 views

How to breakout Reverse DNS Zones

I've inherited a Windows network with Windows server based DNS and there are issues, such as not being able to update PTR records, etc. So, I am at a branch office with our own AD domain and DNS on ...
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40 views

hostname is not working in HTTP, but IP is Working fine

I have a lab setup with 2 DNS and 2 DC with 10 other machines. i have assigned every machine in static IP. its all in 10.77.205.0/24 network.. i can access the machines application via http by using ...
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42 views

ipv6 rDNS with bind

Maybe I just can't wrap my head around ipv6 yet but I'm having trouble returning DNS entries for rDNS. Considering the ipv4 scheme, the following is what I'm aiming for: internal.example.com should ...
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85 views

Curl Error Connection timed out

I have a website (www.example.com | 123.456.789), in that machine i only have 1 web app running. i am trying to use php file_get_content() to a file which in my own server (located on some file like /...
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69 views

dnsmasq classless reverse forwarding

I'm currently using a dnsmasq as DNS forwarder for a handful of classless zones and the A record forward is working fine. But I now do have some trouble with the PTR query forwarding, since I don't ...
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34 views

Mailserver complains about reverse DNS lookup on my Gateway

I am presented a mail server setup, that is working well. There's only a small issue, which makes me think, there's something wrong in the DNS setup. It is a small setup with a Debian mail server (...
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296 views

Centos-bind: Reverse DNS failed

Hi Server fault member, I need to setup a reverse DNS for my client. There have 3 IP ranges on the rDNS server. The server system is Centos 6.5 with bind 9 Let me describe my situation. I have a ...
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155 views

Captive portal and walled internet

I am creating a tour guide app which visitors can download when they arrive on location. There will be a Hotspot to which they connect, they will get a welcome page with instruction (and a button to ...
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385 views

PowerDNS Reverse lookup is not responding in VPN connected network

I created a test network. It is a star VPN network with: - 1 main router - 2 subrouters (DrayTek Vigor 2920) - behind each router a client - behind the main router a PowerDNS machine now the ...