Routing issue with dual Ethernet NICs - Internal/External Configuration under Windows 8.1 - what am I doing wrong ?

I have a PC hosting Windows 8.1, attached to two Networks. One leads to the internet - and uses the private IP address (172.*) the other is purely internal (also using the private address 198.*) but, has no internet connectivity. I'm finding
that if I don't disable my internal NIC, I can't access any internet sites. Is this a bug, or have I not done something correctly.
I have also, a Windows 7 PC, attached to the same Networks, and it exhibits no issues when connecting to either the internet or to internal locations.
(Both are Enterprise builds, though only across a Windows for Workgroups network).
Can anyone tell me what I need to be doing with Windows 8.1 please, to make both internal & external network connectivity work as is the case with Windows 7 ?
I'm only running IPv4, and both Wired Networks have at their respective ends, Routers that support DHCP & NAT. Though the internal Router's external port is not connected to anything.
Thanks in advance...

Hi,
Can you tell me what you have tried so far and how did you set?
Firstly please update all network adapter driver.
After that, do the following:
1. Open the Command Prompt (Admin).
2. Run "Ipconfig /all" to check your nics IP information.
3. Use route command tell the computer which interface you want the packets to leave from.
Assuming Network A is...
10.10.11.0 /24
Router is 10.10.10.1
and Network B is...
10.10.12.0 /24
Router is 10.10.10.2
then use this command:
route add 10.10.11.0 mask 255.255.255.0 10.10.10.1 -p
route add 10.10.12.0 mask 255.255.255.0 10.10.10.2 -p
Hope this helps.
Karen Hu
TechNet Community Support

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>>>
From: Andy_DeWees<[email protected] du>
To:novell.support.zenworks.endpoint-security-management
Date: 2/5/2009 12:52 PM
Subject: I have installed the agent 10 or 15 times and one installation hasfailed, no error appeared during the installation but I am havinginconsistent issues with my ethernet card not working here and there. Werebooted and can log into Novell client but the login prompt did not appearfor ESM client or the icon was not in the systray. Everything seems towork, besides at times (a couple times today) it terminates his ethernetcard/connection. I would re-image his computer but he has severalapplications and
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Attachments:
RPM.vi ‏92 KB

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Message Edited by Matt A on 09-04-2007 07:58 PM
Matt Anderson
Hardware Services Marketing Manager
National Instruments
Attachments:
RPM (Modified).JPG ‏17 KB
RPM (modified).vi ‏72 KB

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