The Linksys router is running inbound one-to-many PAT (eg. x.x.x.146:80 --> 192.168.1.10:8080)
I'm looking to replace the setup with a Cisco 1841 router. Now normally I would configure the DSL interface as unnumbered to the internal LAN interface and use my public IP addys on this segment then passing through a PIX to NAT into private IP addys.
The problem I have is I want the 1841 to be an all in one box performing DSL, Firewall and NAT functions.
Now I thought I would configure the DSL as unnumbered to FastEthernet0/0 adding a secondary IP address of x.x.x.146/28. Interface configured as NAT outside.
Interface FastEthernet0/1 was configured with 192.168.1.1/24 with NAT inside and connected to the switch.
The problem was is that the FastEthernet0/0 interface line protocol was down as there was no need to connect it to anything.
I then tried assigning the dialer interface a static IP of x.x.x.145/28 and x.x.x.146/28 as a secondary IP running NAT outside. I tried again but during boot up the router said you cant assign a secondary IP to the dialer interface.
So my question is, how would you recommend setting up the interfaces to enable the router to have both x.x.x.145 and 146/28 as public IP's and NAT x.x.x.146:80 to 192.168.1.10:8080?
I am thinking you could configure a Loopback interface, configure that interface as NAT outside, and then assign your x.x.x.146 address to that interface. Then, make a static NAT entry for your internal address with the Loopback address as the outside address, e.g.:
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