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How could I add NAT with private subnet to this Cisco 2500 config?

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There's this Cisco 2500 with one V.35
port going to an HDSL DCE, and the ethernet port to a Cisco PIX; there are also other
IPs (subnet 80.something) in the configuration on the serial side that are used to route
traffic to the DSL provider.



I'm wondering if it
is possible to remove the PIX and move everything on the Cisco 2500 - I can usually
manage to do this when the public IP is on the wan-facing port and the private IP on the
lan one, but I don't know how could I add a private IP to the 2500 and use the public
one for nat when they're both on the same internal
interface.




The current config for the
2500 looks like:



ip
            subnet-zero
!
interface Ethernet0
 description connected
            to PIX
 ip address 217.x.x.1 255.255.255.248
 ip nat
            inside
 no ip directed-broadcast

 no ip
            mroute-cache
 no cdp enable
!
interface Serial0

            no ip address
 no ip directed-broadcast
 no ip
            mroute-cache
 encapsulation frame-relay
 bandwidth 1024

            no cdp enable

!
interface Serial0.1
            point-to-point
 ip address 80.x.x.x 255.255.255.252
 ip nat
            outside
 frame-relay interface-dlci xxx IETF
 bandwidth
            1024
 no ip directed-broadcast
 no cdp
            enable
!
ip classless

ip route 0.0.0.0 0.0.0.0
            Serial0.1


The PIX has
217.x.x.2 on its WAN interface and uses the 2500's 217.x.x.1 as default
gateway.



I would like to remove the PIX and
connect the LAN directly to the Cisco 2500, which would have 192.168.1.1/24 on its
Ethernet port and NAT everything out from one of the 217.x.x.X IPs. After that I will
probably want to also add other static IPs to the Cisco from the 217.x.x.X/29 subnet and
use them to portforward some services to internal servers.



Answer




There's lots of documentation on cisco.com about NAT
services.



Try starting
at:




href="http://www.cisco.com/en/US/partner/prod/collateral/iosswrel/ps6537/ps6586/ps6640/prod_qas0900aecd801ba55a.html"
rel="nofollow
noreferrer">http://www.cisco.com/en/US/partner/prod/collateral/iosswrel/ps6537/ps6586/ps6640/prod_qas0900aecd801ba55a.html



As
a general guide, you would want 'ip nat outside' on s0/0.1, 'ip nat inside' on
e0.



You would make a NAT pool using your
217.x.x.1/29 addresses, that things on the inside could use. They would not appear on an
interface anymore.


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