To me seems that the setup possibly only contains 3 devices. ASA and 2-3 Routers?
Also seems to me that the routing is a bit messed up.
You are essentially using the native routing table and have connected the core 3750 with 2 links to the ASA
Would seem to me that all the networks behind your ASA route directly through the 3750 and dont go through the ASA?
What were the 2 networks which traffic should go through the ASA?
I would suggest going through the whole setup because it seems to me to make no sense at the moment. If you have a simple network then I would suggest sticking to static routing. Atleast I personally feel that I would not get much out of running dynamic routing protocol if there is no redundancy in the network and the network is small.
If you want to separate network with the ASA then you will have to bring those Vlans directly to ASA and let the ASA handle the inter Vlan routing. Naturally in this case the ASA might become a bottleneck for traffic because of limited throughput performance.
Other option would be to use VRFs on the 3750. This means essentially that you could separate certain networks/Vlans to their own routing table and let them have their own default route towards the ASA. In the same way you could have another VRF for some new network that would be separate from the rest of the network and connect that network to the ASA on their own link.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...