We will use ip nat inside destination command to split up the load from what looks one global destination , to several inside hosts. This is similar like server load balancing, at least without all the health checks.
Below is our topology:
Using only two links just to show the flexibility of this configuration.
We have static default routes from R1, R2, and R3 pointing to R4.
Below is the R4 configuration:
interface FastEthernet0/0
ip address 192.168.0.4 255.255.255.0
ip nat inside
ip virtual-reassembly
!
interface Serial1/0
ip address 192.168.45.4 255.255.255.0
ip verify unicast reverse-path
ip nat outside
ip virtual-reassembly
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.46.4 255.255.255.0
ip verify unicast reverse-path
ip nat outside
ip virtual-reassembly
!
ip route 0.0.0.0 0.0.0.0 192.168.45.5
ip route 0.0.0.0 0.0.0.0 192.168.46.6
!
ip nat pool POOL 192.168.0.1 192.168.0.3 prefix-length 24 type rotary
ip nat inside destination list 10 pool POOL
!
access-list 10 permit 192.168.45.10
access-list 10 permit 192.168.46.10Verifying from R7:
R7#telnet 192.168.45.10
Trying 192.168.45.10 ... Open
R1>
R1>exit
[Connection to 192.168.45.10 closed by foreign host]
R7#telnet 192.168.45.10
Trying 192.168.45.10 ... Open
R2>exit
[Connection to 192.168.45.10 closed by foreign host]
R7#telnet 192.168.45.10
Trying 192.168.45.10 ... Open
R3>exit
[Connection to 192.168.45.10 closed by foreign host]
R7#telnet 192.168.46.10
Trying 192.168.46.10 ... Open
R1>exit
[Connection to 192.168.46.10 closed by foreign host]
R7#telnet 192.168.46.10
Trying 192.168.46.10 ... Open
R2>exit
[Connection to 192.168.46.10 closed by foreign host]
R7#NAT table on R4:
R4#sho ip nat translations
Pro Inside global Inside local Outside local Outside global
tcp 192.168.45.10:23 192.168.0.1:23 200.0.0.7:51519 200.0.0.7:51519
tcp 192.168.46.10:23 192.168.0.1:23 200.0.0.7:64139 200.0.0.7:64139
tcp 192.168.46.10:23 192.168.0.2:23 200.0.0.7:11691 200.0.0.7:11691
tcp 192.168.45.10:23 192.168.0.2:23 200.0.0.7:62913 200.0.0.7:62913
tcp 192.168.45.10:23 192.168.0.3:23 200.0.0.7:17295 200.0.0.7:17295
Thanks for reading blog ……….