Creation of VPN for office

Hello

I'm looking for some feedback about problems with the following design.

We currently have a HQ site with an internet connection of 100 Mbps, which ends on an external L2 switch. A Cisco ASA 5520 is then connected to the L2 switch and configured with a public IP addess. The Cisco ASA firewall is configured with NAT and handles all of the traffic internet headquarters

I need to add a site of management via a VPN, but we need the ability to use multicast via the VPN and also use the HQ site for all internet traffic, so the branch will use a default route to Headquarters and traffic peaks and then back out to the internet.

I thought installing a router series Cisco 2900 in parallel to the Cisco ASA with an interface connected to the switch external and internal interface connected to the switch HQ, then Configuration GRE over IPsec and then advertising on the default using EIGRP. Similar to the attached physical design.

Did anyone see any problems with this Setup? Wouldn't be better to connect the LAN of 2900 to an interface DMZ on the SAA for security?

Thank you

It is a design that I use quite often (for customers with 'normal' security needs) which works very well. As a switch inside, I always use a Layer 3 switch with two transfer networks, 8, at the ASA (s). With which you have total control over the routing on the L3 Switch.

As an alternative for customers who want to filter the traffic branch also on the SAA I connect to the internal interface of the router to a DMZ on the ASA interface. Then there is only one device (the ASA) for the application of the policies instead of two (ASA and router). In the old days of the Concentrator VPN I also had the public interface of the VPN gateway on a demilitarized zone to protect the VPN gateway on the internet, but complicating the delivery of many.

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Tags: Cisco Security

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