IPSec Site-to-Site VPN

Step by step create the following...

1. ISAKMP tunnel (IKE Phase 1) included: Hashing + Authentication + Diffie Hellman Group
2. IPSec tunnel (IKE Phase 2) included: Encryption + Lifetime 
3. Access-list to permit (Interesting traffic)
4. crypto map 
5. apply to interface

After all this configuration

R1# ping 10.0.1.1 source lo0 (!!!must be successful)

R2# ping 192.168.1.1 source lo0 (!!!must be successful)

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Hashing           = MD5 / SHA
Authentication  = pre-shared key / certificate
Diffie Hellman  = Diffie Hellman Group 1 (or) 2 (or) 5
Encryption       = DES / 3DES / AES 128 / AES 256 (AES 256 is recommended)

>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<