-This is Feature give us translation more than one network address which mean Back up nat to the active failure.
- Nat is great feature help us to permit the interconnection of private network to reach the Public network.
- SNAT work as active and back up scenario the active handle the traffic require translation ip address from Private to public.
- Back up SNAT is working as duplication all the translation which in the active table and once the active translator is down the back up will handle the translation and will replay to all requests.
- There is Two phases of the SNAT , phase one was not supported for the application level,
Phase two is provide the application level and asymmetric routing [ Encryption method use two Keys to encrypt the plain text secret key is change over the internet] recommend to read one fully article about the asymmetric & symmetric.
-The mapping-id must be the same between them
-Redundancy string must match the standby name. Example for the SNAT configuration :
Interface Gig 0/0/0
Standby 10 name SNAT-DC
standby 10 ip address 10.100.101.254
ip nat inside
interface Gig 0/0/1
Ip nat outside
IP nat stateful id 10
10 permit 10.100.101.0 0.0.0.255
Ip nat pool SNAT-POOL 184.108.40.206 220.127.116.11 prefix-length 24
Ip nat inside source list nat pool SNAT-POOL mapping-id 90 overload
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