Dynamips is a Cisco IOS emulator.  Dynagen is a way to wire-up your routers to make a fully-capable network.  It's most common use is for lab-work.  You can use it to help with your studies or test out features and configurations before deploying them into your production network.  Many people prefer GNS3 as a graphical front-end to Dynagen.  However, for me, the...
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