vercel dev does require an internet connection because vercel dev needs to:

• Authenticate with Vercel's services
• Fetch project configuration and environment variables from Vercel
• Simulate Vercel's Edge Network features
• Connect to Vercel's APIs for various integration

For offline testing, you can use their built-in development server instead:

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# For Next.js
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npm run dev
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# For other frameworks
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npm start
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# or
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yarn dev

You're telling me I need to authenticate before I can run a local server on my own computer? And then I need to fetch a project configuration from your server when there's already a vercel.json file on my computer?

Furthermore, how does "npm start" or "yarn dev" have anything to do with this?

Running the built in development server offline is precisely what I am trying to do

Sorry, but this answer doesn't make any sense