System information

Field Description
Address Specifies all the existing Server Addresses. If no Server configuration exists, a
message saying “No SNTP server exists” flashes on the screen.
Last Update Time Specifies the local date and time (UTC) that the response from this server was
used to update the system clock.
Last Attempt Time Specifies the local date and time (UTC) that this SNTP server was last queried.
Last Attempt Status Specifies the status of the last SNTP request to this server. If no packet has been
received from this server, a status of Other is displayed:
• Other: None of the following enumeration values.
• Success: The SNTP operation was successful and the system time was
updated.
• Request Timed Out: A directed SNTP request timed out without receiving a
response from the SNTP server.
• Bad Date Encoded: The time provided by the SNTP server is not valid.
• Version Not Supported: The SNTP version supported by the server is not
compatible with the version supported by the client.
• Server Unsynchronized: The SNTP server is not synchronized with its
peers. This is indicated via the 'leap indicator' field on the SNTP message.
• Server Kiss Of Death: The SNTP server indicated that no further queries
were to be sent to this server. This is indicated by a stratum field equal to 0 in
a message received from a server.
Requests Specifies the number of SNTP requests made to this server since last agent
reboot.
Failed Requests Specifies the number of failed SNTP requests made to this server since last
reboot.
46 | Chapter 2: Configuring System Information
GS752TXS Smart Switch Software Administration Manual
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Denial of Service
Use the Denial of Service (DoS) page to configure DoS control. The GS752TXS Smart
Switch software provides support for classifying and blocking specific types of DoS attacks.
You can configure your system to monitor and block the following types of attacks:
• Denial of Service Min TCP Header Size: Specify the Min TCP Hdr Size allowed. If DoS
TCP Fragment is enabled, the switch will drop these packets:
• First TCP fragments that has a TCP payload: IP_Payload_Length - IP_Header_Size <
Min_TCP_Header_Size. Its range is (0 to 255). The default value is 20.
• Denial of Service ICMPv4: Enabling ICMPv4 DoS prevention causes the switch to drop
ICMPv4 packets that have a type set to ECHO_REQ (ping) and a size greater than the
configured ICMPv4 Pkt Size. The factory default is disabled.
• Denial of Service Max ICMPv4 Packet Size: Specify the Max ICMPv4 Pkt Size allowed.
If ICMPv4 DoS prevention is enabled, the switch will drop IPv4 ICMP ping packets that