Windows Routing table and default gateway

We have installed an IPVPN network between our three offices. This will replace the existing links, that are comprised of Internet links with VPNs setup on a firewall at each office. Each office has a separate IP subnet.

The default gateway for the network is set to one of the firewalls via a system policy.

There needs to be a period when the existing links continue to be used for Internet access, while all traffic between our offices is sent via the IPVPN.

I need to understand the options that are available to me to implement. My initial thought was to create a routing table entries on all machines for each destination subnet.

I am not sure if this is the best way to implement the solution, as it would mean updating each machine and I am not sure of the order of precedence, ie, does the routing table entry override the default gateway?

We are using Hyper-V, with Windows Server 2003 guests, physical Windows Server 2008 R2 and Server 2003 machines, Windows/XP client (slowly being replaced) and Windows 7 Pro machines.

I am considering testing the changes by initially changing only one PC at each site, but I do not know how I can prove that the inter-office traffic is indeed using the IPVPN.
jon_kershawAsked:
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
That should do.
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The best approach is to modify the routes on each default gateway, because that is a single point for changes.
In routing tables, any entry being more specific than an other is checked first. So if you have a host route (subnet 255.255.255.255 = 1 single IP), this will always be checked prior to own network routes (subnet 255.255.255.0 or the like), and those again prior to default routes.
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jon_kershawAuthor Commented:
Thank you for the information.

The gateways at each office are Cisco routers that have been provided by the IPVPN provider. The provider has created routes to the other other routers in the router routing tables.

I believe the best way for me to implement the change will be to alter the default gateway on each of the DHCP servers and then use separate entries for browser proxy servers, pointing to the firewall devices. Would you agree?
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jon_kershawAuthor Commented:
Thanks for that, I will accept your response and close the question. Thanks again for your help.
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