User Manual Part 2
Table Of Contents
- Using SmartDefense
- Using Antivirus and Antispam Filtering
- Overview
- Using VStream Antivirus
- Using VStream Antispam
- How VStream Antispam Works
- Header Marking
- Default Antispam Policy
- Enabling/Disabling VStream Antispam
- Viewing VStream Antispam Statistics
- Configuring the Content Based Antispam Engine
- Configuring the Block List Engine
- Configuring the IP Reputation Engine
- Configuring the VStream Antispam Policy
- Configuring the Safe Sender List
- Configuring VStream Antispam Advanced Settings
- Using Centralized Email Filtering
- Using Web Content Filtering
- Updating the Firmware
- Using Subscription Services
- Working With VPNs
- Overview
- Setting Up Your Safe@Office Appliance as a VPN Server
- Adding and Editing VPN Sites
- Viewing and Deleting VPN Sites
- Enabling/Disabling a VPN Site
- Logging in to a Remote Access VPN Site
- Logging Out of a Remote Access VPN Site
- Using Certificates
- Viewing VPN Tunnels
- Viewing IKE Traces for VPN Connections
- Viewing VPN Topology
- Managing Users
- Using Remote Desktop
- Controlling the Appliance via the Command Line
- Maintenance
- Viewing Firmware Status
- Upgrading Your Software Product
- Configuring a Gateway Hostname
- Configuring Syslog Logging
- Configuring HTTPS
- Configuring SNMP
- Setting the Time on the Appliance
- Using Diagnostic Tools
- Backing Up and Restoring the Safe@Office Appliance Configuration
- Using Rapid Deployment
- Resetting the Safe@Office Appliance to Defaults
- Running Diagnostics
- Rebooting the Safe@Office Appliance
- Using Network Printers
- Troubleshooting
- Specifications
- Glossary of Terms
- Index
SmartDefense Categories
Chapter 14: Using SmartDefense 439
Table 83: Small PMTU Fields
In this field… Do this…
Action
Specify what action to take when a packet is smaller than the Minimal MTU
Size threshold, by selecting one of the following:
• Block. Block the packet.
• None. No action. This is the default.
Track
Specify whether to issue logs for packets are smaller than the Minimal MTU
Size threshold, by selecting one of the following:
• Log. Issue logs. This is the default.
• None. Do not issue logs.
Minimal MTU
Size
Type the minimum value allowed for the MTU field in IP packets sent by a
client.
An overly small value will not prevent an attack, while an overly large value
might degrade performance and cause legitimate requests to be dropped.
The default value is 300.