There is conflicting info between the manual that came with my RVS 4000 and what is on the Linksys web page. The CD version of the manual says that the Key Lifetime for IKE phase 1 is 3600 seconds and phase 2 is 28800. The newer version of the manuial off the web site states the exact opposite. Which is correct? I've tried both and the tunnel stays up anyway. I am just curious. As usual the documentation is poor. I have been able to make the device build a stable IPSEC tunnel however. Thanks