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Reference: Cisco: Internetworking Basics

If you read the article (Cannot find the "crypt" command in Linux) and installed the Crypt command, you will notice that this may not work with Red Hat 8.0 and higher.

There are two environment variables that I needed to set (actually override) to make the crypt command work:

export LANG=en_US export SUPPORTED=en_US:en

After setting these two environment settings in your session should fix the problem.

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