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D-Link DGS-3200-16 User Manual - Page 118

DHCP Server Screening, DHCP Screening Port Settings, DHCP Offer Filtering

UPC - 790069312007

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xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch DHCP Server Screening The DHCP Server Screening folder contains two windows: DHCP Screening Port Settings and DHCP Offer Filtering. DHCP Screening Port Settings The Switch supports DHCP Server Screening, a feature that denies access to rogue DHCP servers. When the DHCP server filter function is enabled, all DHCP server packets will be filtered from a specific port. To view the following window, click Security > DHCP Server Screening > DHCP Screening Port Settings: Figure 5 - 11. DHCP Screening Port Settings window The user may set the following parameters: Parameter Description From DHCP Server Enable or disable this feature. Trap Log State Illegal Server Log Choose an illegal server log suppress duration of 1 minute, 5 minutes, or 30 minutes. Suppress Duration From Port/To Port A consecutive group of ports may be configured starting with the selected port. State Choose Enabled to enable the DHCP server screening or Disabled to disable it. The default is Disabled. After setting the previous parameters, click Apply to allow your changes to be implemented. DHCP Offer Filtering This function allows the user to not only restrict all DHCP Server packets but also to receive any specified DHCP server packet by any specified DHCP client, it is useful when one or more DHCP servers are present on the network and both provide DHCP services to different distinct groups of clients. The first time the DHCP filter is enabled it will create both an access profile entry and an access rule per port entry, it will also create other access rules. These rules are used to block all DHCP server packets. In addition to a permit DHCP entry, it will also create one access profile and one access rule entry the first time the DHCP client MAC address is used as the client MAC address. The Source IP address is the same as the DHCP server's IP address (UDP source port number 67). These rules are used to permit the DHCP server packets with specific fields, which the user has configured. To view the following window, click Security > DHCP Server Screening > DHCP Offer Filtering: 105

