Draytek Vigor3900 Series User Manual

Vigor3900 Series User’s Guide
145
Item Description
user-defined timeout period.
UDP Flood Threshold
The default setting for threshold is 300 packets per second.
UDP Flood Timeout
The default setting for timeout is 10 seconds.
Block Port Scan
Click Enable to activate the Port Scan detection function.
Port scan sends packets with different port numbers to find
available services, which respond. The router will identify it
and report a warning message if the port scanning rate in
packets per second exceeds the user-defined threshold value.
Port Scan Threshold
The default threshold is 300 pps (packets per second).
Block IP Options
Click Enable to activate the Block IP options function. The
router will ignore any IP packets with IP option field
appearing in the datagram header.
Block Land
Click Enable to activate the Block Land function. A Land
attack occurs when an attacker sends spoofed SYN packets
with identical source address, destination addresses and port
number as those of the victim.
Block SMURF
Click Enable to activate the Block Smurf function. The
router will reject any ICMP echo request destined for the
broadcast address.
Block Trace Route
Click Enable to activate the Block Trace Route function.
Block SYN Fragment
Click Enable to activate the Block SYN fragment function.
Any packets having the SYN flag and fragmented bit sets
will be dropped.
Block Fraggle
Click Enable to activate the Block fraggle Attack function.
Any broadcast UDP packets received from the Internet are
blocked.
Block Tear Drop
Click Enable to activate the Block Tear Drop function. This
attack involves the perpetrator sending overlapping packets
to the target hosts so that target host will hang once they
re-construct the packets. The routers will block any packets
resembling this attacking activity.
Block Ping of Death
Click Enable to activate the Block Ping of Death function.
Many machines may crash when receiving an ICMP
datagram that exceeds the maximum length. The router will
block any fragmented ICMP packets with a length greater
than 1024 octets.
Block ICMP Fragment
Click Enable to activate the Block ICMP fragment function.
Any ICMP packets with fragmented bit sets are dropped.
Block Unknown
Protocol
Click Enable to activate the Block Unknown Protocol
function. The router will block any packets with unknown
protocol types.
Refresh
Renew current web page.
Apply
Click it to save the configuration.

Draytek Vigor3900 Series Specifications

General

Brand	Draytek
Model	Vigor3900 Series
Category	Network Hardware
Language	English