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Services, DHCP Snooping, Global Configuration

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GS716Tv3, GS724Tv4, and GS748Tv5 Smart Switches Services This section describes how to configure the DHCP snooping and Dynamic ARP Inspection (DAI) features on the switch. DHCP snooping and DAI are layer 2 security features that examine traffic to help prevent accidental and malicious attacks on the switch or network. From the Services configuration menu, you can access screens described in the following sections: • DHCP Snooping • Dynamic ARP Inspection DHCP Snooping DHCP snooping is a useful feature that provides security by filtering untrusted DHCP messages and by building and maintaining a DHCP snooping binding table. An untrusted message is a message that is received from outside the network or firewall and that can cause traffic attacks within your network. The DHCP snooping binding table contains the MAC address, IP address, lease time, binding type, VLAN number, and interface information that corresponds to the local untrusted interfaces of a switch. An untrusted interface is an interface that is configured to receive messages from outside the network or firewall. A trusted interface is an interface that is configured to receive only messages from within the network. DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. It also provides way to differentiate between untrusted interfaces connected to the end user and trusted interfaces connected to the DHCP server or another switch. Global Configuration Use this screen to view and configure the global settings for DHCP snooping.  To configure DHCP snooping global settings: 1. Select System > Services > DHCP Snooping > Global Configuration. 2. Next to DHCP Snooping Mode, enable the DHCP Snooping feature. 3. (Optionally) Next to MAC Address Validation, enable the verification of the sender MAC address for DHCP snooping. When MAC address validation is enabled, the device checks packets that are received on an untrusted interface to verify that the MAC address and the DHCP client hardware address match. If the addresses do not match, the device drops the packet. 4. Click the Apply button.  To enable DHCP snooping for all interfaces that are members of a VLAN: 1. In the VLAN ID field, specify the VLAN on which DHCP snooping is enabled. 2. From the DHCP Snooping Mode list, select Enable. 3. Click the Apply button. Configure System Information 70

