We have a new ASA 5545 with multiple internal VLANs. After much reading, I am more confused than ever regarding the new NAT. Could somebody please help with this simple example w/ several internal VLANs? I would like to setup acl's to filter connections between all these internal VLANs, allowing services such as ssh for example from some VLANs to other VLANs. I would like to setup ingress and egress filtering for all VLANs. Currently, Host 172.16.3.100 cannot ping host 172.16.0.100, however each of these hosts can ping their respective gateways. Also, I am not clear as to when to use object NAT versus Twice NAT.
Interface Name Security-Level
Port-channel1.33 test 75 Port-channel1.43 research 70 Port-channel1.100 management 40 Port-channel1.200 administration 50 Port-channel1.300 remote 30
Port-channel1.33 test 172.16.3.248 255.255.255.0 Port-channel1.43 research 10.3.43.248 255.255.255.0 Port-channel1.100 management 10.0.0.248 255.255.255.0 Port-channel1.200 administration 10.0.1.248 255.255.255.0 Port-channel1.300 remote 172.16.0.248 255.255.255.0
Keep in mind that static NAT rule are bi-directional.
WIth the NAT in place, you can still control ingress/egress traffic with ACLs, but if no ACLs are used keep in mind interfaces with higher security-levels are allowed to communicate with all interfaces with lower security-levels implicitly.
Normally you would not have NAT going between subnets connected to the ASA, unless you have a specific reason for doing so. And having an egress ACL on the ASA is just about never used these days, all ACLs are normally applied in the ingress direction on an interface.
As for when to use the different NAT types depends on what you are trying to do. So there are three types of NAT in the new ASA - Manual NAT, Auto-NAT, and After-Auto (or manual after-auto). And they are executed in that order aswell.
So in the manual NAT field you would normally have your NAT exempt or twice NAT statements.
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