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Dell PowerConnect 8024 CLI Reference Guide - Page 943

Denial of Service Commands, dos-control firstfrag, Syntax, Default Configuration

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61 Denial of Service Commands This chapter explains the following commands: • dos-control firstfrag • dos-control icmp • dos-control l4port • dos-control sipdip • dos-control tcpflag • dos-control tcpfrag • ip icmp echo-reply • ip icmp error-interval • ip unreachables • ip redirects • ipv6 icmp error-interval • ipv6 unreachables • show dos-control dos-control firstfrag Use the dos-control firstfrag command in Global Configuration mode to enable Minimum TCP Header Size Denial of Service protection. If the mode is enabled, Denial of Service prevention is active for this type of attack. If packets ingress having a TCP Header Size smaller than the configured value, the packets are dropped. Syntax dos-control firstfrag [size] no dos-control firstfrag • size -TCP header size. (Range: 0-255). The default TCP header size is 20. ICMP packet size is 512. Default Configuration Denial of Service is disabled. Denial of Service Commands 943

Section	Page
CLI Reference Guide	1
Command Groups	47
Introduction	47
Command Groups	47
Mode Types	51
Layer 2 Commands	52
AAA	52
ACL	53
Address Table	54
Auto-VoIP	55
CDP Interoperability	55
Data Center Bridging	56
DHCP l2 Relay	56
DHCP Snooping	57
Dynamic ARP Inspection	58
Ethernet Configuration	59
GVRP	60
IGMP Snooping	60
IGMP Snooping Querier	61
IP Addressing	61
IPv6 ACL	62
IPv6 MLD Snooping	63
IPv6 MLD Snooping Querier	63
iSCSI Flow Acceleration	64
LACP	64
Link Dependency	65
LLDP	66
Port Channel	67
Port Monitor	67
QoS	67
RADIUS	70
Spanning Tree	72
TACACS+	73
VLAN	74
Voice VLAN	75
802.1X	76
Layer 3 Commands	77
ARP (IPv4)	77
DHCP and BOOTP Relay (IPv4)	78
DHCPv6	78
DVMRP	79
IGMP	79
IGMP Proxy	80
IP Helper	81
IP Routing	81
IPv6 Multicast	82
IPv6 Routing	83
Loopback Interface	86
Multicast	86
OSPF	87
OSPFv3	90
PIM-DM	93
PIM-SM	93
Router Discovery Protocol	94
Routing Information Protocol	95
Tunnel Interface	96
Virtual Router Redundancy	96
Utility Commands	97
Auto Config	97
Captive Portal	97
Clock	99
Configuration and Image Files	100
Denial of Service	101
Line	101
Management ACL	102
Password Management	102
PHY Diagnostics	103
RMON	103
Serviceability Tracing	103
sFlow	105
SNMP	105
SSH	106
Syslog	107
System Management	107
Telnet Server	109
User Interface	109
Web Server	110
Using the CLI	111
Introduction	111
Entering and Editing CLI Commands	111
History Buffer	112
Negating Commands	112
Show Command	112
Command Completion	113
Short Form Commands	113
Keyboard Shortcuts	113
Operating on Multiple Objects (Range)	114
Command Scripting	115
CLI Command Notation Conventions	115
Interface Naming Conventions	115
CLI Command Modes	116
User EXEC Mode	117
Privileged EXEC Mode	117
Global Configuration Mode	117
Interface and Other Specific Configuration Modes	117
Identifying the Switch and Command Mode from the System Prompt	119
Navigating CLI Command Modes	119
Starting the CLI	125
Easy Setup Wizard	126
Using CLI Functions and Tools	132
Configuration Management	132
Management Interface Security	133
Management ACL	136
Other CLI Tools and Capabilities	137
Layer 2 Commands	145
Introduction	145
AAA Commands	147
aaa authentication dot1x	147
Syntax	147
Default Configuration	148
Command Mode	148
User Guidelines	148
Example	148
aaa authentication enable	148
Syntax	148
Default Configuration	149
Command Mode	149
User Guidelines	149
Example	149
aaa authentication login	149
Syntax	150
Default Configuration	150
