NAT
SNAT (Source NAT) and DNAT (Destination NAT)
SNAT, as name suggests, is a technique that translates source IP address generally when connecting from private IP address to public IP address. It maps source client IP address in a request to a translation defined on BIG-IP device. It is most common form of NAT that is used when internal host needs to initiate session to an external host or public host.
DNAT, as name suggests, is a technique that translates destination IP address generally when connecting from public IP address to private IP address. It is generally used to redirect packets destined for specific IP address or specific port on IP address, on one host simply to a different address mostly on different host.
Reference
- https://en.wikipedia.org/wiki/Network_address_translation
- https://learn.microsoft.com/en-us/azure/load-balancer/load-balancer-outbound-connections
- https://techdocs.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/tmos-routing-administration-11-6-0/7.html
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