Cisco 7507 to Netscreen firewall IPSEC tunnel problems.

[DAWNOLA]

Hello. I am having problems with a IPSEC tunnel between a cisco 7507 and Netscreen firewall (dont know the type). I can establish the tunnel and it shows as up on both sides, however I cannot pass any traffic over the tunnel. My config looks like this:

**CRYPTO**

crypto isakmp policy 1
encr 3des
hash md5
authentication pre-share
group 2
crypto isakmp key ****** address a.b.c.d
!
!
crypto ipsec transform-set proposal4 esp-3des esp-md5-hmac
!
crypto map s4second 20 ipsec-isakmp
set peer a.b.c.d
set transform-set proposal4
set pfs group2
match address 111

**INTERFACE**
interface FastEthernet5/1
ip address a.b.c.d a.b.c.d
half-duplex
crypto map s4second

**ACCESS-LIST**
access-list 111 permit ip host 67.128.57.18 63.79.178.192 0.0.0.3


Am I missing anything obivous here? Any help with this would be appreciated.

Thanks.