What kind of firewall is the ZyWALL?
The ZyWALL’s firewall inspects packets contents and IP headers. It is applicable to all protocols, that understands data in the packet is intended for other layers, from network layer up to the application layer. The ZyWALL’s firewall performs stateful inspection. It takes into account the state of connections it handles so that, for example, a legitimate incoming packet can be matched with the outbound request for that packet and allowed in. Conversely, an incoming packet masquerading as a response to a nonexistent outbound request can be blocked. The ZyWALL’s firewall uses session filtering, i.e., smart rules, that enhance the filtering process and control the network session rather than control individual packets in a session. The ZyWALL’s firewall is fast. It uses a hashing function to search the matched session cache instead of going through every individual rule for a packet. The ZyWALL’s firewall provides email service to notify you for routine reports and when alerts occur.
