User Manual

Outgoing blocked types: no types/several types
Reference: Configuration options
With a mouse click on the link a list of ICMP packet types is displayed. From this list
you can select the desired outgoing ICMP message types you want to block.
Flooding
With a mouse click on the link, a dialog box is displayed where you can enter the
maximum allowed ICMPA delay.
Fragmented ICMP packets
With a mouse click on the link, you have the choice to reject or not to reject
fragmented ICMP packets.
TCP port scan
With this rule, you can define when a TCP port scan is assumed by the FireWall and what
should be done in this case. This rule serves for preventing so-called TCP port scan
attacks that result in a detection of open TCP ports on your computer. This kind of attack is
used to search a computer for weak spots and is often followed by more dangerous attack
types.
Predefined rules for the TCP port scan
Setting Rules
Low Assume a TCP port scan if 50 or more ports were
scanned in 5,000 milliseconds.
When detected, log attacker's IP and don't add rule
to block the attack.
Medium Assume a TCP port scan if 50 or more ports were
scanned in 5,000 milliseconds.
When detected, log attacker's IP and add rule to
block the attack.
High Same rule as for medium level.
Ports
With a mouse click on the link a dialog box appears in which you can enter the number
of ports that must have been scanned so that a TCP port scan is assumed.
Port scan time window
With a mouse click on this link a dialog box appears in which you can enter the time
span for a certain number of port scans, so that a TCP port scan is assumed.
Avira Professional Security - User Manual (Status: 30 Mar. 2012) 146