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0
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1answer
100 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
378 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 ...
0
votes
1answer
558 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
votes
1answer
219 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.
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2answers
3k 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 ...
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6answers
29k 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
156 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 ...