Bizfon 2000 Guida Utente

Bizfon Manual II: Administrator's Guide  

Administrator’s Menus 

Bizfon2000 and Bizfon4000 (SW Version 4.1.x) 

 

 

Advanced Firewall Settings are used to deny Ping and 
Portscanning operations addressed towards the device. With 
these features enabled, Bizfon will answer with inscrutable 
messages to the Ping and Portscanning operations.  

 Operations are available only when the firewall is 

enabled from the 

 page. 

This  page offers the following components: 

The  Ping Stealth checkbox selection prohibits a Ping 
operation toward Bizfon from its WAN.  

The  Fool Portscanner checkbox selection prohibits Bizfon 
portscanning from its WAN. As a reply to a Portscanning 
operation, "network   unreachable" or "host unreachable" 
feedback messages will be sent. 

 

Fig. II-158: Advanced Firewall Settings page 

 

The Filtering Rules page allows you to configure the filters for incoming and outgoing traffic.  

To prevent inaccurate configuration, only one rule per service is allowed. The user may use IP groups to include several IP addresses for this rule. 
Since the filtering rules specify the operation mode of the firewall, they only take effect if the firewall has been enabled (additionally NAT should be 
enabled to use the Port Forwarding function in the Incoming Traffic / Port Forwarding filtering rules). The filtering rules are independent from the 
security level, so they will work if enabled, no matter what security level has been selected. 

 Applying firewall rules will prevent the establishment of new connections that violate the rules. Applying rules does not kill existing 

connections that violate the rule. 

View All displays all configured filters specified by their State 
(enabled or disabled), the selected Service, the set Action 
(allowed or blocked), the IP addresses the filters apply to (if 
Restricted) and the destination of port forwarding (Redirect to, 
in case of Incoming Traffic/Port Forwarding). Since it is read-
only, no modifications are allowed and no functional buttons are 
available.  

The  Incoming Traffic/Port Forwarding filter is for incoming 
traffic. The rules here allow or deny systems on the Internet to 
reach the services of Bizfon’s LAN. The NAT service should be 
enabled on the Bizfon to provide the possibility of Port 
Forwarding in the Incoming Traffic/Port Forwarding filtering 
rules. The Port Forwarding function will be unavailable if NAT is 
disabled on the Bizfon. 

 

The Outgoing Traffic filter is for outgoing traffic. The rules here 
allow or deny Bizfon’s LAN users to reach external services. 

Management Access is used to enable management access to 
the Bizfon from the Internet. A host on the Internet can be allowed 
to reach the Bizfon. 

Fig. II-159: Filtering Rules page 

SIP Access is to allow or deny the SIP access to or from the particular SIP servers, SIP hosts or a group of them. The SIP Access filtering rule may 
prevent or allow incoming or outgoing SIP calls to or from specified SIP server(s) or host(s). 

When Blocked IP List is used, traffic from specific hosts may be blocked, no matter what services are opened in the other filters. NO traffic will be 
allowed to the specified hosts. The Blocked IP List service has a higher priority if the same host is also listed in the Allowed IP List table. 

Allowed IP List allows trusted hosts to reach your network and vice versa. It is an exception to other rules and only all services may be allowed for a 
single host.  

Restricted IPSec - Generally hosts in a VPN are allowed to have access to any service, i.e., no traffic will be blocked. They are treated as if they 
were part of the Bizfon LAN. However, this service can be manually denied here. 

 

The  Filtering Rules page provides several links. Each link opens its specific parameters on the same page. Only Change Policy (see chapter 

), Manage user Defined Services (see chapter 

) and Manage IP Pool Groups (see chapter 

) lead to separate 

pages. The Filtering Rules page also includes the currently selected firewall security (Policy) level and its description. 

The table displayed on the bottom of this page shows the filters selected above, specified by their State (enabled or disabled), the selected Service, 
the set Action (allowed or blocked), the IP addresses the filters apply to (if Restricted) and the destination of port forwarding (Redirect to, in case of 
Incoming Traffic/Port Forwarding). With the exception of View All, the table offers the following functional buttons: