Questions tagged [rdns]

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Clients with broken reverse DNS are slow to connect, how to fix?

Some client has no reverse DNS and that clients has long timeout on connect with different services like ftp, ssh and more. How to configure reverse dns resolution right on production servers? Maybe ...
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1answer
833 views

Why my emails go to junk folder?

I registered a new .xyz domain name a few days ago. The domain name was never registered by others before. I set up a postfix server on a clean ip(checked its reputation). I set up SPF, DKIM, and ...
1
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1answer
31 views

What is the standard for assigning rDNS to unused hosts?

In a range with unused hosts, is the standard to set the rDNS to a generic default one within the network (such as the IP address dot the company's domain name) or is rDNS not meant to be set for an ...
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0answers
49 views

Is there an advantage to using separate IPv4 and IPv6 reverse delegation servers?

Currently, we have the following DNS servers setup for reverse DNS of IPv4 and IPv6 ranges: rdns0.v4.rdns rdns1.v4.rdns rdns2.v4.rdns rdns0.v6.rdns rdns1.v6.rdns rdns2.v6.rdns Where the v4 servers ...
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0answers
1k views

Reverse DNS setup not working - BIND on CentOS 7

I haven't setup BIND before but am quite knowledgable with DNS (I'm from the Windows world). I'm having a reverse DNS issue. Forward DNS is working fine for the zone int.linuxlab Here are the ...
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1answer
437 views

Create a fake RDNS resolution in Linux

I'm currently contributing at Mozilla Community IT, and I'm working with our infrastructure team to setup a puppet master. Puppet doesn't play nicely without RDNS resolving properly, but our cloud ...
1
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2answers
1k views

How can traceroute show two different names for the same IP address?

Here are two traceroutes both to 82.195.128.132. One results in the name ns1.hosting365.ie and the other in the name mail.hosting365.ie. Why the difference? traceroute to mail.cameracentre.ie (82.195....
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1answer
1k views

Is the reverse DNS lookup performed by IRC networks usually validated against the forward lookup?

Google gave me conflicting answers for this one. Some believed that most networks take the lazy attitude to DNS lookups and simply set your hostname to whatever RDNS throws up while others said it was ...
2
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1answer
527 views

Setting up an email server's IP address for reverse DNS lookup

Should I set my IP address' PTR record to the domain (mydomain.com) or the subdomain where the mail server is (mail.mydomain.com)? It's a little confusing.
4
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3answers
10k views

How long does reverse DNS take to propagate?

Say I have two domains, foo.com and bar.com, and I initially have an A record for: www.foo.com → 1.2.3.4 I then decide I want www.bar.com to resolve to this IP, so I delete www.foo.com's A ...
27
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7answers
97k views

How To Resolve IP Addresses To Domain Names?

I know it is possible to resolve IP addresses to host names but can IPs be resolved to domain names?
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5answers
244 views

IP address + domain name

I have an IP address, xx.xx.xx.xx, for which ping works. But when I do an nslookup for that IP address it is failing. Is there a way to find the domain name of the machine with the IP address xx.xx.xx....