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Firewalls authenticate vpn connections using pptp, L2tp or more commonly these days IPSec. &nbsp;You then setup usernames according to which authentication you deploy.
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Firewalls authenticate vpn connections using pptp, L2tp or more commonly these days IPSec.  You then setup usernames according to which authentication you deploy.

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Agree though Authentication can be carried out by RADIUS where usernames etc are stored in a directory (or database) elsewhere
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Agree though Authentication can be carried out by RADIUS where usernames etc are stored in a directory (or database) elsewhere

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PPTP and L2TP use PPP to authenticate user. Username and Password are encypted using CHAP, MS-CHAP, MS-CHAP v2, or send in cleartext with PAP. It happens in PPP transaction.
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PPTP and L2TP use PPP to authenticate user. Username and Password are encypted using CHAP, MS-CHAP, MS-CHAP v2, or send in cleartext with PAP. It happens in PPP transaction.

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Dear Mr/Ms<br />
I read in Buiding a VPN of Dave Koisur, ISBN 0471265264, I know that Firewall have strong authentication, but I don't know how it authenticate user? Is it store user Database somewhere? What protocol does it use to authenticate user? PPP or something? <br />
Thanks in advance
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Dear Mr/Ms
I read in Buiding a VPN of Dave Koisur, ISBN 0471265264, I know that Firewall have strong authentication, but I don't know how it authenticate user? Is it store user Database somewhere? What protocol does it use to authenticate user? PPP or something? 
Thanks in advance

How Firewall authenticate user?

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.