Cisco Small Business 300, Руководство администратора

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Security
Denial of Service Prevention
Cisco Small Business 300 Series Managed Switch Administration Guide 346
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STEP 3
To add a Martian address click Add .
STEP 4
Enter the parameters.
• IP Version —Indicates the supported IP version. Currently, support is only
offered for IPv4.
• IP Address —Enter an IP addresses to reject. The possible values are:
-
From Reserved List
—Select a well-known IP address from the reserved
list.
- New IP Address —Enter an IP address.
• Mask —Enter the mask of the IP address to define a range of IP addresses to
reject. The values are:
- Network Mask —Network mask in dotted decimal format.
-
Prefix Length
—Enter the prefix of the IP address to define the range of IP
addresses for which Denial of Service prevention is enabled.
STEP 5
Click Apply . The Martian addresses are written to the Running Configuration file.
SYN Filtering
The SYN Filtering page enables filtering TCP packets that contain a SYN flag, and
are destined for one or more ports.
To define a SYN filter:
STEP 1
Click Security > Denial of Service Prevention > SYN Filtering .
STEP 2
Click Add .
STEP 3
Enter the parameters.
• Interface —Select the interface on which the filter is defined.
• IPv4 Address —Enter the IP address for which the filter is defined, or select
All Addresses .
• Network Mask —Enter the network mask for which the filter is enabled in IP
address format.
• TCP Port —Select the destination TCP port being filtered:
- Known Ports —Select a port from the list.