Internet Access through TMG for all HO & Branch office

Dear Experts!,
I am new to the Forefront TMG 2010. Have requirement to implement internet access.
Head office : 192.168.11.x/24 (192.168.11.1 is the TMG server)
Branch Office 1: 192.168.12.x/24
Branch Office 2 : 192.168.14.x/24
Branch Office 2 : 192.168.16.x/24
Forefront TMG 2010 standard edition.
Having 3 NIC's two have different ISP network addresses and one has 192.168.11.1.
Branch office are connected using MPLS network, the requirement is all branch site internet must be accessed through TMG 2010 server which is homed in Head Office. How to achieve ?
What needs to be done in external firewall and in TMG for enabling internet access.
Thanks!
Regards, Ganesh, MCTS, MCP, ITILV2 This posting is provided with no warranties and confers no rights. Please remember to click Mark as Answer and Vote as Helpful on posts that help you. This can be beneficial to other community members reading the thread.

Hi Ganesh,
Hope this helps
1 - If you wish to give internet as Proxy to users.
Ensure the Below subnet is able to reach TMG Internal Interface that is 192.168.11.1
Subnet
Branch Office 1: 192.168.12.x/24
Branch Office 2 : 192.168.14.x/24
Branch Office 2 : 192.168.16.x/24
Configuration
Enable Proxy in TMG and configure Proper Ports as per your requirements
On the Client IE – Ensure you put Proxy IP as TMG and Port configured in TMG configuration.
Enable a Rule
Access Rule
Source : Internal
Destination : External
Ports : HTTP / HTTPS
Users : Authenticated Users
2 As normal Internet as Gateway to users
You need to request your MPLS provider to change the Default Route of below subnet to 192.168.11.1. By doing this, all the internet request from the below subnet to internet will hit TMG.
Subnet
Branch Office 1: 192.168.12.x/24 Default Route 192.168.11.1
Branch Office 2 : 192.168.14.x/24 Default Route 192.168.11.1
Branch Office 2 : 192.168.16.x/24 Default Route 192.168.11.1
IF you have any L3 Switch then you can also make Default gateway as L3 for all the subnet and from L3 device point it to TMG
Enable a Rule
Access Rule
Source : Internal
Destination : External
Ports : HTTP / HTTPS
Users : All Users ( Important )
Two ISP
In network Rules : You need to use NAT
You will have a Rule which NATS internal to  External
On external - Choose which ISP interface should be used  and Apply NAT rule

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