How backup VPN configuration between two universities?

Hello, I am a student of the Greece and I have a graduation project to configure Backup VPN between two universities. Principal of communication made with leased lines. I study a lot, but now that it's time for implementation I have some thoughts:

-What hardware and software IOS do I need? Cisco 1841 it is ok for A & D routers?

-Use GRE IPSec transport mode or IPsec Tunnel mode?

-What will be the failover mechanism for switching traffic lines leased to IP VPN Backup and opposite? A teacher told me something about the Interface Prioritys. I read somewhere that this is done with the such as EIGRP routing protocol. who was right the Professor or the book?  :-D

-In the same place, they have Firewall and NAT, I need to do any action for this?

The attached file contains topology I want to implement

'My' talk site 1

2 a Central Site

E communicates with A, but no traffic is to A of E with normal circumstances. Subnet on E access Internet through F, then press D.    VPN will be implemented on the LAN but the specific source E traffic will pass through the Backdoor VPN (I think that the solution to this is ACL on the router). They have no routing protocol in 'my' site A directly connected routers and the default routes.

How imlement this?

I think the first thing to do is A to D connectivity

I will try to do this to tracers package first, but how can ' I imitate the SP network?

I need help I can get!

Hi John,.

In our scenario, given that our main connection is a direct leased line between E and F, so I guess there is no other network between the two routers. In this case we do not need to configure SLA monitoring or any interface a priority. We can simply enter two default routes:

IP route

IP route 254

In this scenario, if the leased line interface goes down, the second default route is used and the traffic should be routed by A router.

SLA monitoring monitors connection (using the ping tests) by one of the interfaces of the router, and when we are not able to ping from one server (specified in the configuration of the SLA) through the interface, then we change the default track to track traffic through some other interface.

So, in your scenario, we can monitor the connection between E and F, and when the link goes down, we can change the default route to point a.

This is useful in the scenario where we have another ISP connection as our primary connection.

Here is a link on how to configure SLA monitoring on the router:

http://www.Cisco.com/en/us/docs/iOS/12_4/ip_sla/configuration/guide/hsicmp.html

After you have configured the SLA followed by using the link above, you can bind it to the default route by using the following command line:

track road IP / / default main route

IP route 255 / / default route with a metric of higer that comes into play when the main default route goes down

In addition, the sample configuration that you give in the doc is almost correct, defined transformation is missing just a hashing algorithm. Here is a link with an example for a tunnel from lan-to-lan between two routers:

http://www.Cisco.com/en/us/partner/products/HW/routers/ps221/products_configuration_example09186a008073e078.shtml

Tags: Cisco Security

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