Vigor3900 Series User’s Guide
218
Item Description
value.
Port Scan Threshold
The default threshold is
2000
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.
Apply
Click it to save the configuration.
Cancel
Click it to discard the settings configured in this page.
After finished the above settings, click
Apply
to save the configuration.
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