Security
Denial of Service Prevention
335 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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• TCP Port—Select the destination TCP port being filtered:
- Known Ports—Select a port from the list.
- User Defined—Enter a port number.
- All Ports—Select to indicate that all ports are filtered.
STEP 4 Click Apply. The SYN filter is defined, and the Running Configuration file is updated.
SYN Rate Protection
The SYN Rate Protection page enables limiting the number of SYN packets received on the
ingress port. This can mitigate the effect of a SYN flood against servers, by rate limiting the
number of new connections opened to handle packets.
To define SYN rate protection:
STEP 1 Click Security > Denial of Service Prevention > SYN Rate Protection.
This page appears the SYN rate protection currently defined per interface.
STEP 2 Click Add.
STEP 3 Enter the parameters.
• Interface—Select the interface on which the rate protection is being defined.
• IP Address—Enter the IP address for which the SYN rate protection is defined or select
All 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.
• SYN Rate Limit—Enter the number of SYN packets that be received.
STEP 4 Click Apply. The SYN rate protection is defined, and the Running Configuration is updated.
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