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NAT question

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I have following setup..


rtr ext ip *
rtr internal ip is pravate addr
fw ext ip is a private addr **
fw int ip is also private ip

i need to NAT my fw ext ip of to or 56 if possible

how will i config this on my rtr?
below some of my current config.

interface Ethernet0
ip address
ip nat inside
hold-queue 100 out
interface ATM0
mtu 1460
no ip address
atm vc-per-vp 64
no atm ilmi-keepalive
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
interface Dialer1
ip address
ip accounting output-packets
ip accounting access-violations
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap pap callin
ppp chap hostname ************
ppp chap password 7 **************
ppp pap sent-username ************* password 7 ***********
hold-queue 224 in
ip nat inside source list 102 interface Dialer1 overload
ip classless
ip route Dialer1
ip http server
access-list 102 permit ip any
access-list 103 permit ip any any
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