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With 2 Internet Connections on Separate Routers, How Can I have 1 Gateway Dedicated to SBS2008 and 1 Gateway for the Clients?

Posted on 2010-09-23
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Last Modified: 2012-06-22
I have a small network running with 10+ clients and Microsoft Small Business Server 2008 as the mail server, DHCP, DNS, File Sharing, SharePoint, etc.  I have two internet connections of which one is a T1 and the other is a cable modem.  I want to dedicate the T1 connection to the SBS2008 and have all the client machines access the internet through the cable modem.  I would like to set it up this way so client internet traffic does not bog down the server's connection to the internet b/c I have a number of smart phones and vpn connections on any given day.  The more bandwidth I can reserve for remote users the better.

My question is how do I do this while using SBS2008 as the DHCP/DNS server?  I attempted using the clients/cable modem router as the DHCP server, but access the server was more problematic.  Also, SBS2008 is a much better DHCP server than DD-WRT/router.

My network diagram is below.  Any help would be appreciated.

r/Dan
Network.png
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Question by:plyrdan
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Accepted Solution

by:
Jimmy Larsson, CISSP, CEH earned 2000 total points
ID: 33745119
If your clients uses 192.168.2.1 as default gateway and the SBS uses 192.168.2.2 as default gateway you will ackomplish this.

On all hosts with static IP you configure the default gateway ackordingly manually, for the clients you change the "default route"-option in the DHCP-scope.

/Kvistofta
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Author Comment

by:plyrdan
ID: 33745187
kvistofta,

I used the wizard in SBS2008 to to set up the internet connectivity for the server and clients.  I assumed I would need to manually change the default route to 192.168.2.1 in either in the DHCP panel or in group policy.

Specific to your answer...if I change the default router will that effect the server using the 192.168.2.2 gateway?  The server must send email out this gateway due to having my rDNS settings tied to it.
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Author Closing Comment

by:plyrdan
ID: 33745486
Thanks.
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Expert Comment

by:Jimmy Larsson, CISSP, CEH
ID: 33745807
The DHCP-settings in SBS2008 is only for the DHCP-clients, not for the SBS himself. Ackordingly, the default gateway-setting under network connection in SBS is for the SBS himself. These two settings are unrelated to eachother and can be different.

/Kvistofta
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