Introduction About FortiGate Antivirus Firewalls
FortiGate-4000 Administration Guide 01-28006-0012-20041105 17
VLANs and virtual domains
Fortigate Antivirus Firewalls support IEEE 802.1Q-compliant virtual LAN (VLAN) tags.
Using VLAN technology, a single FortiGate unit can provide security services to, and
control connections between, multiple security domains according to the VLAN IDs
added to VLAN packets. The FortiGate unit can recognize VLAN IDs and apply
security policies to secure network and IPSec VPN traffic between each security
domain. The FortiGate unit can also apply authentication, content filtering, and
antivirus protection to VLAN-tagged network and VPN traffic.
The FortiGate unit supports VLANs in NAT/Route and Transparent mode. In
NAT/Route mode, you enter VLAN subinterfaces to receive and send VLAN packets.
FortiGate virtual domains provide multiple logical firewalls and routers in a single
FortiGate unit. Using virtual domains, one FortiGate unit can provide exclusive firewall
and routing services to multiple networks so that traffic from each network is
effectively separated from every other network.
You can develop and manage interfaces, VLAN subinterfaces, zones, firewall policies,
routing, and VPN configuration for each virtual domain separately. For these
configuration settings, each virtual domain is functionally similar to a single FortiGate
unit. This separation simplifies configuration because you do not have to manage as
many routes or firewall policies at one time.
Intrusion Prevention System (IPS)
The FortiGate Intrusion Prevention System (IPS) combines signature and anomaly
based intrusion detection and prevention. The FortiGate unit can record suspicious
traffic in logs, can send alert email to system administrators, and can log, pass, drop,
reset, or clear suspicious packets or sessions. Both the IPS predefined signatures and
the IPS engine are upgradeable through the FortiProtect Distribution Network (FDN).
You can also create custom signatures.
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