Recently I came across a command to reset Cisco C9000 switches to factory default. The command is factory-reset and it was introduced in IOS XE 16.8.1a. This command can be handy and harmful. It can be harmful if you use it without paying attention to what option you use with it.

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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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