Linked Questions

2
votes
1answer
1k views

Is having the same PTR hostname valid for multiple ip addresses? [duplicate]

Currently I have the following setup with two hostnames and two ips: cheeze1.mydomain.com IN A 123.123.123.111 111.123.123.123.in-addr.arpa IN PTR cheeze1.mydomain.com cheeze2.mydomain.com ...
32
votes
6answers
48k views

Multiple Reverse DNS Entries?

I'm a DNS noob, so here's a question: Can a server have multiple reverse DNS entries? Or does one IP address just resolve to one DNS name? Here is why I need this: I have a number of sites hosted ...
25
votes
1answer
4k views

Do internet standards require reverse DNS for every device?

The requirements surrounding reverse DNS are confusing! People frequently talk about everything breaking if reverse DNS is not present, and that sounds scary. Even in cases where applications don't ...
8
votes
3answers
16k views

Is it bad to have the reverse DNS for two IPs point to the same domain name?

I am in the process of setting up a new server for my web application (the site will be moved, it is not for load balancing or the like), which has a different IP address from my existing server. My ...
3
votes
4answers
14k views

Reverse DNS Setup for an IP with multiple domains

I am trying to clarify my Reverse DNS PTR lookup for a domain. I have a server with a single IP addresses and multiple accounts, all sharing that IP address; My PTR is currently: 24.210.31.in-addr....
1
vote
1answer
240 views

Correct Syntax for a SPF record

I want to create a SPF record for multiple subdomains, but I have no clue how to write a correct syntax. Since I am writing an application and it is not yet running live so I cannot yet test it. But ...
1
vote
1answer
100 views

Is it ever preferable to have a server without a DNS PTR record? [closed]

Other questions on this site explain why it's helpful to have a PTR record, and why it's unhelpful to have multiple of them. Are there any real-world situations where a server with one or more A ...
0
votes
1answer
112 views

Reverse DNS PTR records for a single domain sending from multiple IPs

In our company we host our own exchange mail server, and this sends mails from our internal IP. The DNS PTR record is configured for this and everything gets delivered. We also have some web ...
2
votes
1answer
67 views

BIND DNS lookup shows a wrong IP for the domain name

I have a BIND DNS server in a LAN with hostname --short : server hostname --domain : unisof.com hostname --fqdn : server.unisof.com hostname --ip-address : 192.168.1.100 /etc/bind/named.conf....
1
vote
1answer
38 views

bind strange behavior with ping

I've BIND on my lan and I created a zone: $ORIGIN example.com. $TTL 604800 ; 1 week @ IN SOA ns1.example.com. max.example.com. ( 2017103151 ; serial 604800 ;...