VLan traffice through a Cisco ASA 5510

 
 
I have a Cisco ASA 5510 with a layer three switch with one lan & one vlan, multiple VPN’s and internet access see sketch below.


    sub C   sub D   sub E

      VPN     VPN    VPN    Internet
        |          |         |       |
        |          |         |       |
     --------------------------
     |        ASA 5510        |
     |                               |
     --------------------------
                    |
                    | Lan Sub a
                    |
     ________________
     |    Layer 3 Switch    |
     |                               |
     --------------------------
        |
       Vlan sub B







The Vlan is on our layer three switch (Not Cisco) and can communicate between "Lan sub a" and "Vlan sub B",
however I get blocked when trying to send any traffic through the ASA5510's external interface.

What is the correct method for allowing traffic to travel through the Cisco to remote vpn’s and the internet? The debug window shows
the following when I ping a known external address:

Teardown ICMP connection for faddr x.x.x.x/0 gaddr External-1/54992 laddr "vlan sub b"

and if I ping a device on "Sub C" from "Sub B" I get the following:

Build outboud ICMP connections for faddr "Sub C"/0 gaddr "sub b"/512 laddr "sub b"/512
Teardown ICMP connections for faddr "sub c"/0 gaddr "sub b"/512 laddr sub b"/512