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Network Application, DHCP, DHCP Relay

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DWS-3160 Series Gigabit Ethernet Unified Switch Web UI Reference Guide Chapter 8 Network Application DHCP SNTP Flash File System Settings DHCP DHCP Relay DHCP Relay Global Settings This window is used to enable and configure DHCP Relay Global Settings. The relay hops count limit allows the maximum number of hops (routers) that the DHCP messages can be relayed through to be set. If a packet's hop count is more than the hop count limit, the packet is dropped. The range is between 1 and 16 hops, with a default value of 4. The relay time threshold sets the minimum time (in seconds) that the Switch will wait before forwarding a BOOTREQUEST packet. If the value in the seconds' field of the packet is less than the relay time threshold, the packet will be dropped. The range is between 0 and 65,535 seconds, with a default value of 0 seconds. To view this window, click Network Application > DHCP > DHCP Relay > DHCP Relay Global Settings as shown below: Figure 12-1 DHCP Relay Global Settings window The fields that can be configured are described below: Parameter Description DHCP Relay State DHCP Relay Hops Count Limit (1-16) DHCP Relay Time Threshold (0-65535) DHCP Relay Option 82 State Use the drop-down menu to enable or disable the DHCP Relay service on the Switch. The default is Disabled. Enter an entry between 1 and 16 to define the maximum number of router hops DHCP messages can be forwarded. The default hop count is 4. Enter an entry between 0 and 65535 seconds, and defines the maximum time limit for routing a DHCP packet. If a value of 0 is entered, the Switch will not process the value in the seconds' field of the DHCP packet. If a non-zero value is entered, the Switch will use that value, along with the hop count to determine whether to forward a given DHCP packet. Use the drop-down menu to enable or disable the DHCP Relay Agent Information Option 82 on the Switch. The default is Disabled. Enabled -When this field is toggled to Enabled, the relay agent will insert and remove DHCP relay information (option 82 field) in messages between DHCP servers and clients. When the relay agent receives the DHCP request, it adds the option 82 information, and the IP address of the relay agent (if the relay agent is 266