Section	Page
Intended Readers	9
Typographical Conventions	9
Notes, Notices, and Cautions	10
Safety Cautions	10
General Precautions for Rack-Mountable Products	11
Lithium Battery Precaution	13
Protecting Against Electrostatic Discharge	13
Web-based Switch Configuration	14
Introduction	14
Logging onto the Web Manager	14
Web-based User Interface	15
Areas of the User Interface	15
Web Pages	16
Configuration	17
Device Information	17
System Information	18
Serial Port Settings	19
IP Address	19
Setting the Switch’s IP Address using the Console Interface	21
IPv6 Interface Settings	21
IPv6 Route Table	22
IPv6 Neighbor Settings	23
Port Configuration	24
Port Settings	24
Port Description	25
Port Error Disabled	25
Static ARP Settings	26
User Accounts	27
Admin and User Privileges	27
System Log Configuration	28
System Log Settings	28
System Log Host	29
System Severity Settings	29
DHCP/BOOTP Relay	30
DHCP/BOOTP Relay Global Settings	30
The Implementation of DHCP Relay Agent Information Option 82	32
DHCP/BOOTP Relay Interface Settings	33
DHCP Local Relay Settings	33
DHCP Auto Configuration Settings	34
MAC Address Aging Time	35
Web Settings	35
Telnet Settings	36
Password Encryption	36
CLI Paging Settings	37
Firmware Information	37
Power Saving Settings	38
Dual Configuration Settings	39
SMTP Settings	40
Ping Test	41
SNTP Settings	42
Time Settings	42
TimeZone Settings	43
MAC Notification Settings	44
MAC Notification Global Settings	44
MAC Notification Port Settings	45
SNMP Settings	46
Traps	46
MIBs	46
SNMP Global State Settings	47
SNMP View Table	47
SNMP Group Table	48
SNMP User Table	49
SNMP Community Table	50
SNMP Host Table	51
SNMP v6Host Table	52
SNMP Engine ID	53
SNMP Trap Configuration	53
RMON	53
Single IP Management	54
Upgrade to v1.61	55
Single IP Settings	56
Topology	57
Tool Tips	59
Right-Click	60
Group Icon	60
Commander Switch Icon	61
Member Switch Icon	62
Candidate Switch Icon	62
Menu Bar	63
File	63
Group	63
Device	63
View	63
Help	63
Firmware Upgrade	64
Configuration File Backup/Restore	64
Upload Log File	64
Layer 2 Features	65
Jumbo Frame	65
Egress Filter Settings	66
802.1Q VLAN	66
Understanding IEEE 802.1p Priority	66
VLAN Description	67
802.1Q VLAN Tags	68
Port VLAN ID	69
Tagging and Untagging	70
Ingress Filtering	70
Default VLANs	70
Port-based VLANs	71
VLAN Segmentation	71
VLAN and Trunk Groups	71
802.1v Protocol VLAN	75
802.1v Protocol Group Settings	75
802.1v Protocol VLAN Settings	75
MAC Based VLAN Settings	77
GVRP Settings	77
PVID Auto Assign Settings	78
Trunking	79
VLAN Trunk Settings	81
LACP Port Settings	82
Traffic Segmentation	83
IGMP Snooping	83
IGMP Snooping Settings	83
Data Driven Learning Settings	84
ISM VLAN Settings	85
Restrictions and Provisos	85
ISM Profile Settings	86
IP Multicast Profile Settings	86
Limited Multicast Address Range Settings	87
Max Multicast Group Settings	88
MLD Snooping Settings	88
MLD Control Messages	88
Port Mirroring	90
Loopback Detection Settings	91
Spanning Tree	92
802.1Q-2005 MSTP	92
802.1D-2004 Rapid Spanning Tree	92
Port Transition States	93
Edge Port	93
P2P Port	93
802.1D-1998/802.1D-2004/802.1Q-2005 Compatibility	93
STP Bridge Global Settings	94
STP Port Settings	95
MST Configuration Identification	97
STP Instance Settings	98
MSTP Port Information	99
Forwarding & Filtering	100
Unicast Forwarding	100
Multicast Forwarding	100
Multicast Filtering Mode	101
QoS	102
Understanding QoS	103
Bandwidth Control	104
Traffic Control	105
802.1p Default Priority	107
802.1p User Priority	107
QoS Scheduling Mechanism	108
Security	109
Safeguard Engine	109
Trusted Host	111
IP-MAC-Port Binding	112
IMP Global Settings	112
IMP Port Settings	112
IMP Entry Settings	114
DHCP Snooping Entries	114
MAC Block List	115
Port Security	116
Port Security Settings	116
Port Lock Entries	117
DHCP Server Screening	118
DHCP Screening Port Settings	118
DHCP Offer Filtering	118
Guest VLAN	120
Limitations Using the Guest VLAN	120
802.1X (Port-Based and Host-Based Access Control)	121
Authentication Server	122
Authenticator	122
Client	123
Authentication Process	123
Understanding 802.1X Port-based and Host-based Network Access Control	124
Port-Based Network Access Control	124
Host-Based Network Access Control	125
802.1X Settings	125
802.1X User	127
Initialize Port(s)	128
Reauthenticate Port(s)	129
Authentic RADIUS Server	130
SSL Settings	131
SSH	133
SSH Configuration	133
SSH Authmode and Algorithm Settings	134
SSH User Authentication Mode	136
Access Authentication Control	137
Authentication Policy and Parameter Settings	138
Application Authentication Settings	138
Authentication Server Group	139
Authentication Server Host	140
Login Method Lists	142
Enable Method Lists	143
Configure Local Enable Password	144
Enable Admin	144
MAC-based Access Control	145
Notes about MAC-based Access Control	145
MAC-based Access Control Settings	145
MAC-based Access Control Local Settings	147
Web-based Access Control (WAC)	147
Conditions and Limitations	149
WAC Global Settings	149
WAC User Settings	150
WAC Port Settings	151
JWAC	152
JWAC Global Settings	152
JWAC Port Settings	154
JWAC User Settings	155
JWAC Customize Page Language	155
JWAC Customize Page	156
Multiple Authentication	156
Any (MAC, 802.1X or WAC) Mode	157
Any (MAC, 802.1X or JWAC) Mode	157
802.1X & IMPB Mode	158
IMPB & WAC/JWAC Mode	158
Authorization Network State Settings	159
Multiple Authentication Settings	159
Guest VLAN	160
IGMP Access Control Settings (IGMP Authentication)	161
ACL	162
Access Profile List	162
CPU Access Profile List	176
Time Range Settings	189
Monitoring	190
Device Environment	190
Cable Diagnostic	191
CPU Utilization	191
Port Utilization	193
Packet Size	194
Packets	196
Received (RX)	196
UMB_cast (RX)	198
Transmitted (TX)	199
Errors	201
Received (RX)	201
Transmitted (TX)	203
Port Access Control	205
Authenticator State	205
Authenticator Statistics	207
Authenticator Session Statistics	209
Authenticator Diagnostics	211
RADIUS Authentication	213
RADIUS Account Client	214
Browse ARP Table	216
Browse VLAN	216
Browse Router Port	217
Browse MLD Router Port	217
Browse Session Table	218
IGMP Snooping Group	218
MLD Snooping Group	219
WAC Authenticating State	220
JWAC Host Table	221
MAC Address Table	222
System Log	223
MAC-based Access Control Authentication State	224
Save Services and Tools	225
Save Configuration ID 1	225
Save Configuration ID 2	226
Save Log	226
Save All	226
Configuration File Backup & Restore	227
Upload Log File	227
Reset	227
Download Firmware	228
Reboot System	228
Appendix A – Mitigating ARP Spoofing Attacks Using Packet Content ACL	229
How ARP Spoofing Attacks a Network	232
Prevent ARP Spoofing via Packet Content ACL	233
Appendix B – Switch Log Entries	236
Appendix C – Trap Logs	247
Appendix D – Password Recovery Procedure	250
Appendix E – Glossary	251

