Configuring NAT with IP Unnumbered

[jclark888]

Basically, I configured NAT on my Cisco 1720 series router. it works fine when I assign an ip address to the serial 0 interface. However as soon as I remove that ip address and use the ip unnumbered FastEthernet0/0 command on serial 0 and it wont' work. I can ping any internet site once I'm inside the router, however when I get to my workstations I can only ping the fast ethernet address.

Here is small section of the code:

!

Interface serial0/0

description to worldcom

bandwidth 1536

no ip address

encapsulation frame-relay ietf

no fair-queue

frame-relay lmi-type ansi

!

interface serial0/0.1 point-to-point

bandwidth 1536

ip unnumbered fastethernet0/0

ip nat outside

frame-relay interface-dlci 500 ietf

!

interface fastethernet0/0

description to office fastethernet

ip address 65.220.47.97 255.255.255.224

ip address 10.130.52.1 255.255.255.0 secondary

ip nat inside

speed auto

full-duplex

!

[spremkumar]

hi

from u r post wht i feel is from u r router whenever u ping its taking ur public ip as the source to go out ,if u can do a extended ping with source as ur 10.x.x.x tht will help u out and again afaik since u hve mentioned both the ips on the same interface it may also give some problems.

is it possible for u to create a loopback and assign the publc ip instead configuring the public ip in ethernet?

is ther any constraints or any servers kept on the network ??

whts the kind of nat ur using PAT or SNAT ?? do clarify tht too...

regds

[jclark888]

I am using pat. I will try to create a loopback interface and assign the public IP address from there. Thanks for the help. I will let you know if it works.