Fortinet Complete Guide to FortiGate L2TP VPN User Authentication

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VPN authentication

Configuring authenticated access

4Enter Starting IP and Ending IP addresses. This defines the range of addresses assigned to VPN clients.

5Select the user group that is to have access to this VPN. The FortiGate unit authenticates members of this user group.

6Select Apply.

To configure authentication for a PPTP VPN - CLI

config vpn pptp

set eip <starting_ip> set sip <ending_ip> set status enable

set usrgrp <user_group_name> end

You also need to define a firewall policy that permits packets to pass from VPN clients with addresses in the specified range to IP addresses that the VPN clients need to access on the private network behind the FortiGate unit. The Action for this firewall policy is ACCEPT, not ENCRYPT, because the allowed user group is defined in the PPTP VPN configuration, not in the firewall policy.

For detailed information about configuring PPTP, see the FortiGate PPTP VPN User Guide.

Configuring authentication of L2TP VPN users/user groups

Authentication of a FortiGate L2TP configuration must be done using the config vpn l2tp CLI command.

To configure authentication for an L2TP VPN - CLI

config vpn l2tp

set eip <starting_ip> set sip <ending_ip> set status enable

set usrgrp <user_group_name> end

For more information, see the FortiGate CLI Reference.

Configuring authentication of remote IPSec VPN users

An IPSec VPN on a FortiGate unit can authenticate remote users through a dialup group. The user account name is the peer ID and the password is the pre-shared key. For information about authentication using peer IDs and peer groups, see the FortiGate IPSec VPN User Guide.

Authentication through user groups is supported for groups containing only local users. To authenticate users using a RADIUS or LDAP server, you must configure XAUTH settings. See “Configuring XAuth authentication” on page 58.

To configure user group authentication for dialup IPSec - web-based manager

1Configure the dialup users who are permitted to use this VPN. Create a user group with Type:Firewall and add them to it.

For more information, see “Users/peers and user groups” on page 33.

	FortiOS v3.0 MR7 User Authentication User Guide
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Contents E R G U I D E FortiOS v3.0 MR7 User Authentication User Guide TrademarksContents Configuring authenticated access Users/peers and user groupsIndex Creating local users Creating peer usersAbout authentication IntroductionVPN client-based authentication User’s view of authenticationWeb-based user authentication FortiGate administrator’s view of authentication See Creating local users on See Creating peer users onAuthentication servers See Configuring user groups onPublic Key Infrastructure PKI authentication PeersUsers User groupsAuthentication timeout About this documentFirewall policies VPN tunnelsTypographic conventions Name field, type adminFortiGate documentation FortiGate Administration Guide Related documentationFortiManager documentation FortiClient documentationFortiMail documentation FortiAnalyzer documentationCustomer service and technical support Fortinet Tools and Documentation CDFortinet Knowledge Center Comments on Fortinet technical documentationAuthentication servers Radius serversConfiguring the FortiGate unit to use a Radius server Radius attributes sent in Radius accounting messagePrimary Server Name/IP Primary Server SecretEdit icon Edit a Radius server configuration GroupLdap servers Ldapsearch -x objectclass= Configuring the FortiGate unit to use an Ldap server Password Server PortCommon Name IdentifierTo configure the FortiGate unit for Ldap authentication CLI EditProtocol CertificateUsing the Query icon Ldap server Distinguished Name Query treeTACACS+ servers AsciiAuthentication Type Server KeyDirectory Service servers Create New DomainGroups Fsae Collector IPDirectory Service server configuration Name Fsae Collector IP/Name PortCLI Example Directory Service server list Directory Service servers Users/peers and user groups Users/peersTo create a local user web-based manager Go to User Local User type AuthenticationCreating local users To create a local user CLI To view a list of all local users, go to User LocalDelete icon Edit icon Delete icon To remove a user from the FortiGate unit configuration CLICreating peer users Subject Authenticating peer userTo view a list of PKI peer users, go to User PKI To create a peer user for PKI authentication CLI Remove PKI peer userFirewall user groups Directory Service user groupsUser groups SSL VPN user groups Protection profilesFirewall Configuring user groupsSelect Create New and enter the following information Configuring Directory Service user groups To create a firewall user group CLIMembers FortiGuard WebConfiguring SSL VPN user groups Available Users/Groups or Available MembersConfiguring Peer user groups Viewing a list of user groupsTo create a peer group CLI Group NameConfig user group delete groupname End User groups Authentication timeout Authentication protocolsEnter the Idle Timeout value seconds Select Apply TelnetFirewall policy authentication Authentication SettingsConfiguring authentication for a firewall policy Authentication is an Advanced firewall optionTo configure authentication for a firewall policy Go to Firewall PolicyFirewall policy order Firewall Policy Move ToZone Configuring authenticated access to the InternetSource Interface VPN authentication Configuring authentication of SSL VPN usersSelect Enable SSL-VPN and enter information as follows Go to VPN SSLDefault RC4128 Server CertificateRequire Client Certificate Encryption Key AlgorithmTo configure authentication for an SSL VPN CLI Configuring authentication of VPN peers and clients Configuring authentication of Pptp VPN users/user groupsSelect Enable Pptp Select Require Client Certificate, and then select ApplyConfiguring authentication of L2TP VPN users/user groups Configuring authentication of remote IPSec VPN usersTo configure authentication for a Pptp VPN CLI To configure authentication for an L2TP VPN CLIRemote Gateway To configure user group authentication for dialup IPSec CLIOnly users with passwords on the FortiGate unit Configuring XAuth authentication IPSec configuration for dialup usersTo configure authentication for a dialup IPSec VPN CLI Remote Gateway Authentication MethodXAuth Server TypeVPN authentication Index 01-30007-0347-20080731 MS-CHAP VSA