routing performance when NAT is enabled
Most of us have probably seen the Cisco Routing Performance document, which specifies the routing performance for Cisco router platforms tested with 64 byte packets and no additional features(encryption, ACL's, QoS etc) enabled. In practise, how much does NAT affect router routing performance? It's clear that this depends on the size of the NAT translations table, but are there some general rules? Anyone had performance issues because of (huge amount of) NAT translations?