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DoS Attack Type, Description, Network Security, DoS Defend

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DoS Attack Type Description Land Attack The attacker sends a specific fake SYN packet to the destination Host. Since both the source IP address and the destination IP address of the SYN packet are set to be the IP address of the Host, the Host will be trapped in an endless circle for building the initial connection. The performance of the network will be reduced extremely. Scan SYNFIN The attacker sends the packet with its SYN field and the FIN field set to 1. The SYN field is used to request initial connection whereas the FIN field is used to request disconnection. Therefore, the packet of this type is illegal. The switch can defend this type of illegal packet. Xmascan The attacker sends the illegal packet with its TCP index, FIN, URG and PSH field set to 1. NULL Scan Attack The attacker sends the illegal packet with its TCP index and all the control fields set to 0. During the TCP connection and data transmission, the packets with all the control fields set to 0 are considered as the illegal packets. SYN packet with its source port The attacker sends the illegal packet with its TCP SYN field set to 1 and less than 1024 source port less than 1024. Blat Attack The attacker sends the illegal packet with its source port and destination port on Layer 4 the same and its URG field set to 1. Similar to the Land Attack, the system performance of the attacked Host is reduced since the Host circularly attempts to build a connection with the attacker. Ping Flooding The attacker floods the destination system with Ping broadcast storm packets to forbid the system to respond to the legal communication. SYN/SYN-ACK Flooding The attacker uses a fake IP address to send TCP request packets to the Server. Upon receiving the request packets, the Server responds with SYN-ACK packets. Since the IP address is fake, no response will be returned. The Server will keep on sending SYN-ACK packets. If the attacker sends overflowing fake request packets, the network resource will be occupied maliciously and the requests of the legal clients will be denied. Table 11-1 Defendable DoS Attack Types On this page, you can enable the DoS Defend type appropriate to your need. Choose the menu Network Security→DoS Defend→DoS Defend to load the following page. 154

Section	Page
Package Contents	8
Chapter 1 About this Guide	9
1.1 Intended Readers	9
1.2 Conventions	9
1.3 Overview of This Guide	9
Chapter 2 Introduction	13
2.1 Overview of the Switch	13
2.2 Main Features	13
2.3 Appearance Description	14
2.3.1 Front Panel	14
2.3.2 Rear Panel	15
Chapter 3 Login to the Switch	16
3.1 Login	16
3.2 Configuration	16
Chapter 4 System	18
4.1 System Info	18
4.1.1 System Summary	18
4.1.2 Device Description	20
4.1.3 System Time	20
4.1.4 System IP	22
4.2 User Manage	23
4.2.1 User Table	23
4.2.2 User Config	23
4.3 System Tools	25
4.3.1 Config Restore	25
4.3.2 Config Backup	25
4.3.3 Firmware Upgrade	26
4.3.4 System Reboot	27
4.3.5 System Reset	27
4.4 Access Security	27
4.4.1 Access Control	27
4.4.2 SSL Config	29
4.4.3 SSH Config	30
Chapter 5 Switching	36
5.1 Port	36
5.1.1 Port Config	36
5.1.2 Port Mirror	37
5.1.3 Port Security	39
5.2 LAG	40
5.2.1 LAG Table	41
5.2.2 Static LAG	42
5.2.3 LACP Config	43
5.3 Traffic Monitor	45
5.3.1 Traffic Summary	45
5.3.2 Traffic Statistics	46
5.4 MAC Address	47
5.4.1 Address Table	48
5.4.2 Static Address	50
5.4.3 Dynamic Address	51
5.4.4 Filtering Address	53
Chapter 6 VLAN	55
6.1 802.1Q VLAN	56
6.1.1 VLAN Config	58
6.1.2 Port Config	60
6.2 MAC VLAN	62
6.3 Protocol VLAN	63
6.3.1 Protocol Group Table	66
6.3.2 Protocol Group	66
6.3.3 Protocol Template	67
6.4 Application Example for 802.1Q VLAN	68
6.5 Application Example for MAC VLAN	70
6.6 Application Example for Protocol VLAN	71
6.7 GVRP	73
Chapter 7 Spanning Tree	77
7.1 STP Config	82
7.1.1 STP Config	82
7.1.2 STP Summary	84
7.2 Port Config	84
7.3 MSTP Instance	86
7.3.1 Region Config	86
7.3.2 Instance Config	87
7.3.3 Instance Port Config	88
7.4 STP Security	90
7.4.1 Port Protect	90
7.4.2 TC Protect	93
7.5 Application Example for STP Function	93
Chapter 8 Multicast	97
8.1 IGMP Snooping	99
8.1.1 Snooping Config	100
8.1.2 Port Config	101
8.1.3 VLAN Config	102
8.1.4 Multicast VLAN	104
8.2 Multicast IP	107
8.2.1 Multicast IP Table	108
8.2.2 Static Multicast IP	108
8.3 Multicast Filter	109
8.3.1 IP-Range	110
8.3.2 Port Filter	111
8.4 Packet Statistics	112
Chapter 9 QoS	114
9.1 DiffServ	117
9.1.1 Port Priority	117
9.1.2 Schedule Mode	118
9.1.3 802.1P Priority	119
9.1.4 DSCP Priority	119
9.2 Bandwidth Control	121
9.2.1 Rate Limit	121
9.2.2 Storm Control	122
9.3 Voice VLAN	123
9.3.1 Global Config	125
9.3.2 Port Config	126
9.3.3 OUI Config	127
Chapter 10 ACL	129
10.1 Time-Range	129
10.1.1 Time-Range Summary	129
10.1.2 Time-Range Create	130
10.1.3 Holiday Config	131
10.2 ACL Config	131
10.2.1 ACL Summary	132
10.2.2 ACL Create	132
10.2.3 MAC ACL	133
10.2.4 Standard-IP ACL	134
10.2.5 Extend-IP ACL	134
10.3 Policy Config	136
10.3.1 Policy Summary	136
10.3.2 Policy Create	137
10.3.3 Action Create	137
10.4 Policy Binding	138
10.4.1 Binding Table	138
10.4.2 Port Binding	139
10.4.3 VLAN Binding	139
10.5 Application Example for ACL	140
Chapter 11 Network Security	143
11.1 IP-MAC Binding	143
11.1.1 Binding Table	143
11.1.2 Manual Binding	144
11.1.3 ARP Scanning	146
11.1.4 DHCP Snooping	147
11.2 ARP Inspection	153
11.2.1 ARP Detect	157
11.2.2 ARP Defend	158
11.2.3 ARP Statistics	159
11.3 DoS Defend	160
11.4 802.1X	162
11.4.1 Global Config	166
11.4.2 Port Config	168
11.4.3 Radius Server	169
Chapter 12 SNMP	171
12.1 SNMP Config	173
12.1.1 Global Config	173
12.1.2 SNMP View	174
12.1.3 SNMP Group	175
12.1.4 SNMP User	176
12.1.5 SNMP Community	178
12.2 Notification	180
12.3 RMON	182
12.3.1 History Control	183
12.3.2 Event Config	183
12.3.3 Alarm Config	184
Chapter 13 Cluster	187
13.1 NDP	188
13.1.1 Neighbor Info	188
13.1.2 NDP Summary	189
13.1.3 NDP Config	191
13.2 NTDP	192
13.2.1 Device Table	192
13.2.2 NTDP Summary	193
13.2.3 NTDP Config	194
13.3 Cluster	196
13.3.1 Cluster Summary	196
13.3.2 Cluster Config	197
13.4 Application Example for Cluster Function	199
Chapter 14 Maintenance	202
14.1 System Monitor	202
14.1.1 CPU Monitor	202
14.1.2 Memory Monitor	203
14.2 Log	204
14.2.1 Log Table	205
14.2.2 Local Log	205
14.2.3 Remote Log	206
14.2.4 Backup Log	207
14.3 Device Diagnose	208
14.3.1 Cable Test	208
14.3.2 Loopback	209
14.4 Network Diagnose	209
14.4.1 Ping	209
14.4.2 Tracert	210
Appendix A: Specifications	212
Appendix B: Configuring the PCs	213
Appendix C: Load Software using FTP	216
Appendix D: 802.1X Client Software	221

