Table 3-1 describes the dos-controlkeywords.

Table 3-1. DoS Control

Keyword

Meaning

 

 

firstfrag

Enabling First Fragment DoS prevention causes the switch to drop packets that

 

have a TCP header smaller then the configured Min TCP Hdr Size.

icmp

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.

l4port

Enabling L4 Port DoS prevention causes the switch to drop packets that have

 

TCP/UDP source port equal to TCP/UDP destination port.

sipdip

Enabling SIP=DIP DoS prevention causes the switch to drop packets that have a

 

source IP address equal to the destination IP address.

tcpflag

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.

tcpfrag

Enabling TCP Fragment DoS prevention causes the switch to drop packets that

 

have an IP fragment offset equal to 1.

 

 

CLI Examples

The commands shown below show how to enable DoS protection and view its status.

Example #1: Enabling all DOS Controls

console#configure console(config)#dos-control sipdip console(config)#dos-control firstfrag console(config)#dos-control tcpfrag console(config)#dos-control l4port console(config)#dos-control icmp console(config)#exit

Switching Configuration

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Dell 6200 SERIES manual Describes the dos-controlkeywords, Example #1 Enabling all DOS Controls

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