Security
Denial of Service Prevention
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x 336
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ICMP Filtering
The ICMP Filtering page enables the blocking of ICMP packets from certain sources. This can
reduce the load on the network in case of an ICMP attack.
To define ICMP filtering:
STEP 1 Click Security > Denial of Service Prevention > ICMP Filtering.
STEP 2 Click Add.
STEP 3 Enter the parameters.
• Interface—Select the interface on which the ICMP filtering is being defined.
• IP Address—Enter the IPv4 address for which the ICMP packet filtering is activated
or select All Addresses to block ICMP packets from all source addresses. If you enter
the IP address, enter either the mask or prefix length.
• Network Mask—Select the format for the subnet mask for the source IP address, and
enter a value in one of the field:
- Mask—Select the subnet to which the source IP address belongs and enter the
subnet mask in dotted decimal format.
- Prefix Length—Select the Prefix Length and enter the number of bits that comprise
the source IP address prefix.
STEP 4 Click Apply. The ICMP filtering is defined, and the Running Configuration is updated.
IP Fragments Filtering
The IP Fragmented page enables blocking fragmented IP packets.
To configure fragmented IP blocking:
STEP 1 Click Security > Denial of Service Prevention > IP Fragments Filtering.
STEP 2 Click Add.
STEP 3 Enter the parameters.
• Interface—Select the interface on which the IP fragmentation is being defined.
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