Solved

Windows 2008 Server second intranet NIC causes first NIC Internet to disconnect

Posted on 2010-09-09
3
2,047 Views
Last Modified: 2012-05-10
I have two NIC connections on IBM server running Windows 2008 Server w/ SQL 2008. The first NIC has been running great for the first month while in production at client site. We have now moved the CISCO ASA 5500 from the old 2003 server second intranet NIC to this new 2008 Server on its second NIC card.

The config on the first NIC for Internet is ip 192.168.2.7 / sm 255.255.255.0 / gw 192.168.2.10 / dns 192.168.2.10. .10 is our ZyWALL firewall device.

The config on the second NIC for CISCO is ip 192.168.3.2 / sm 255.255.255.0. No gw or dns.

When I enable the second NIC - its cause all the clients to lose connection to the server. They can't ping 192.168.2.7 anymore. However I can still get out on Internet from the server console. If I disable the 2nd NIC - the clients can ping the server again.

What is causing this? It worked fine on the 2003 server. Thanks.
0
Comment
Question by:interc3905
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 57

Expert Comment

by:giltjr
ID: 33645511
Are all of the clients in the 192.168.2.0/24 subnet?  
If not, do they have a specific route to get to 192.168.2.0/24 or do they use their default route/gw?

Have you displayed the routing table on the server?

netstat -rn

What does it look like before you enable NIC2 and after you enable NIC2?

0
 
LVL 59

Expert Comment

by:Darius Ghassem
ID: 33645972
If you have a internal DNS server then point the server to this DNS server in your TCP\IP properties.

Go to your Network Connections click Advance Settings check your binding order to make sure your primary NIC is listed first.
0
 

Accepted Solution

by:
interc3905 earned 0 total points
ID: 33662944
I reversed the settings on the two NIC cards and now it works. Also found this TIP from Microsoft:

Windows 2008 introduces a "strong host model" that doesn't allow the different NICs to talk to each other.  For example, if a request comes in on the 2nd NIC and there's no default gateway setup, then the NIC will not use the 1st NIC to reply to the requests.  (even though there's a default gateway setup on that 1st NIC).  

In order to change that behaviour and go back to a 2003 model, you go to the command prompt and then you type:

netsh interface ipv4 set interface NLB weakhostreceive=enable
netsh interface ipv4 set interface NLB weakhostsend=enable

(where NLB is the name of the network interface... default is Local Area Connection)

 - Jim
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

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

Suggested Solutions

We recently had an issue where out of nowhere, end users started indicating that their logins to our terminal server were just showing a "blank screen." After checking the usual suspects -- profiles, shell=explorer.exe in the registry, userinit.exe,…
I was supporting a handful of Windows 2008 (non-R2) 2 node clusters with shared quorum disks. Some had SQL 2008 installed and some were just a vendor application that we supported. For the purposes of this article it doesn’t really matter which so w…
This tutorial will show how to configure a new Backup Exec 2012 server and move an existing database to that server with the use of the BEUtility. Install Backup Exec 2012 on the new server and apply all of the latest hotfixes and service packs. The…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles to another domain controller. Log onto the new domain controller with a user account t…

749 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