One question asked frequently by those planning to implement virtual private networks concerns the ability to combine IP security (IPsec) and Network Address Translation (NAT). Many have heard rumors and war stories about incompatibilities between IPsec and NAT. Others have seen blanket denials issued by vendors who successfully combine IPsec and NAT within a single product. As is so often the case, reality lies somewhere between the two extremes: IPsec and NAT can be employed together in some configurations, but not in others. In today's column, we'll explore the issues and limitations associated with combining IPsec and NAT, and take a brief look at recent advances in this area.
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