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Why Not NAT• Exhaustion of address space• NAT breaks the end-to-end model• Growth of NAT has slowed down growth oftransparent applications• No easy way to maintain states of NAT in case ofnode failures• NAT break security• NAT complicates mergers, double NATing isneeded for devices to communicate with each otherRST-130012394_04_2006_c2© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public8