DNS Problem

[Iain West]

Hi all,

I have set up my Internal DNS to resolve all internal host names and I have
this forwarding to my ISP's DNS's servers,

I could ping external IP address's without problem until I setup the reverse
lookup zone. After this I could not ping external addresses, but I can ping
all three of my ISP's DNS Server's.

Can anybody shed any light on how I may of misconfigured by reverse lookup
zones.

TIA

 

[Iain West]

"Iain West"

Hi all,

I have set up my Internal DNS to resolve all internal host names and I have
this forwarding to my ISP's DNS's servers,

I could ping external IP address's without problem until I setup the reverse
lookup zone. After this I could not ping external addresses, but I can ping
all three of my ISP's DNS Server's.

Can anybody shed any light on how I may of misconfigured by reverse lookup
zones.

TIA

OK,

Some more info.

I have just randomly tried a few more external IP Addresses and some work
and some don't.

I can't ping intel.com or microsoft.com but I can perform a NSLookup (ablit
slowly, DNS timesout) and get there IP address and then can't ping either IP
address or host name.

I can't ping or perform a lookup on cofunds.co.uk but there site it working.

Then I can ping and perform a lookup on samspade.org.

Is this a problem with my root hints or even does the issue lie with my
ISP's DNS Servers??

TIA

 

[Ace Fekay [MVP]]

In

Hi all,

I have set up my Internal DNS to resolve all internal host names and
I have this forwarding to my ISP's DNS's servers,

I could ping external IP address's without problem until I setup the
reverse lookup zone. After this I could not ping external addresses,
but I can ping all three of my ISP's DNS Server's.

Can anybody shed any light on how I may of misconfigured by reverse
lookup zones.

TIA

Can you give us an example of what is happening?

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS IS" with no warranties.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

 

[Kevin D. Goodknecht [MVP]]

In Iain West <[email protected]>
posted a question
Then Kevin replied below:

"Iain West"


OK,

Some more info.

I have just randomly tried a few more external IP Addresses and some
work and some don't.

I can't ping intel.com or microsoft.com but I can perform a NSLookup
(ablit slowly, DNS timesout) and get there IP address and then can't
ping either IP address or host name.

I can't ping or perform a lookup on cofunds.co.uk but there site it
working.

Then I can ping and perform a lookup on samspade.org.

Is this a problem with my root hints or even does the issue lie with
my ISP's DNS Servers??

TIA

What is the name of your reverse lookup zone?
Intel.com and microsoft.com are NOT pingable.

 

[Iain West]

In Iain West

posted a question
Then Kevin replied below:

What is the name of your reverse lookup zone?
Intel.com and microsoft.com are NOT pingable.

The reverse lookup is 192.168.31.0 subnet

I used to be able to ping intel.com

 

[Kevin D. Goodknecht [MVP]]

In Iain West <[email protected]>
posted a question
Then Kevin replied below:

The reverse lookup is 192.168.31.0 subnet

I used to be able to ping intel.com

Just verifying the zone name is NOT 192.in-addr.arpa that would conflict
with public name servers. 168.192.in-addr.arpa is OK

Well, I cannot ping intel.com which resolves to 198.175.96.33 which BTW does
not have a reverse lookup, a reverse lookup on that IP causes a loop.

 

[Iain West]

In Iain West

posted a question
Then Kevin replied below:
Just verifying the zone name is NOT 192.in-addr.arpa that would conflict
with public name servers. 168.192.in-addr.arpa is OK

Well, I cannot ping intel.com which resolves to 198.175.96.33 which BTW does
not have a reverse lookup, a reverse lookup on that IP causes a loop.

OK, I understand zone name's now, it is called 31.168.192.in-addr-arpa.dns.

OK, I happy now as I can ping other site's like yahoo.com and google.com,
which I couldn't do before.

Thanks