I have a working configuration on two Juniper Netscreen devices that I'm trying to replicate on an ASA 5505. Here's the scenario:
+-----+ 77.77.77.77 +-----+ 10.20.0.0/24 *******
| WAN | =============== | ASA | ------------ * DMZ *
+-----+ +-----+ VLAN 20 *******
|
| 10.30.0.0/24 ***********
+---------------- * Clients *
VLAN 30 ***********
I'm trying to perform PAT on both internal subnets (i.e. so all internal clients can access the internet). However, when I try to configure the NAT rules using ASDM, it says that there's a PAT range overlap. There must be some way to configure the NAT rules such that both zones/subnets can share an external PAT IP (just like in ScreenOS), but I haven't found it yet.
Unfortunately, ordering extra external IPs isn't an option at the moment, so I hope there's a way to do this without purchasing any more gear.