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Old 09-19-2007, 10:21 PM   #1
Registered: Apr 2005
Distribution: Red Hat / Fedora / CentOS
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Reverse DNS: Why is the record on the datacenter DNS server instead?

Hi guys, just a simple DNS question...

for most set of DNS records.. we usually insert the record into our own DNS server, in the appropriate zone file. Recently I had a need for a PTR record, which had to be inserted in the zone file of our datacenter's DNS server...

why so? I thought I would have to put all the relevant entries in the same zone file for one domain?
Old 09-20-2007, 02:27 AM   #2
Registered: Sep 2004
Location: Malaysia, Johor
Distribution: Dual boot MacOS X/Ubuntu 9.10
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there is 2 kind of dns zone, forward and reverse.

Normally in our live we use forward lookup, means inside a zone we will map www -> ip1, smtp ->ip2, pop3 -> ip3 and etc. All host name map to particular ipaddress via 'A' record.

PTR use for reverse lookup zone, allow us to map ip address to difference host. the pattern can be 0.168.192, then 1-> www , 2-> smtp, 3->pop3. The map ing between last octet of ipaddress is using PTR.

So, the same zone in reverse lookup actually is same subnet.
Old 09-20-2007, 04:42 AM   #3
Registered: Apr 2005
Distribution: Red Hat / Fedora / CentOS
Posts: 508

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ahh so that is in turn manage by the datacenter.. in the "same direction" as being in reverse? --> if that make any sense ...


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