I have R4 connected to R1 over a point to point serial link (Outside). IP addressing is 172.16.1.0/29 - .1 is on R1 and .2 is on R4. R4 has a loopback 220.127.116.11 (Inside). R1 is on a LAN with R2 and R3. The network is 192.168.1.0/24 .1 on R1, .2 on R2 and .3 on R3. There is full reachability from anywhere to anywhere.
What I want is this.
1. R4 should never NAT if 18.104.22.168 pings R3 and vice versa.
2. R4 should always NAT if 22.214.171.124 pings R2 and vice versa. The NAT address should be 172.16.1.3 (outside) always.
3. R2 should always be able to reach 126.96.36.199 by pinging 172.16.1.3
Configuring a static entry solves issues 2 and 3 but breaks issue 1.
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