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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delegating /24 and /64 reverse zones

I'm sure I'm overlooking something so simple, but I'm just not seeing it... I'm trying to delegate the /24 and /64 reverse zones for our Test network to hosts within the Test network. I'm seeing the ...
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84 views

Exchange 2007: relay only from selected servers based on rDNS

I'm looking for a way to make Exchange 2007 only accept mail from a certain group of hosts. These hosts all use the same identifying rDNS entry. Exchange 2003 uses a whitelist based on the reverse ...
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532 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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79 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
982 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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586 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

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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629 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 ...
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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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91 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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432 views

Azure public/private dns resolution

Does anybody know if Azure has the same capability as AWS to resolve an external DNS hostname to the public IP address of the instance outside the network of the instance, and to the private IP ...
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219 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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131 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
113 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 ...
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282 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 ...
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216 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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359 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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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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One vps 2 ips 2 domains

So like the title suggest I have 1 VPS, 2 IPs, and 2 domains. It has been a constant uphill battle trying to keep things separate so before I continue I would like to ask is it even possible? So as ...
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96 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 ...
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Priorities or ambiguos DNS reverse zone with Bind

In my internal DNS running on Bind9 all machines are available at up to 3 different domain names, i.e. all machines are listed as machine.legacy.domain and machine.new.domain. Some machines are joined ...
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43 views

Remove Port Access Using mod_rewrite or Something Else

Server Info: Apache VPS, WHM/cPanel, CentOS I am using a CDN/reverse proxy (Cloudflare) to obscure the true IP of my server. So I intend to access WHM/cPanel using the direct IP like this: ...
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151 views

Cisco DNS Inspection disallows Reverse Lookup

I'm trying to use DNS Doctoring on my ASA 5505, but apparenly DNS Doctoring required DNS Inspection, and DNS Inspection forbids reverse lookup requests?! How do work around this? I did find this: ...
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335 views

Mysql remote connections very slow - host lookups already disabled

I followed every instruction about this issue and nothing helped. Remote communication with MySQL server takes 4-30 seconds on simple query like select 1 from table_name and connection attempt often ...
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95 views

The email sent from my server are marked as spam

I have a dedicated server at OVH. For several days I've noticed I'm in a spam list (spamcannibal). The reason I said was for generic PTR. I've changed and I have commanded to remove from the list. ...