Solved

Problem Connecting to some computers on a different subnet

Posted on 2008-10-16
9
273 Views
Last Modified: 2010-04-18
Our VoIP and corporate networks are on seperate subnets.  We are having a problem with our VoIP server connecting to the Exchange server.  We can ping through from one subnet to the other from the routers and from the VoIP to the DC on the corporate side and vise versa but no other servers on the corporate side will talk with the VoIP server.  This was working then and there have not been any changes to routing or major changes to the serverr
0
Comment
Question by:ivwildbil
  • 5
  • 3
9 Comments
 
LVL 7

Expert Comment

by:cmarandi
ID: 22732766
How is your DNS setup?  Is there a forwarder on the DNS for each subnet?  

WINS running anywhere?  Maybe on one subnet and not the other, therefore causing DNS on one subnet to purge records because of decay.
0
 

Author Comment

by:ivwildbil
ID: 22733931
Name resolution is working fine.  The VoIP server is using one of the DCs for DNS resolution.
0
 
LVL 7

Expert Comment

by:cmarandi
ID: 22734181
Switch configuration... Are you using a managed switch?  On my managed switch I control the traffic types going between the two subnets... for example no icmp.
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Accepted Solution

by:
ivwildbil earned 0 total points
ID: 22734855
That "MIGHT" be the case but I doubt it.  I'll double check but I don't think there is any filtering on the switches.

And we have resolve the problem by adding a static route to the VoIP network on the Exchange server.  The other servers are still not get to the VoIP network but they do not have a need to connect to that network.  The question now is why this stopped working.  One of the DCs has a static route but the other does not and it is routing to the VoIP network.
0
 
LVL 7

Expert Comment

by:cmarandi
ID: 22735502
Kind of an odd question:
Did you recently introduce a 2003 R2 DC where you had to upgrade the active directory to 31?
0
 
LVL 38

Expert Comment

by:ChiefIT
ID: 22742252
Could this be a Netbios issue??

Netbios broadcasts are not routeable, meaning it will not propogate over different subnets, through a VPN tunnel or across NAT.

Wins is routeable and can be used to bridge the two subnets. All you need is a WINS connection between your PDCe (as the domain master browser) and a server on the other side (as a master browser for that subnet).

I have seen netbios broadcasts work for a while, then just die for no appearant reason.

Here is a good article that explains the Browser service:
http://www.microsoft.com/resources/documentation/windowsnt/4/server/reskit/en-us/net/chptr3.mspx?mfr=true

0
 
LVL 7

Expert Comment

by:cmarandi
ID: 22742710
I'm still baffled as to why it would suddenly change... That's why I was asking about the R2... When you introduce an R2, you have to upgrade the AD to 31 which changes the domain name scheme to must have the .com
So I wonder if a schema changed that is causing the VOIP to not communicate with the domain properly.
0
 

Author Comment

by:ivwildbil
ID: 22753937
R2 was not recently changed and there have been no major changes to AD architeture.
0
 
LVL 7

Expert Comment

by:cmarandi
ID: 22759986
No changes on Exchange?   Can you make sure the VOIP is configured properly and is using the correct Exchange settings?
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Restoring deleted objects in Active Directory has been a standard feature in Active Directory for many years, yet some admins may not know what is available.
While rebooting windows server 2003 server , it's showing "active directory rebuilding indices please wait" at startup. It took a little while for this process to complete and once we logged on not all the services were started so another reboot is …
In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Servers >> Data…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question