IOS XE 3.6S was released recently introducing Carrier Grade NAT to ASR 1000 platform. CGN translates IPv4 addresses into IPv6 addresses and vice versa and is one of the most critical feature while world is slowly moving into IPv6 addressing. It can also be used for NAT44 (IPv4 private to IPv4 public) translation. What differs CGN from traditional NAT? CGN increases the scalability of the number of NAT translations that can be supported because destination information is not stored and works good with carrier services like broadband access aggregation (ie. PPPoE, DSL)
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