Section	Page
GS716Tv3, GS724Tv4, and GS748Tv5 Smart Switches	1
Contents	3
1. Getting Started	9
Getting Started with the NETGEAR Switch	10
Switch Management Interface	11
Connect the Switch to the Network	12
Discover a Switch in a Network with a DHCP Server	13
Discover a Switch in a Network without a DHCP Server	15
Configure the Network Settings on the Administrative System	16
Access the Management Interface from a Web Browser	19
Understand the User Interfaces	19
Use the Web Interface	19
Use SNMPv3	26
Interface Naming Convention	27
Configuring Interface Settings	28
Online Help	33
Support	33
User Guide	33
Registration	34
2. Configure System Information	35
Management	36
System Information	36
IP Configuration	37
IPv6 Network Configuration	39
IPv6 Network Neighbor	40
Time	41
Denial of Service	46
DNS	48
Green Ethernet	50
License	55
SNMP	56
Configure the SNMPv1/v2 Community	56
LLDP	59
LLDP Configuration	60
LLDP Port Settings	61
LLDP-MED Network Policy	62
LLDP-MED Port Settings	63
Local Information	63
Neighbors Information	66
Services	70
DHCP Snooping	70
Statistics	74
Dynamic ARP Inspection	75
3. Configuring Switching	80
Ports	81
Port Configuration	81
Flow Control	82
Link Aggregation Groups	83
LAG Configuration	83
LAG Membership	85
LACP Configuration	86
LACP Port Configuration	86
VLANs	87
Basic VLAN Configuration	88
VLAN Membership Configuration	89
VLAN Status	90
Port VLAN ID Configuration	91
MAC-Based VLAN	92
Protocol-Based VLAN Group Configuration	93
Protocol-Based VLAN Group Membership	94
Voice VLAN	94
Auto-VoIP Configuration	95
Configure Protocol-Based Auto VoIP Settings	95
OUI-Based Properties	96
Port Settings	96
OUI Table	97
Spanning Tree Protocol	98
STP Configuration	99
CST Configuration	100
CST Port Configuration	101
CST Port Status	102
Rapid STP	103
MST Configuration	104
MST Port Configuration	105
STP Statistics	107
Multicast	108
MFDB Table	108
MFDB Statistics	109
Auto-Video	110
IGMP Snooping	110
IGMP Snooping Querier	115
MLD Snooping	117
MVR Configuration	123
MVR Configuration	124
MVR Group Configuration	125
MVR Interface Configuration	126
MVR Group Membership	126
MVR Statistics	127
Address Table	128
MAC Address Table	128
Dynamic Address Configuration	129
Static MAC Address	130
Multiple Registration Protocol Configuration	131
MRP Configuration	133
MRP Port Settings	134
MMRP Statistics	135
MVRP Statistics	136
MSRP Statistics	137
MSRP Reservation Parameters	138
Qav Parameters	139
MSRP Streams Information	140
802.1AS	142
802.1AS Configuration	142
802.1AS Port Settings	143
802.1AS Statistics	145
4. Configuring Routing	147
Configure IP Settings	148
IP Configuration	148
IP Statistics	149
Configure VLAN Routing	152
VLAN Routing Wizard	152
VLAN Routing Configuration	153
Configure Router Discovery	154
Configure and View Routes	155
Configure ARP	157
ARP Cache	158
Create a Static ARP Entry	159
Configure Global ARP Settings	159
Remove an ARP Entry From the ARP Cache	160
5. Configuring Quality of Service	161
Class of Service	162
CoS Configuration	162
CoS Interface Configuration	164
Interface Queue Configuration	165
802.1p to Queue Mapping	166
DSCP to Queue Mapping	166
Differentiated Services	167
Defining DiffServ	167
Diffserv Configuration	168
Class Configuration	169
IPv6 Class Configuration	172
Policy Configuration	173
Service Configuration	176
Service Statistics	176
6. Managing Device Security	177
Management Security Settings	178
Change Password	178
RADIUS Configuration	179
Configure TACACS+	183
Authentication List Configuration	185
Configuring Management Access	188
HTTP Configuration	188
Secure HTTP Configuration	189
Certificate Management	190
Certificate Download	190
Access Control	192
Port Authentication	194
802.1X Configuration	194
Port Authentication	195
Port Summary	198
Client Summary	199
Traffic Control	200
MAC Filter Configuration	200
MAC Filter Summary	201
Storm Control	202
Port Security Configuration	203
Port Security Interface Configuration	203
Security MAC Address	204
Protected Ports Membership	205
Configure Access Control Lists	206
ACL Wizard	207
MAC ACL	210
MAC Rules	211
MAC Binding Configuration	213
MAC Binding Table	214
IP ACL	215
IP Rules	216
IP Extended Rules	218
IPv6 ACL	221
IPv6 Rules	222
IP Binding Configuration	224
IP Binding Table	225
VLAN Binding Table	225
7. Monitoring the System	227
Ports	227
Switch Statistics	228
Port Statistics	230
Port Detailed Statistics	231
EAP Statistics	237
Cable Test	238
Logs	239
Memory Logs	240
Server Log	242
Trap Logs	244
Event Logs	245
Mirroring	245
8. Maintenance	247
Reset	247
Device Reboot	247
Factory Default	248
Upload	248
TFTP File Upload	249
HTTP File Upload	250
Download	251
TFTP File Download	251
HTTP File Download	253
File Management	254
Copy	254
Dual Image Configuration	255
Dual Image Status	256
9. Troubleshooting	257
Troubleshooting Configuration Menu	257
Ping	257
Ping IPv6	258
TraceRoute IPv4	259
TraceRoute IPv6	260
Troubleshooting Chart	261
A. Configuration Examples	262
Virtual Local Area Network Configuration Example	263
Access Control Lists (ACLs)	266
MAC ACL Configuration Example	266
Standard IP ACL Configuration Example	268
Differentiated Services	269
Class	269
DiffServ Traffic Classes	270
Creating Policies	270
DiffServ Configuration Example	272
802.1X Configuration Example	273
MSTP	276
MSTP Configuration Example	278
VLAN Routing Interface Configuration Example	280
B. Hardware Specifications and Default Values	282
Switch Specifications	282
Switch Features and Defaults	283

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Configure System Information

GS716Tv3, GS724Tv4, and GS748Tv5 Smart Switches

Services

This section describes how to configure the DHCP snooping and Dynamic ARP Inspection

(DAI) features on the switch. DHCP snooping and DAI are layer 2 security features that

examine traffic to help prevent accidental and malicious attacks on the switch or network.

From the Services configuration menu, you can access screens described in the following

sections:

•

DHCP Snooping

•

Dynamic ARP Inspection

DHCP Snooping

DHCP snooping is a useful feature that provides security by filtering untrusted DHCP

messages and by building and maintaining a DHCP snooping binding table. An untrusted

message is a message that is received from outside the network or firewall and that can

cause traffic attacks within your network. The DHCP snooping binding table contains the

MAC address, IP address, lease time, binding type, VLAN number, and interface information

that corresponds to the local untrusted interfaces of a switch. An untrusted interface is an

interface that is configured to receive messages from outside the network or firewall. A

trusted interface is an interface that is configured to receive only messages from within the

network.

DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. It also

provides way to differentiate between untrusted interfaces connected to the end user and

trusted interfaces connected to the DHCP server or another switch.

Global Configuration

Use this screen to view and configure the global settings for DHCP snooping.



To configure DHCP snooping global settings:

Select

System

Services

DHCP Snooping

Global Configuration

Next to DHCP Snooping Mode, enable the DHCP Snooping feature.

(Optionally) Next to MAC Address Validation, enable the verification of the sender MAC

address for DHCP snooping.

When MAC address validation is enabled, the device checks packets that are received on

an untrusted interface to verify that the MAC address and the DHCP client hardware

address match. If the addresses do not match, the device drops the packet.

Click the

Apply

button.



To enable DHCP snooping for all interfaces that are members of a VLAN:

In the VLAN ID field, specify the VLAN on which DHCP snooping is enabled.

From the DHCP Snooping Mode list, select

Enable

Click the

Apply

button.