Netgear GS748Tv4 GS748Tv4 Software Administration Manual - Page 48
DNS, Denial of Service Mx ICMP Pkt Size - gs748t 48 port
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GS748T Smart Switch Software Administration Manual • Denial of Service TCP Fragment: TCP Header size is smaller than the configured value. Enable or disable this option by selecting the corresponding line on the radio button. Enabling TCP Fragment DoS prevention causes the switch to drop packets that have a TCP header smaller than the configured Min TCP Hdr Size. The factory default is disabled. • Denial of Service TCP Flag: Enable or disable this option by selecting the corresponding line on the radio button. Enabling TCP Flag DoS prevention causes the switch to drop packets that have TCP flag SYN set and TCP source port less than 1024 or TCP control flags set to 0 and TCP sequence number set to 0 or TCP flags FIN, URG, and PSH set and TCP sequence number set to 0 or both TCP flags SYN and FIN set. The factory default is disabled. • Denial of Service L4 Port: Enable or disable this option by selecting the corresponding line on the radio button. Enabling L4 Port DoS prevention causes the switch to drop packets that have TCP/UDP source port equal to TCP/UDP destination port. The factory default is disabled. • Denial of Service ICMP: Enable or disable this option by selecting the corresponding line on the radio button. Enabling ICMP DoS prevention causes the switch to drop ICMP packets that have a type set to ECHO_REQ (ping) and a size greater than the configured ICMP Pkt Size. The factory default is disabled. • Denial of Service Mx ICMP Pkt Size: If ICMP DoS prevention is enabled and if the ICMP echo request is carried in an unfragmented IPv4/IPv6 datagram and if the total length (in the IP header)indicates a value greater than MAX ICMP Size configured + IP header length, then the specified packet is dropped. The factory default is 512. 2. If you change any of the DoS settings, click Apply to apply the changes to the switch. 3. Click Cancel to cancel the configuration on the screen and reset the data on the screen to the latest value of the switch. DNS You can use these pages to configure information about DNS servers the network uses and how the switch operates as a DNS client. DNS Configuration Use this page to configure global DNS settings and DNS server information. To access this page, click System > Management > DNS > DNS Configuration. 48 | Chapter 2: Configuring System Information