I have upgrade my 515 pix from 6.3(4) to 7.0(4). I have configured frist,one l2l VPN with remote 501 pix(6.3),and then work well,after i have configured one vpn for remote access from host behind nat but doesen't work!
In this sample configuration, a remote PIX receives an IP address through Dynamic Host Configuration Protocol (DHCP) and connects to a central PIX. This configuration enables the central PIX to accept dynamic IPSec connections. The remote PIX uses network address translation (NAT) to "join" the privately addressed devices behind it to the privately addressed network behind the central PIX. The remote PIX can initiate connections to the central PIX (it knows the end-point), but the central PIX cannot initiate connections to the remote PIX (it does not know the endpoint).
