I have a 3560G connected to a few linksys srw2024 and I am receiving a large amount of ovverun errors on the linksys sides of the connection. Do I need to rate limit or somehow throttle the bandwidth on the cisco side?

what is the part number to upgrade to the advanced IP ios?

I have static nat on inside to the VPN so that internal clients can access the VPN. The problen is that VPN clients and L2L conections cannot access the dmz. Any thoughts?