Avaya Business Secure Router 222 Configuration - Basics Manual do Utilizador descarregar pdf (Página 164)

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164 Chapter 10 Firewalls

NN47922-500

In summary, stateful inspection:

• Allows all sessions originating from the LAN (local network) to the WAN

(Internet).

• Denies all sessions originating from the WAN to the LAN.

Figure 50 Stateful inspection

Figure 50 shows the Business Secure Router’s default firewall rules in action, and

demonstrates how stateful inspection works. User A can initiate a Telnet session

from within the LAN and responses to this request are allowed. However, other

Telnet traffic initiated from the WAN is blocked.

Stateful inspection process

In the following example, the following sequence of events occurs when a TCP

packet leaves the LAN network through the firewall's WAN interface. The TCP

packet is the first in a session, and the packet's application layer protocol is

configured for a firewall rule inspection:

1 The packet travels from the firewall's LAN to the WAN.

2 The packet is evaluated against the interface's existing outbound access list,

and the packet is permitted (a denied packet is dropped at this point).

Business Secure Router

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