I'm trying to configure PPP on a 2514 router. The ISP wants me to use a
public IP address on both e0 and s0. The previous ISP had frame-relay and I
was using private IP addresses for e0 and NAT overloading.

I want to configure extended NAT on the router but not sure how i can do
this if i'm using public IP addresses for both e0 and s0. The internal
network is on private IP addresses and configuring a firewall behind the
router is not in the budget. 

New config: (From the ISP)
interface Serial0
 ip address 162.16.34.94 255.255.255.252
 encap hdlc <---default
interface FastEthernet0 
 ip address 164.65.13.89 255.255.255.252
ip route 0.0.0.0 0.0.0.0 162.16.34.93

Old config: (with the previous ISP)
interface s0
 ip address 167.129.130.198 255.255.255.252
 encap frame-relay ietf
 ip nat outside
interface e0
 ip address 192.168.1.1 255.255.255.0
 ip nat inside

ip nat pool Mypool 167.129.130.198 167.129.130.198 netmask 255.255.255.252
ip nat inside source list 100 pool MyPool overload 
access-list 100 permit ....


Thanks for your help.

Simer




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