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ProSecure Web/Email Security Threat Management (STM) Appliance Reference Manual
Performing Network and System Management 3-5
v1.0, September 2009
3. Click Apply to save your settings. Changing the network settings has the following
consequences:
• Changing any of the settings in the Management Interface Settings section of the screen
causes the STM to restart.
• Changing any of the settings in the Interface Speed & Duplex Settings section of the
screen causes the network to restart.
• Changing the MTU setting causes services such as HTTP and SMTP to restart.
If you click Reset, the STM restarts to restore the default network settings.
Configuring Session Limits and Timeouts
The Session Limits screen allows you to specify the total number of sessions per user (that is, per
IP address or single source machine) that are allowed on the STM. Session limiting is disabled by
default. When session limiting is enabled, you can specify the maximum number of sessions per
user either as an absolute number or as a percentage of the STM’s total connection capacity per
user, which is 10000 sessions. (You cannot change the total connection capacity per user.) If a user
exceeds the number of allocated sessions, packets might be dropped.
To configure session limits and timeouts:
1. Select Global Settings > Network Settings from the menu. The Network Settings submenu
tabs appear with the Network Settings screen in view.
MTU Settings
Maximum
Transmission
Unit
The maximum transmission unit (MTU) is the largest physical packet size that a
network can transmit. Packets that are larger than the MTU value are divided into
smaller packets before they are sent, an action that prolongs the transmission
process. For most Ethernet networks the MTU value is 1500 Bytes, which is the
default setting.
Note: NETGEAR recommends synchronizing the STM’s MTU setting with that of
your network to prevent delays in transmission.
Note: Some protocols such as FTP and RSTP create two sessions per connection.
Table 3-1. Network Settings (continued)
Setting Description (or Subfield and Description)