R1:1.1.1.1
R2:1.1.1.3
R3:1.1.1.2

C R1 ping 10.10.10.10 идет на R3 через R2

R2:
interface Loopback0
ip address 10.10.10.10 255.255.255.0
ip nat enable

interface FastEthernet0/0
ip address 1.1.1.3 255.255.255.0
ip nat enable

ip access-list extended NAT
permit ip host 1.1.1.1 host 10.10.10.10

route-map NAT permit 10
match ip address NAT

ip nat source route-map NAT interface FastEthernet0/0 overload
ip nat source static 1.1.1.2 10.10.10.10 extendable


R3 debug ip packet:
*Mar 1 02:13:04.271: IP: tableid=0, s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), routed via RIB
*Mar 1 02:13:04.271: IP: s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), len 100, rcvd 3
*Mar 1 02:13:04.275: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), routed via FIB
*Mar 1 02:13:04.275: IP: s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), len 100, sending
*Mar 1 02:13:04.331: IP: tableid=0, s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), routed via RIB
*Mar 1 02:13:04.331: IP: s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), len 100, rcvd 3
*Mar 1 02:13:04.335: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), routed via FIB
*Mar 1 02:13:04.335: IP: s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), len 100, sending
*Mar 1 02:13:04.359: IP: tableid=0, s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), routed via RIB
*Mar 1 02:13:04.359: IP: s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), len 100, rcvd 3
*Mar 1 02:13:04.363: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), routed via FIB
*Mar 1 02:13:04.363: IP: s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), len 100, sending
*Mar 1 02:13:04.431: IP: tableid=0, s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), routed via RIB
*Mar 1 02:13:04.431: IP: s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), len 100, rcvd 3
*Mar 1 02:13:04.435: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), routed via FIB
*Mar 1 02:13:04.435: IP: s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), len 100, sending
*Mar 1 02:13:04.451: IP: tableid=0, s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), routed via RIB
*Mar 1 02:13:04.451: IP: s=1.1.1.3 (FastEthernet0/0), d=1.1.1.2 (FastEthernet0/0), len 100, rcvd 3
*Mar 1 02:13:04.455: IP: tableid=0, s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), routed via FIB
*Mar 1 02:13:04.455: IP: s=1.1.1.2 (local), d=1.1.1.3 (FastEthernet0/0), len 100, sending



R2 debug ip nat nvi:
*Mar 1 02:13:04.243: NAT: setting up outside mapping 10.10.10.10->1.1.1.2
*Mar 1 02:13:04.247: NAT: s=1.1.1.1->1.1.1.3, d=10.10.10.10 [160]
*Mar 1 02:13:04.247: NAT: s=1.1.1.3, d=10.10.10.10->1.1.1.2 [160]
*Mar 1 02:13:04.279: NAT: s=1.1.1.2->10.10.10.10, d=1.1.1.3 [160]
*Mar 1 02:13:04.279: NAT: s=10.10.10.10, d=1.1.1.3->1.1.1.1 [160]
*Mar 1 02:13:04.311: NAT: s=1.1.1.1->1.1.1.3, d=10.10.10.10 [161]
*Mar 1 02:13:04.311: NAT: s=1.1.1.3, d=10.10.10.10->1.1.1.2 [161]
*Mar 1 02:13:04.347: NAT: s=1.1.1.2->10.10.10.10, d=1.1.1.3 [161]
*Mar 1 02:13:04.347: NAT: s=10.10.10.10, d=1.1.1.3->1.1.1.1 [161]
*Mar 1 02:13:04.367: NAT: s=1.1.1.1->1.1.1.3, d=10.10.10.10 [162]
*Mar 1 02:13:04.367: NAT: s=1.1.1.3, d=10.10.10.10->1.1.1.2 [162]
*Mar 1 02:13:04.391: NAT: s=1.1.1.2->10.10.10.10, d=1.1.1.3 [162]
*Mar 1 02:13:04.391: NAT: s=10.10.10.10, d=1.1.1.3->1.1.1.1 [162]
*Mar 1 02:13:04.419: NAT: s=1.1.1.1->1.1.1.3, d=10.10.10.10 [163]
*Mar 1 02:13:04.419: NAT: s=1.1.1.3, d=10.10.10.10->1.1.1.2 [163]
*Mar 1 02:13:04.439: NAT: s=1.1.1.2->10.10.10.10, d=1.1.1.3 [163]
*Mar 1 02:13:04.439: NAT: s=10.10.10.10, d=1.1.1.3->1.1.1.1 [163]
*Mar 1 02:13:04.459: NAT: s=1.1.1.1->1.1.1.3, d=10.10.10.10 [164]
*Mar 1 02:13:04.459: NAT: s=1.1.1.3, d=10.10.10.10->1.1.1.2 [164]
*Mar 1 02:13:04.479: NAT: s=1.1.1.2->10.10.10.10, d=1.1.1.3 [164]
*Mar 1 02:13:04.479: NAT: s=10.10.10.10, d=1.1.1.3->1.1.1.1 [164]

R2:
interface FastEthernet0/0
ip address 1.1.1.3 255.255.255.0
ip nat enable
ip local-proxy-arp

спс