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Configuring System Information
EdgeSwitch
™
Administration Guide
Ubiquiti Networks, Inc.
Denial of Service Configuration Fields (Continued)
Field
Description
SMAC=DMAC
When selected, this option allows the device to drop packets that have a source MAC address equal to
the destination MAC address.
TCP FIN and URG and PSH
When selected, this option allows the device to drop packets that have TCP Flags FIN, URG, and PSH
set and a TCP Sequence Number equal to 0.
TCP Flag and Sequence
When selected, this option allows the device to drop packets that have TCP control flags set to 0 and
the TCP sequence number set to 0.
TCP SYN
When selected, this option allows the device to drop packets that have TCP Flags SYN set.
TCP SYN and FIN
When selected, this option allows the device to drop packets that have TCP Flags SYN and FIN set.
TCP Fragment
When selected, this option allows the device to drop packets that have a TCP payload where the IP
payload length minus the IP header size is less than the minimum allowed TCP header size.
TCP Offset
When selected, this option allows the device to drop packets that have a TCP header Offset set to 1.
Min TCP Hdr Size
The minimum TCP header size allowed. If First Fragment DoS prevention is enabled, the device will
drop packets that have a TCP header smaller than this configured value.
ICMP Settings
– These options help prevent the device and the network from attacks that involve issues with the ICMP echo request
packets (pings) that the device receives.
ICMP
Enable this option to allow the device to drop ICMP packets that have a type set to ECHO_REQ (ping)
and a payload size greater than the ICMP payload size configured in the
Max ICMPv4 Size
field.
Max ICMPv4 Size
The maximum allowed ICMPv4 packet size. If ICMP DoS prevention is enabled, the device will drop
ICMPv4 ping packets that have a size greater then this configured maximum ICMPv4 packet size.
ICMPv6
Enable this option to allow the device to drop ICMP packets that have a type set to ECHO_REQ (ping)
and a payload size greater than the ICMP payload size configured in the
Max ICMPv6 Size
field.
Max ICMPv6 Size
The maximum allowed IPv6 ICMP packet size. If ICMP DoS prevention is enabled, the switch will drop
IPv6 ICMP ping packets that have a size greater than this configured maximum ICMPv6 packet size.
ICMP Fragment
Enable this option to allow the device to drop fragmented ICMP packets.
Use the buttons to perform the following tasks:
• If you change any of the DoS settings, click
Submit
to apply the changes to the running configuration.
• Click
Refresh
to refresh the page with the most current data from the switch.
To retain the changes across the switch’s next power cycle, click
System
>
Configuration Storage
>
Save
.