Netgear FVS318N – Prosafe Wireless N VPN Firewall 参考手册

Click Apply to save your settings.

The application level gateway (ALG) facilitates multimedia sessions such as voice over IP 
(VoIP) sessions that use the Session Initiation Protocol (SIP) across the firewall and provides 
support for multiple SIP clients. SIP support for the ALG, which is an IPv4 feature, is disabled 
by default. 



Select Security > Firewall > Advanced. The Advanced screen displays:

Select the Enable SIP ALG check box.

Click Apply to save your settings.

User Limit

Enter a number to indicate the user limit. Note the following:

•

If the User Limit Parameter is set to Percentage of Max Sessions, the number 
specifies the maximum number of sessions that are allowed from a 
single-source device as a percentage of the total session connection capacity 
of the wireless VPN firewall. (The session limit is per-device based.) 

•

If the User Limit Parameter is set to Number of Sessions, the number specifies 
an absolute value.

Some protocols such as FTP and RSTP create two sessions per connection, 

which should be considered when you configure a session limit.

Total Number of 
Packets Dropped due 
to Session Limit

This is a nonconfigurable counter that displays the total number of dropped packets 
when the session limit is reached.

TCP Timeout

For each protocol, specify a time-out in seconds. A session expires if no data for 
the session is received during the time-out period. The default time-out periods are 
1800 seconds for TCP sessions, 120 seconds for UDP sessions, and 60

 seconds 

for ICMP sessions.

UDP Timeout

ICMP Timeout