Is it possible to conifigure DMVPN on an ASA 5520? My Company currently has 4 offices with Cisco 2811 routers and IOS's on all of them which support DMVPN. I would like to be able to configure the ASA as the Hub and the 2811 routers as the spokes.
I have not seen this done with a PIX. To the best of my knowledge you need a router.
I have seen a couple of instances where the PIX was configured to let the GRE though to a router sat behind it. This router was responsible for terminating the DMVPN. From memory I am sure that NAT was a problem so you may need to ensure that there is either a public address on the outside of your DMVPN router that it untranslated as it goes through the PIX, or alternatively a static translation from an outside global pool that maps to the outside of your DMVPN router.
On your PIX you will need to allow pass through of the appropriate GRE & IPSEC policies.
Please search Cisco in the first instance to validate the above. It was a while ago when I looked at this.
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I had similar problem some time ago. But in my case it was a PIX instead ASA. I did find that it is not possible to configure DMVPN on PIX. I dont know this issue on ASA, but I expect the same. You need the router.
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