Fortinet FortiGate FortiGate-400 Administration Manual page 9

L2TP .............................................................................................................................. 265
Setting up a L2TP-based VPN.................................................................................... 266
Enabling L2TP and specifying an L2TP range............................................................ 266
Configuring a Windows 2000 client for L2TP.............................................................. 267
Configuring a Windows XP client for L2TP ................................................................. 268
Certificates ...................................................................................................................... 270
Viewing the certificate list............................................................................................ 271
Generating a certificate request.................................................................................. 271
Installing a signed certificate ...................................................................................... 273
Enabling VPN access for specific certificate holders ................................................. 274
CLI configuration............................................................................................................. 275
ipsec phase1............................................................................................................... 275
ipsec phase2............................................................................................................... 277
ipsec vip ...................................................................................................................... 278
Authenticating peers with preshared keys ...................................................................... 280
Gateway-to-gateway VPN............................................................................................... 280
Dialup VPN ..................................................................................................................... 281
Dynamic DNS VPN ......................................................................................................... 281
Manual key IPSec VPN................................................................................................... 282
Adding firewall policies for IPSec VPN tunnels............................................................... 282
Setting the encryption policy direction ........................................................................ 282
Setting the source address for encrypted traffic ......................................................... 282
Setting the destination address for encrypted traffic................................................... 283
Adding an IPSec firewall encryption policy ................................................................. 283
Internet browsing through a VPN tunnel ......................................................................... 283
Configuring Internet browsing through a VPN tunnel.................................................. 284
IPSec VPN in Transparent mode.................................................................................... 285
Special rules ............................................................................................................... 285
Hub and spoke VPNs...................................................................................................... 286
Configuring the hub..................................................................................................... 286
Configuring spokes ..................................................................................................... 288
Redundant IPSec VPNs.................................................................................................. 289
Configuring redundant IPSec VPNs............................................................................ 289
Configuring IPSec virtual IP addresses .......................................................................... 290
Troubleshooting .............................................................................................................. 292
IPS ....................................................................................................................... 293
Signature......................................................................................................................... 294
Predefined................................................................................................................... 294
Custom........................................................................................................................ 298
Anomaly .......................................................................................................................... 300
Anomaly CLI configuration.......................................................................................... 303
Configuring IPS logging and alert email.......................................................................... 304
Default fail open setting .................................................................................................. 304
FortiGate-400 Administration Guide 01-28006-0006-20041105
Contents
9