Relationship between the VPN and firewalls

Briefly describe the relationship between the VPN and firewalls?

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As VPNs were accessible before firewalls through encrypting routers and modems, they came to general use running on or with the firewalls. Nowadays, most of the people would expect a firewall vendor to propose a VPN option. As well, they want it managed through the similar firewall management interface. However then, users nowadays seem to want nearly the whole thing on firewall: name server, mail server, proxy servers for HTTP, FTP server, directory server and so forth.

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