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GRE and ASA5510

I want to establish VPN with GRE over IPsec. As ASA can't end GRE  tunnels, I should pass it through inside to another 1841 router in  datacentar network. Since datacentar is connected to internet via two  wan links (separate ISPs) is it possible to establish two gre  simultanous sessions between 1841 at branch office and 1841 at  datacentar, one session per wan link at datacentar? That way, I need 8  gre separate sessions (tunnels) at datacentar 1841 router. Is it  supported?

Is GRE passthrough works like regular port forwarding or it is something that ASA handles with some special commands?

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Re: GRE and ASA5510

Yes you can, you will need to configure 2 VPN tunnels, then use static routing in the data centre to terminate the 2 gre tunnels.

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