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DNS problem

Hello, i have a Win2003 SBS as the only server.

From some of the PC's i can reach http://companyweb just fine. But some PC's just reach the same wrong dutch website.

I tried restarting the DNS service on the server, testet with one of the faulty PC's, and done, i could reach companyweb.. The day after, the problem was back..

Any ideas? The servers network settings is set to use itself as only DNS server.
Let me know if i need to specify more details.


Thanks in advance
Carsten Dahl
Denmark.
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NetSarC
Asked:
NetSarC
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1 Solution
 
SaineolaiCommented:
Are the dns servers on the "faulty" pcs assigned via DHCP?  Can you confirm that only internal DNS servers are assigned to those PCs?

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NetSarCAuthor Commented:
Everything is supplied thrugh dhcp.

My network is 192.168.1.0
Win2003 SBS server 192.168.1.10

Gateway/router/DHCP server is 192.168.1.1
DHCP range is 192.168.1.50 - 192.168.1.100

DNS servers supplied thrugh DHCP is:
1. 192.168.1.10
2. MY ISPs Primary
3. MY ISPs Secondary

I should say, i have tried to set a static IP/DNS on a faulty PC, so i could avoid my ISP's DNS servers easily.. That didn't do anything, but when i changed it back to dhcp, it i could reach http://companyweb .. The day or so after, the problem was back again.
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SaineolaiCommented:
On a machine that is displaying the external website can you enter these commands...

ipconfig /displaydns

This should display an entry for the companyweb host.  Can you confirm that the full name of the host is correct?

Then enter

ipconfig /flushdns

This empties the dns cache on that PC

Then try access the website, if it works this time.  Re-enter the first command and compare the output.
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ZadkinCommented:
It is strange as I get only the SBS server as DNS server through DHCP and no number two and three,  so I don't expect this is a standard configuration.  Can you show  the full ipconfig /all of server and workstation,  maybe also the situation when things go wrong.
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NetSarCAuthor Commented:
I have tried the ipconfig /flushdns and then retried to connect.. That didn't help anything, still wrong website..

The problem exists also with other websites .. Eks. did a search on google for some random stuff, clicked a link, and then i was sent to the same odd dutch cd selling site...

I'll have to get back to you on ipconfig /displaydns if you think it's nessesary..
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NetSarCAuthor Commented:
Zadkin, if you re-read my post about IP settings, you would notice that the SBS server is not the DHCP server. My router has that function.
The reason for supplying my ISP's DNS server is, if the SBS server is down, the client PC's can atleast reach the internet (www etc..)
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NetSarCAuthor Commented:
Anyway, i have tried setting static IP and leave out my ISP's DNS.. Didn't work.. Just now, im remembering that i didn't flush the DNS that time tho'... Maybe i should try that..
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ZadkinCommented:
You're right I missed the DHCP part.  For fail over I think you could use the alternate configuration in the tcp/ip settings.  
But it is mostly better to deliver DHCP through the SBS server.  Most probably the connection specific dns suffix was not configured through the dhcp server,  this helps to resolve "companyweb" to "companyweb.mydomain.local",  but you can also configure that manually.  
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Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Your reasoning for using the ISP's DNS servers isn't really valid, since the chances of the SBS server going down (if properly maintained and deployed on sufficient hardware) are rather minute.  Compared with the problems caused by this configuration, you are MUCH better off making the SBS your DHCP server and configuring the network settings according to the best practices shown here:  http://sbsurl.com/msicw

FYI, using an IP subnet of 192.168.1.x will be problematic if you are planning on using the Small Business Server Connection Manager (VPN Client) and a user has the same IP range in their home.  It is generally recommended that you use 192.168.16.x for your SBS Network.

Jeff
TechSoEasy
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Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
And, FYI, is you are firm on keeping things the way that they are, you just need to put a line in each workstation's HOSTS file pointing companyweb to the server's IP address.

Jeff
TechSoEasy
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NetSarCAuthor Commented:
I solved it by setting the SBS as DHCP server! Thanks for your advices!
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