NETGEAR UTM25-100NAS Managing the Application Level Gateway for SIP Sessions, Session Timeout

ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual

Table 5-5. Session Limit Settings

Setting	Description (or Subfield and Description)
Session Limit
User Limit Parameter	From the User Limit Parameter pull-down menu, select one of the following
	options:
	• Percentage of Max Sessions. A percentage of the total session connection
	capacity of the UTM.
	• Number of Sessions. An absolute number of maximum sessions.
User Limit	Enter a number to indicate the user limit.
	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
	UTM. (The session limit is per-device based.)
	If the User Limit Parameter is set to Number of Sessions, the number specifies
	an absolute value.
	Note: Some protocols such as FTP and RSTP create two sessions per
	connection, which should be considered when configuring a session limit.
Total Number of	This is a non-configurable counter that displays the total number of dropped
Packets Dropped due	packets when the session limit is reached.
to Session Limit
Session Timeout
TCP Timeout	For each protocol, specify a timeout in seconds. A session expires if no data for
	the session is received for the duration of the timeout period. The default
UDP Timeout
	timeout periods are 1200 seconds for TCP sessions, 180 seconds for UDP
ICMP Timeout
	sessions, and 8 seconds for ICMP sessions.

5.Click Apply to save your settings.

Managing the Application Level Gateway for SIP Sessions

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. ALG support for SIP is disabled by default.

To enable ALG for SIP:

1.Select Network Security > Firewall from the menu. The Firewall submenu tabs appear.

2.Click the Advanced submenu tab. The Advanced screen displays (see Figure 5-13 on page 5-25).

5-24 Firewall Protection

v1.0, September 2009