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Sorry for a dump question. I am able to ping printer in my company with following shell:

ping print226

Question: How does router solve this since it doesn't have domain name? Will it work for whole VPN or just it applies to my physical network?

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    You are pinging a hostname so this will be resolved to an IP address. So when you are connected to your VPN, your interface will be configured to use a DNS server to resolve any names to IP. If a record exists on this DNS server for print226, and there is a route to the device, you can ping it. Hope this helps, – SleepyMan Jul 1 '16 at 8:43
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How does router solve this since it doesn't have domain name?

Since you're pinging the printer in the LAN, DNS lookup is performed for the local domain.

Will it work for whole VPN or just it applies to my physical network?

It depends on how your VPN is configured, but normally, yes. A VPN allows you to connect to an internal network just like you're physically there.

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