cross dns lookup

  • Thread starter Thread starter Mr Major Thorburn
  • Start date Start date
M

Mr Major Thorburn

We have 2 domains setup. domain1.co.uk and domain2.com
both are windows 2000 active directory with integrated DNS.
on domain-controllerb in domain2.com I ping computer1 and
it resolves the address as computer1.domain2.com
IP=10.0.4.3
on domain-controllera in domain1.co.uk I ping computer1
and it resolves it as computer1.co.uk IP=195.123.23.1
If I ping computer1.domain2.com it resolves it as
IP=10.0.4.3
There is a static WINS address in domain1.co.uk for
computer1 as IP=10.0.4.3

Why does it go out to the Internet to resolve
computer1.co.uk?

Please help if your can.
 
In
Mr Major Thorburn said:
We have 2 domains setup. domain1.co.uk and domain2.com
both are windows 2000 active directory with integrated DNS.
on domain-controllerb in domain2.com I ping computer1 and
it resolves the address as computer1.domain2.com
IP=10.0.4.3
on domain-controllera in domain1.co.uk I ping computer1
and it resolves it as computer1.co.uk IP=195.123.23.1
If I ping computer1.domain2.com it resolves it as
IP=10.0.4.3
There is a static WINS address in domain1.co.uk for
computer1 as IP=10.0.4.3

Why does it go out to the Internet to resolve
computer1.co.uk?

Please help if your can.
Click to expand...

Because the DNS server it is pointing to is forwarding the request to the
internet DNS servers for it to resolve the name to the internal address the
DNS server it points to will need a forward lookup zone for domain1.co.uk.
You can do it by pulling a secondary from the DNS server with domain1.co.uk.
Or the other alternative is create a forward lookup zone on the domain2.com
DNS server with the name domain1.co.uk, then in that zone put one "wildcard"
delegation in it with the name "*" without the quotes then point the
delegation to the domain1.co.uk DNS server.
I hope I have not confused you, if you need clarification let me know.
 
In
Mr Major Thorburn said:
Sorry I forgot to mention the following:
I have set up a secondary DNS on each for eachother.
I have set forwarder from domain2.com to dns of
domain1.co.uk
domain1.co.uk has no forwarders.
I have made each WINS replica partners of the other

I thought that it would look up locally before using
forwarders or even its gateway which goes to the Internet.
Click to expand...
If you have a secondary for each name in DNS then it should not forward to
the internet for either of these domains unless it is forwarding due to
appending the DNS suffix, can you post an ipconfig /all unedited? I would
like to see what the DNS search list contains.
 
H:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : SWIFT
Primary DNS Suffix . . . . . . . :
internal.maverickenergy.co.uk
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . :
internal.maverickenergy.co.uk

maverickenergy.co.uk
co.uk

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com 3C996B
Gigabit Server NIC
Physical Address. . . . . . . . . : 00-0A-5E-00-FE-
84
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.0.13
Subnet Mask . . . . . . . . . . . : 255.255.248.0
Default Gateway . . . . . . . . . : 10.0.0.254
DNS Servers . . . . . . . . . . . : 10.0.0.13
Primary WINS Server . . . . . . . : 10.0.0.13

PPP adapter RAS Server (Dial In) Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP)
Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-
00
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.0.149
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 127.0.0.1
 
In
Mr Major Thorburn said:
H:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : SWIFT
Primary DNS Suffix . . . . . . . :
internal.maverickenergy.co.uk
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . :
internal.maverickenergy.co.uk
Click to expand...
maverickenergy.co.uk<--If you don't have a local zone for this one remove it
co.uk<--Remove this it is probably
the culprit
Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 3Com 3C996B
Gigabit Server NIC
Physical Address. . . . . . . . . : 00-0A-5E-00-FE-
84
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.0.13
Subnet Mask . . . . . . . . . . . : 255.255.248.0
Default Gateway . . . . . . . . . : 10.0.0.254
DNS Servers . . . . . . . . . . . : 10.0.0.13
Primary WINS Server . . . . . . . : 10.0.0.13

PPP adapter RAS Server (Dial In) Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : WAN (PPP/SLIP)
Interface
Physical Address. . . . . . . . . : 00-53-45-00-00-
00
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 10.0.0.149
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 127.0.0.1<--You need to
Click to expand...
reconfigure this interface this loopback address will cause registration
errors.it should be the actual private IP that DNS is listening on, which
should only be the address of the private interface not "All IP addresses"
If you select all IP addresses there will be a host created for this
interface address.
 
That DC is also running RAS. I have not been able to find
the setting to change on that server. I have looked the
the RAS setup and cannot see any reference to DNS servers.
I have found the interface 10.0.0.149 in the IP Routing
General section.
Any idea where I can change the setting?
Regards, Major.
 
In
Mr Major Thorburn said:
That DC is also running RAS. I have not been able to find
the setting to change on that server. I have looked the
the RAS setup and cannot see any reference to DNS servers.
I have found the interface 10.0.0.149 in the IP Routing
General section.
Any idea where I can change the setting?
Regards, Major.
Click to expand...
Though I have never done this myself, several posters have fixed it by
disabling and reconfiguring the RAS interface.
 
OK thanks for your help.
I will have a go at reconfiguring it.
Regards, Major.
 
The DNS suffix search order is causing this. Add a DNS suffix for domain2.com to the server and it should be able to find
domain2.com if DNS is setup properly.

Thank you,
Mike Johnston
Microsoft Network Support
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