After a day of google searches and troubleshooting I couldn’t find a proper solution that was easy and explained properly for my type of standard setup. Here is how I configured an ipsec VPN tunnel between the SSG and ASA.

Cisco ASA 5505

• IP: 1.1.1.1
• Network: 192.168.1.0/24

Juniper SSG 320M

• IP: 2.2.2.2
• Network: 192.168.2.0/24

192.168.1.0/24 < -> 1.1.1.1 < --VPN Tunnel--> 2.2.2.2 < -> 192.168.2.0/24

Here is the actual configuration including all the access list to allow all traffic through, you will probably want to lock this down as it will allow all traffic through.

Cisco ASA 5505 Configuration

object-group network local_cisco_network
network-object 192.168.1.0 255.255.255.0
object-group network remote_juniper_network
network-object 192.168.2.0 255.255.255.0

access-list ciscovpn_nat_junipervpn extended permit ip object-group local_cisco_network object-group remote_juniper_network
access-list ciscovpn_nat_junipervpn extended permit ip object-group remote_juniper_network object-group local_cisco_network

access-list ciscotojuniper_cryptomap extended permit ip 192.168.1.0 255.255.255.0 192.168.2.0 255.255.255.0

crypto map outside_map 1 match address ciscotojuniper_cryptomap
crypto map outside_map 1 set pfs
crypto map outside_map 1 set peer 2.2.2.2
crypto map outside_map 1 set transform-set ESP-3DES-SHA

tunnel-group 2.2.2.2 type ipsec-l2l
tunnel-group 2.2.2.2 ipsec-attributes
pre-shared-key

Juniper SSG 320M Configuration

set address “Trust” “192.168.2.0/24″ 10.248.1.0 255.255.255.0
set address “Untrust” “192.168.1.0/24″ 10.0.10.0 255.255.255.0

set ike gateway “1.1.1.1″ address 1.1.1.1 Main outgoing-interface “ethernet0/1″ preshare “” proposal “pre-g2-3des-sha”

set vpn “1.1.1.1″ gateway “1.1.1.1″ no-replay tunnel idletime 0 proposal “g2-esp-3des-sha”
set policy id 2 name “1.1.1.1″ from “Trust” to “Untrust” “192.168.2.0/24″ “192.168.1.0/24″ “ANY” tunnel vpn “1.1.1.1″ id 0xa pair-policy 1
set policy id 2
exit
set policy id 1 name “1.1.1.1″ from “Untrust” to “Trust” “192.168.1.0/24″ “192.168.2.0/24″ “ANY” tunnel vpn “1.1.1.1″ id 0xa pair-policy 2
set policy id 1
exit

This configuration will allow traffic from 192.168.1.0/24 to 192.168.2.0/24 and vice versa. On the Juniper side the name of the vpn and gateway I think are important otherwise the Phase 1 negotiation will not work. If I’ve missed something or if you don’t understand something please let me know.

I will probably need to configure this against a Cisco router in the near future so stay tuned for an update for the cisco side.