i'm trying to figure out the configuration to obtain a dual nat routing.
I have 1 + 8 public ip addresses:
Now i would have 2 private ip addresses on the router (192.168.0.1 and 192.168.0.2) so that clients using 192.168.0.1 as default router are natted via 126.96.36.199 while clients using 192.168.0.2 as default routerare natted via 188.8.131.52
This is normal behavior, a layer 2 port(switchport) can't be configured with an IP address, you have to configure a vlan interface and give it an IP address.
Now concerning your original problem as your 2 IPs on the router will be on same interface( using secondary address),you'll have to split your network in half( one half using the primary address and the other half using the secondary address).The other solution I can think of right now would be using VRF Lite( so any host can use any IP as default gateway and you should be able to achieve what you want).
On Cisco 800 router, you should be able to find a standalone single port WAN interface, under that port you should be able to assign multiple sub secondary addresses as many as you want to. Please stick to actual subnet mask given for those ip addresses by your ISP.
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