Secure Computing SG550 Uživatelský manuál stáhnout pdf (Strana 155)

Firewall

151

Enter an arbitrary Description of service, the Name or IP address of the computer

hosting this service on your network, the External Port number for this service and

the Internal Port number for this service. Select whether the service uses the TCP or

UDP protocol. Click OK.

This rule now appears on the SG unit UPnP page, under Current UPnP Port Mappings.

Connection Tracking

Connection tracking keeps a record of what packets have passed through the unit, and

how they relate to each other. A sequence of related packets is called a connection.

This is required for stateful packet filtering and network address translation (NAT).

Most packets are correctly handled by generic support for protocols such as TCP and

UDP. However, some protocols are more complicated and require specific connection

tracking modules in order to record the state correctly. For example, FTP requires

additional connections for data transfer, and also transmits IP addresses and ports within

the data portion of packets.

Configuring connection tracking

You can select which connection tracking modules are used by checking the Enabled

option. Since connection tracking modules can allow additional connections through the

firewall, you should disable modules that you do not need.

1 2 ... 150 151 152 153 154 155 156 157 158 159 160 ... 296 297

Žádné komentáře

Secure Computing SG550 Uživatelský manuál Strana 155