a bit of theory about PTR records requested

Gregg Rosenberg gregg at ricis.com
Wed Mar 29 13:44:55 UTC 2000

Sorry, I think I sent this in HTML last time, here is the plain text.

With the address range you are showing, I will assume that we are looking 
at an internal DNS for address space behind your firewall.  There are 
slight performance advantages to setting up reverses.  If your users are 
not connecting to any services on the inside that require reverse 
authentication it likely does not matter.  I personally consider it a good 
practice to do.  Depending on your environment there are different ways to 
approach this.  If you are running a DHCP server with statically assigned 
leases, you can dump your DHCP table into Excel (or some other favorite 
spreadsheet tool) and use a macro to make the reverse file.  You could 
write a script to convert your forward into a reverse and run it each time 
you make a change.  (one may exist on the net, although I don't personally 
no of it.  The other option might be to consider using dynamic DNS with 
DHCP.  This is still a bit new and likely will require patience and 
testing.  I hope these ideas are helpful.

At 03:33 AM 03/29/2000, Martijn van Katwijk wrote:
>I also have zones like this:
>domain.com.     IN      A
>www             IN      CNAME   domain.com.
>In fact I have quite a lot of these, all pointing to a single virtual name 
>based webserver with only a few IP nrs assigned to it.
>So I have a lot of A records to a single IP nr.
>Do I have to configure a PTR for each A record? Or is that meaningless.

Gregg Rosenberg -- N9NNO
gregg at ricis.com

"Obstacles are those frightful things you see when you
take your eyes off your goals."  Author unknown

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