Command Mode	150
User Guidelines	150
Example	151
aaa authorization network default radius	151
Syntax	151
Default Configuration	151
Command Mode	151
User Guidelines	151
Example	151
enable authentication	151
Syntax	151
Default Configuration	152
Command Mode	152
User Guidelines	152
Example	152
enable password	152
Syntax	152
Default Configuration	152
Command Mode	152
User Guidelines	153
Example	153
ip http authentication	153
Syntax	153
Default Configuration	153
Command Mode	153
User Guidelines	153
Example	154
ip https authentication	154
Syntax	154
Default Configuration	154
Command Mode	154
User Guidelines	154
Example	154
login authentication	155
Syntax	155
Default Configuration	155
Command Mode	155
User Guidelines	155
Example	155
password (Line Configuration)	155
Syntax	155
Default Configuration	156
Command Mode	156
User Guidelines	156
Example	156
password (User EXEC)	156
Syntax	156
Default Configuration	156
Command Mode	156
User Guidelines	156
Example	156
show authentication methods	157
Syntax	157
Default Configuration	157
Command Mode	157
User Guidelines	157
Example	157
show users accounts	158
Syntax	158
Default Configuration	158
Command Mode	158
User Guidelines	158
Example	158
show users login-history	158
Syntax	159
Default Configuration	159
Command Mode	159
User Guidelines	159
Example	159
username	159
Syntax	159
Default Configuration	160
Command Mode	160
User Guidelines	160
Example	160
ACL Commands	161
access-list	161
Syntax	161
Default Configuration	162
Command Mode	162
User Guidelines	162
Examples	162
deny \| permit	162
Syntax	163
Default Configuration	163
Command Mode	163
User Guidelines	163
Example	164
ip access-group	164
no ip access-group	164
Syntax	164
Default Configuration	164
Command Mode	164
User Guidelines	164
Examples	164
mac access-group	165
Syntax	165
Default Configuration	165
Command Mode	165
User Guidelines	165
Example	165
mac access-list extended	166
Syntax	166
Default Configuration	166
Command Mode	166
User Guidelines	166
Example	166
mac access-list extended rename	166
Syntax	166
Default Configuration	166
Command Mode	167
User Guidelines	167
Example	167
show ip access-lists	167
Syntax	167
Examples	167
show mac access-list	168
Syntax	168
Default Configuration	168
Command Mode	168
User Guidelines	168
Example	168
Address Table Commands	169
bridge address	170
Syntax	170
Default Configuration	170
Command Mode	170
User Guidelines	170
Example	170
bridge aging-time	170
Syntax	170
Default Configuration	171
Command Mode	171
User Guidelines	171
Example	171
bridge multicast address	171
Syntax	171
Default Configuration	171
Command Mode	172
User Guidelines	172
Examples	172
bridge multicast filtering	172
Syntax	172
Default Configuration	172
Command Mode	172
User Guidelines	172
Example	173
bridge multicast forbidden address	173
Syntax	173
Default Configuration	173
Command Mode	173
User Guidelines	173
Examples	173
bridge multicast forbidden forward-unregistered	174
Syntax	174
Default Configuration	174
Command Mode	174
User Guidelines	174
Example	174
bridge multicast forward-all	174
Syntax	174
Default Configuration	175
Command Mode	175
User Guidelines	175
Example	175
bridge multicast forward-unregistered	175
Syntax	175
Default Configuration	175
Command Mode	175
User Guidelines	175
Example	175
clear bridge	176
Syntax	176
Default Configuration	176
Command Mode	176
User Guidelines	176
Example	176
port security	176
Syntax	176
Default Configuration	176
Command Mode	177
User Guidelines	177
Example	177
port security max	177
Syntax	177
Default Configuration	177
Command Mode	177
User Guidelines	177
Example	177
show bridge address-table	178
