Carrier-Grade NAT (CG-NAT) is a solution used by ISPs to extend IPv4 address space by allowing multiple customers to share a single public IP address. MikroTik routers provide robust support for CG-NAT using the 100.64.0.0/16 prefix, a reserved address range specifically designated for shared address space.
In this article, we will discuss the best practices for implementing CG-NAT in MikroTik using the 100.64.0.0/16 prefix effectively.
Why Use CG-NAT?
With the depletion of IPv4 addresses, ISPs and network administrators must find ways to optimize address allocation. CG-NAT helps by:
- Enabling large-scale NAT (LSN) to serve multiple customers.
- Allowing smooth transition to IPv6 without immediate IPv4 exhaustion.
- Reducing public IPv4 address consumption.
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