Internal lan hosts 
172.16.0.0 /16
172.18.0.0 /16

Inside hrsp vip - 10.254.28.161/28
Outside hrsp vip -200.0.0.1/28


Rtr1
-----
gig0/0/1 -inside interface - 10.254.28.162/28
gig0/0/1 -inside hrsp VIP - 10.254.28.161/28

gig0/0/2 -outside interface - 200.0.0.2/248
gig0/0/2 -outside hrsp VIP - 200.0.0.1/248

gig0/0/3 -Control link for B2B nat  - 10.1.12.1/30


interface GigabitEthernet0/0/1
Description - Inside_LAN
ip address 10.254.28.162 255.255.255.0
ip nat inside
redundancy rii 100
redundancy group 1 ip 10.254.28.161 exclusive decrement 100

interface GigabitEthernet0/0/2
Description - Outside_LAN 
ip address 200.0.0.2 255.255.255.248
ip nat outside
redundancy rii 200
redundancy group 1 ip 200.200.200.1 exclusive decrement 100

interface GigabitEthernet0/0/3
Description - B2B- Nat Control link 
ip address 10.1.12.1 255.255.255.252

track 1 interface GigabitEthernet0/0/1 line-protocol
track 2 interface GigabitEthernet0/0/2 line-protocol
track 3 list boolean and
object 1
object 2


Redundancy
application redundancy
group 1
name B2B-HA-NAT
preempt
priority 200
control GigabitEthernet0/0/3 protocol 1
data GigabitEthernet0/0/3
asymmetric-routing interface GigabitEthernet0/0/3
asymmetric-routing always-divert enable
track 3 decrement 100

ip access-list extended NAT
permit ip 172.16.0.0 0.0.255.255 any
permit ip 172.18.0.0 0.0.255.255 any

ip nat pool B2B-NAT 200.0.0.1 200.0.0.1 netmask 255.255.255.248
ip nat inside source list NAT pool B2B-NAT redundancy 1 mapping-id 10



Rtr2
----
gig0/0/1 -inside interface - 10.254.28.163/28
gig0/0/1 -inside hrsp VIP - 10.254.28.161/28

gig0/0/2 -outside interface - 200.0.0.3/248
gig0/0/2 -outside hrsp VIP - 200.0.0.1/248

gig0/0/3 -Control link for B2B nat  - 10.1.12.2/30


interface GigabitEthernet0/0/1
Description - Inside_LAN
ip address 10.254.28.163 255.255.255.0
ip nat inside
redundancy rii 100
redundancy group 1 ip 10.254.28.161 exclusive decrement 100

interface GigabitEthernet0/0/2
Description - Outside_LAN 
ip address 200.0.0.3 255.255.255.248
ip nat outside
redundancy rii 200
redundancy group 1 ip 200.0.0.1 exclusive decrement 100

interface GigabitEthernet0/0/3
Description - B2B- Nat Control link 
ip address 10.1.12.2 255.255.255.252

track 1 interface GigabitEthernet0/0/1 line-protocol
track 2 interface GigabitEthernet0/0/2 line-protocol
track 3 list boolean and
object 1
object 2

Redundancy
application redundancy
group 1
name B2B-HA-NAT
preempt
priority 150
control GigabitEthernet0/0/3 protocol 1
data GigabitEthernet0/0/3
asymmetric-routing interface GigabitEthernet0/0/3
asymmetric-routing always-divert enable
track 3 decrement 100

ip access-list extended NAT
permit ip 172.16.0.0 0.0.255.255 any
permit ip 172.18.0.0 0.0.255.255 any

ip nat pool B2B-NAT 200.0.0.1 200.0.0.1 netmask 255.255.255.248
ip nat inside source list NAT pool B2B-NAT redundancy 1 mapping-id 10