Site-to-Site Tunnel Best Solution

[Osman_gadji_2]

Hi all
Prompt the best solution to organize the tunnel for my future business network.
I have several connections to the Internet at the central office and branches, as shown in Figure
In the presence of a Cisco 3845 and some 2811 routers.
Questions
Which tunneling protocol is best to use?
How to ensure the high availability for branch office users?
Thanks

[Collin Clark]

There's a good book on VPN design including high availability-

http://www.amazon.com/IPSec-VPN-Design-Vijay-Bollapragada/dp/1587051117/ref=sr_1_1?ie=UTF8&qid=1288101844&sr=8-1

Hope it helps.

[Leo Laohoo]

Which tunneling protocol is best to use?

IPSec over GRE using Virtual Tunneling Interface (VTI)

How to ensure the high availability for branch office users?

Presume you have one physical link to/from the site and you have multiple core routers and each core router has at least one physical link, then I'd configure the site router with multiple tunnel (VTI) interfaces.  I'd put a cost down to each tunnel so I can force traffic to take the path of my choice.   Traffic shape the links.

Hmmmm ... your core is a 3845 ... how big is the pipe?

Does this answer your question?