Match case Limit results 1 per page

DoS Attack Type

Description

Land Attack

The attacker sends a specific fake SYN packet to the destination Host.

Since both the source IP address and the destination IP address of the SYN

packet are set to be the IP address of the Host, the Host will be trapped in

an endless circle for building the initial connection. The performance of the

network will be reduced extremely.

Scan SYNFIN

The attacker sends the packet with its SYN field and the FIN field set to 1.

The SYN field is used to request initial connection whereas the FIN field is

used to request disconnection. Therefore, the packet of this type is illegal.

The switch can defend this type of illegal packet.

Xmascan

The attacker sends the illegal packet with its TCP index, FIN, URG and

PSH field set to 1.

NULL Scan Attack

The attacker sends the illegal packet with its TCP index and all the control

fields set to 0. During the TCP connection and data transmission, the

packets with all the control fields set to 0 are considered as the illegal

packets.

SYN packet with its source port

less than 1024

The attacker sends the illegal packet with its TCP SYN field set to 1 and

source port less than 1024.

Blat Attack

The attacker sends the illegal packet with its source port and destination

port on Layer 4 the same and its URG field set to 1. Similar to the Land

Attack, the system performance of the attacked Host is reduced since the

Host circularly attempts to build a connection with the attacker.

Ping Flooding

The attacker floods the destination system with Ping broadcast storm

packets to forbid the system to respond to the legal communication.

SYN/SYN-ACK Flooding

The attacker uses a fake IP address to send TCP request packets to the

Server. Upon receiving the request packets, the Server responds with

SYN-ACK packets. Since the IP address is fake, no response will be

returned. The Server will keep on sending SYN-ACK packets. If the attacker

sends overflowing fake request packets, the network resource will be

occupied maliciously and the requests of the legal clients will be denied.

Table 11-1 Defendable DoS Attack Types

On this page, you can enable the DoS Defend type appropriate to your need.

Choose the menu

Network Security

→

DoS Defend

→

DoS Defend

to load the following page.

154