rDNS and Linux

[WanMan]

I have a customer running a linux virtual hosting server
at my colocation facility. They have 5 IP addresses that
they use. They need to be able to do their own reverse
DNS. My DNS servers are authoritative for the entire
class of IP addresses. I would simply like to know how to
refer reverse DNS queries to their linux dns server
instead of my Microsoft DNS server.

Thanks,
Mike

 

[Kevin D. Goodknecht [MVP]]

In

I have a customer running a linux virtual hosting server
at my colocation facility. They have 5 IP addresses that
they use. They need to be able to do their own reverse
DNS. My DNS servers are authoritative for the entire
class of IP addresses. I would simply like to know how to
refer reverse DNS queries to their linux dns server
instead of my Microsoft DNS server.

Thanks,
Mike

You have to delegate the IPs to their DNS using a CNAME for their reverse
lookup zone.
It sounds more difficult then it really is but when configured right is
works good.
HOWTO: Configure a Subnetted Reverse Lookup Zone on Windows NT
http://support.microsoft.com/default.aspx?scid=kb;en-us;174419&FR=1

 

[Kenneth Porter]

You have to delegate the IPs to their DNS using a CNAME for their reverse
lookup zone.
It sounds more difficult then it really is but when configured right is
works good.
HOWTO: Configure a Subnetted Reverse Lookup Zone on Windows NT
http://support.microsoft.com/default.aspx?scid=kb;en-us;174419&FR=1

Ugh. That seems to imply that one must tediously enter each CNAME record,
one by one. Does that mean Win2k doesn't understand the $GENERATE syntax
commonly used for this in BIND environments?

 

[Kevin D. Goodknecht [MVP]]

In

Ugh. That seems to imply that one must tediously enter each CNAME
record, one by one. Does that mean Win2k doesn't understand the
$GENERATE syntax commonly used for this in BIND environments?

I'm not sure about that, he only has five IPs to delegate so it really won't
take very long. If it was a hundred I would have to step back and see if
there were another way.

 

[Jonathan de Boyne Pollard]

W> I would simply like to know how to refer reverse DNS
W> queries to their linux dns server instead of my
W> Microsoft DNS server.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/avoid-rfc-2317-delegation.html>

 

[Jonathan de Boyne Pollard]

KP> That seems to imply that one must tediously enter each
KP> CNAME record, one by one.

Correct. Of course, there's no need for those client-side aliases at all,
so one need not be entering "CNAME" resource records.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/avoid-rfc-2317-delegation.html>

Moreover, one can always employ DNSCMD in a script.

KP> Does that mean Win2k doesn't understand the $GENERATE syntax
KP> commonly used for this in BIND environments?

As far as I am aware, it does not.

$GENERATE and several other directives are specific to ISC's BIND. They are
not mentioned in the DNS standards (which really shouldn't be dealing with
internal server matters such as database source file formats in the first
place, of course). To use them is to lock onesself into one company's DNS
server software.

 

[Kenneth Porter]

KP> That seems to imply that one must tediously enter each
KP> CNAME record, one by one.

Correct. Of course, there's no need for those client-side aliases at
all, so one need not be entering "CNAME" resource records.

<URL:http://homepages.tesco.net./~J.deBoynePollard/FGA/avoid-rfc-2317-de
legation.html>
Slick.

Moreover, one can always employ DNSCMD in a script.

Good point. I'm used to using netsh for DHCP, but haven't yet had an
opportunity or need to script DNS stuff. (But I'm sure it will come up.)