Should i use VPN over a leased line for HQ & Branch

Dear All

Background
HQ:


HQ Network
SSG140
    |
    |  2M Leased Line
    |
SSG5
Branch Office Network

I used Site to Site VPN to Successfully connected both Networks. (It is working ok).
I know that instead of VPN, i can create route between networks & consider the things between 2 firewall a cable.  

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My questions is
Anything else that i should pay attention to?????
Any Advantage or Disadvantage of using VPN here?????
How much overhead of VPN over direct routing????

Experts, please kindly share your experience?

Gordon TinIT ManagerAsked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
The second approach (2 firewalls) leaves your network open to attack at both ends because the traffic is public.

The first approach (VPN) ensures the traffic between sites is closed and encrypted and is much (much) more secure than the first approach. This approach (VPN) is a very common way to hook up two sites because of the overall security offered.

.... Thinkpads_User
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ujitnosConnect With a Mentor Commented:
If you have a leased line between your HQ and branch, then there is no need for a VPN setup. VPN does provide extra security to the data being transferred, but in your case the HQ and Branch can be considered as a WAN setup. Now as this leased line is just for your use, there wont be any other company's traffic through it. Configure rules in the firewall to allow only specific and relevant ports for communication and you should be safe enough.

 
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Gordon TinIT ManagerAuthor Commented:
Good Support
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Gordon TinIT ManagerAuthor Commented:
good Support
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JohnBusiness Consultant (Owner)Commented:
Thank you. I was pleased to help.   ... Thinkpads_User
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