Syntax	178
Default Configuration	178
Command Mode	178
User Guidelines	178
Example	178
show bridge address-table count	178
Syntax	179
Default Configuration	179
Command Mode	179
User Guidelines	179
Example	179
show bridge address-table static	179
Syntax	179
Default Configuration	180
Command Mode	180
User Guidelines	180
Example	180
show bridge multicast address-table	180
Syntax	180
Default Configuration	180
Command Mode	180
User Guidelines	181
Example	181
show bridge multicast filtering	181
Syntax	181
Default Configuration	181
Command Mode	181
User Guidelines	182
Example	182
show ports security	182
Syntax	182
Default Configuration	182
Command Mode	182
User Guidelines	182
Example	182
show ports security addresses	183
Syntax	183
Default Configuration	183
Command Mode	183
User Guidelines	183
Examples	184
Auto-VoIP Commands	185
show switchport voice	185
Syntax	185
Default Configuration	185
Command Mode	185
User Guidelines	185
Example	185
switchport voice detect auto	187
Syntax	187
Default Configuration	187
Command Mode	187
User Guidelines	187
Example	187
CDP Interoperability Commands	189
clear isdp counters	189
Syntax	189
Default Configuration	189
Command Mode	189
User Guidelines	189
Example	190
clear isdp table	190
Syntax	190
Default Configuration	190
Command Mode	190
User Guidelines	190
Example	190
isdp advertise-v2	190
Syntax	190
Default Configuration	190
Command Mode	190
User Guidelines	190
Example	191
isdp enable	191
Syntax	191
Default Configuration	191
Command Mode	191
User Guidelines	191
Example	191
isdp holdtime	191
Syntax	191
Default Configuration	192
Command Mode	192
User Guidelines	192
Example	192
isdp timer	192
Syntax	192
Default Configuration	192
Command Mode	192
User Guidelines	192
Example	192
show isdp	193
Syntax	193
Default Configuration	193
Command Mode	193
User Guidelines	193
Example	193
show isdp entry	193
Syntax	193
Default Configuration	194
Command Mode	194
User Guidelines	194
Example	194
show isdp interface	194
Syntax	195
Default Configuration	195
Command Mode	195
User Guidelines	195
Example	195
show isdp neighbors	196
Syntax	196
Default Configuration	196
Command Mode	196
User Guidelines	197
Example	197
show isdp traffic	198
Syntax	198
Default Configuration	198
Command Mode	198
User Guidelines	198
Example	199
Data Center Bridging Commands	201
clear priority-flow-control statistics	201
Syntax	201
Command Mode	201
User Guidelines	201
Example #1	201
Example #2	201
Example #3	201
datacenter-bridging	202
Syntax	202
Default Configuration	202
Command Mode	202
User Guidelines	202
Example	202
priority-flow-control mode on	202
Syntax	202
Default Configuration	202
Command Mode	203
User Guidelines	203
Example	203
priority-flow-control priority	203
Syntax	203
Default Configuration	203
Command Mode	203
User Guidelines	203
Example	203
show interfaces datacenter-bridging	204
Syntax	204
Command Mode	204
User Guidelines	204
Example #1	204
Example #2	205
Example #3	205
DHCP Layer 2 Relay Commands	207
dhcp l2relay (Global Configuration)	207
Syntax	207
Default Configuration	207
Command Mode	207
User Guidelines	207
Example	207
dhcp l2relay (Interface Configuration)	208
Syntax	208
Default Configuration	208
Command Mode	208
User Guidelines	208
Example	208
dhcp l2relay circuit-id	208
Syntax	208
Default Configuration	208
Command Mode	208
User Guidelines	209
Example	209
dhcp l2relay remote-id	209
Syntax	209
Default Configuration	209
Command Mode	209
User Guidelines	209
Example	209
dhcp l2relay trust	209
Syntax	209
Default Configuration	210
Configuration Mode	210
User Guidelines	210
Example	210
dhcp l2relay vlan	210
Syntax	210
Default Configuration	210