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xStack

DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch

105

DHCP Server Screening

The

DHCP Server Screening

folder contains two windows:

DHCP Screening Port Settings

and

DHCP Offer Filtering

DHCP Screening Port Settings

The Switch supports DHCP Server Screening, a feature that denies access to rogue DHCP servers.

When the DHCP server filter function is enabled, all DHCP server packets will be filtered from a specific port.

To view the following window, click

Security > DHCP Server Screening > DHCP Screening Port Settings

Figure 5 - 11. DHCP Screening Port Settings window

The user may set the following parameters:

Parameter

Description

From DHCP Server

Trap Log State

Enable or disable this feature.

Illegal

Server

Log

Suppress Duration

Choose an illegal server log suppress duration of 1 minute, 5 minutes, or 30 minutes.

From Port/To Port

A consecutive group of ports may be configured starting with the selected port.

State

Choose

Enabled

to enable the DHCP server screening or

Disabled

to disable it. The default

Disabled

After setting the previous parameters, click

Apply

to allow your changes to be implemented.

DHCP Offer Filtering

This function allows the user to not only restrict all DHCP Server packets but also to receive any specified DHCP server packet by

any specified DHCP client, it is useful when one or more DHCP servers are present on the network and both provide DHCP

services to different distinct groups of clients. The first time the DHCP filter is enabled it will create both an access profile entry

and an access rule per port entry, it will also create other access rules.

These rules are used to block all DHCP server packets. In

addition to a permit DHCP entry, it will also create one access profile and one access rule entry the first time the DHCP client

MAC address is used as the client MAC address. The Source IP address is the same as the DHCP server’s IP address (UDP source

port number 67). These rules are used to permit the DHCP server packets with specific fields, which the user has configured.

To view the following window, click

Security > DHCP Server Screening > DHCP Offer Filtering