We have recently moved a large client from a flat network structure at each site ( more than 30 total sites) and an unstructured routing plan from edge to core. They now have a structured WAN that coincides with their LAN Structure. Since we completed the transition we have noticed thousands of failed nat translations on the INSIDE of our ASA. From doing a bit a research we have narrowed these packets down to requests from hosts on the new networks requesting resources on the the old network.
I attempted to create static routes for these old networks with a gateway of loopback 0, to force the Core router to dump the packets instead of forwarding them to the default router which is my edge ASA. However I either did this wrong or I am trying to be to clever because it did not affect the packets getting through to the INSIDE of my ASA.
Does anyone out there have a better idea or can you help me understand what I did wrong with my static route? As a secondary does anybody out there have an idea or an example of how to run down all these devices that are calling old ip resources?
Thanks for your help.