In this post I am going to show you how to configure crypto keypair without configuring host name or domain name on Cisco devices. A few network admins still have some confusion about if configuring the domain name on Cisco devices is a requirement to generate a crypto keypair or not. I believe this confusion comes from the error we get when we try to create a crypto keypair on Cisco devices before we’ve configured the domain name. The error would explicitly ask us to define the domain name first to generate the crypto keypair.

In this post I’m going to talk about NAT exemption. As we know NAT plays a very important role in our networks today, however, with all the benefits we get from NAT’ing, sometimes we don’t need it, or more specifically we need to bypass it. A common case scenario would be for VPN traffic where we don’t want to translate the original IP addresses. In this post I’m going to show you how to exempt NAT by applying a tricky configuration on IOS without having to go through the common way of doing it.

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