Section	Page
Table of Contents	3
Intended Readers	6
Typographical Conventions	6
Notes, Notices and Cautions	6
Section 1 Web-based Switch Configuration	7
Chapter 1 Introduction	7
Chapter 2 Login to the Web Manager	7
Chapter 3 Web-based User Interface	8
Areas of the User Interface	8
Chapter 4 Web Pages	9
Section 2 LAN	11
Chapter 1 System Configuration	11
Device Information	11
System Information Settings	12
Port Configuration	12
PoE	16
Serial Port Settings	19
Warning Temperature Settings	19
System Log Configuration	20
Time Range Settings	23
Port Group Settings	24
Time Settings	24
User Accounts Settings	25
Command Logging Settings	26
Chapter 2 Management	27
ARP	27
Gratuitous ARP	28
IPv6 Neighbor Settings	30
IP Interface	31
Management Settings	35
Session Table	36
Single IP Management	37
SNMP Settings	46
Telnet Settings	55
Web Settings	55
Chapter 3 L2 Features	56
VLAN	56
QinQ	74
Spanning Tree	77
Link Aggregation	84
FDB	87
L2 Multicast Control	91
Multicast Filtering	113
ERPS Settings	118
LLDP	121
NLB FDB Settings	130
Chapter 4 L3 Features	131
IPv4 Static/Default Route Settings	131
IPv4 Route Table	132
IPv6 Static/Default Route Settings	132
IP Forwarding Table	133
VRRP	133
Chapter 5 QoS	138
802.1p Settings	139
Bandwidth Control	141
Traffic Control Settings	143
DSCP	145
HOL Blocking Prevention	147
Scheduling Settings	147
Chapter 6 ACL	150
ACL Configuration Wizard	150
Access Profile List	151
CPU Access Profile List	167
ACL Finder	181
ACL Flow Meter	181
Egress Access Profile List	184
Egress ACL Flow Meter	196
Chapter 7 Security	199
802.1X	199
RADIUS	211
IP-MAC-Port Binding (IMPB)	215
MAC-based Access Control (MAC)	220
Compound Authentication	223
Port Security	226
ARP Spoofing Prevention Settings	228
BPDU Attack Protection	229
Loopback Detection Settings	230
Traffic Segmentation Settings	231
NetBIOS Filtering Settings	232
DHCP Server Screening	233
Access Authentication Control	235
SSL Settings	243
SSH	245
Trusted Host Settings	249
Safeguard Engine Settings	249
Captive Portal (CP)	251
Chapter 8 Network Application	271
DHCP	271
SNTP	277
Flash File System Settings	279
Chapter 9 OAM	281
CFM	281
Ethernet OAM	291
Cable Diagnostics	295
Chapter 10 Monitoring	297
Utilization	297
Statistics	298
Received (RX)	299
UMB_Cast (RX)	300
Transmitted (TX)	302
Received (RX)	303
Transmitted (TX)	305
Mirror	308
sFlow	310
Ping Test	313
Trace Route	314
Peripheral	315
Chapter 11 Save and Tools	316
Section 3 WLAN	317
Chapter 1 Security	317
Captive Portal (CP)	317
Chapter 2 Monitoring	336
Global	336
Peer Switch	344
Access Point	347
Client	368
QoS	387
Chapter 3 Administration	395
Basic Setup	395
AP Management	407
Advanced Configuration	416
Chapter 4 QoS	443
Access Control Lists	443
Differentiated Services	456
Chapter 5 Network Visualization	462
Download Image	462
Launch…	462
Section 4 Save and Tools	465
Chapter 1 Save	465
Save Configuration / Log	465
Chapter 2 Tools	466
License Management	466
Download Firmware	466
Upload Firmware	467
Download Configuration	467
Upload Configuration	468
Upload Log File	469
Reset	470
Reboot System	471
Appendices	473
Appendix A Mitigating ARP Spoofing Attacks Using Packet Content ACL	473
Appendix B Password Recovery Procedure	479
Appendix C System Log Entries	480
Appendix D Trap Log Entries	491
Appendix E RADIUS Attributes Assignment	495

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DWS-3160 Series Gigabit Ethernet Unified Switch Web UI Reference Guide

266

Chapter 8

Network Application

DHCP

SNTP

Flash File System Settings

DHCP

DHCP Relay

DHCP Relay Global Settings

This window is used to enable and configure DHCP Relay Global Settings. The relay hops count limit allows the

maximum number of hops (routers) that the DHCP messages can be relayed through to be set. If a packet’s hop

count is more than the hop count limit, the packet is dropped. The range is between

and

hops, with a default

value of

. The relay time threshold sets the minimum time (in seconds) that the Switch will wait before forwarding

a BOOTREQUEST packet. If the value in the seconds’ field of the packet is less than the relay time threshold, the

packet will be dropped. The range is between

and

65,535

seconds, with a default value of

seconds.

To view this window, click

Network Application > DHCP > DHCP Relay > DHCP Relay Global Settings

shown below:

Figure 12-1 DHCP Relay Global Settings window

The fields that can be configured are described below:

Parameter

Description

DHCP Relay State

Use the drop-down menu to enable or disable the DHCP Relay service on the

Switch. The default is

Disabled.

DHCP Relay Hops

Count Limit (1-16)

Enter an entry between

and

to define the maximum number of router hops

DHCP messages can be forwarded. The default hop count is

DHCP Relay Time

Threshold (0-65535)

Enter an entry between

and

65535

seconds, and defines the maximum time limit

for routing a DHCP packet. If a value of

is entered, the Switch will not process the

value in the seconds’ field of the DHCP packet. If a non-zero value is entered, the

Switch will use that value, along with the hop count to determine whether to forward

a given DHCP packet.

DHCP Relay Option 82

State

Use the drop-down menu to enable or disable the DHCP Relay Agent Information

Option 82 on the Switch. The default is

Disabled.

Enabled

–When this field is toggled to

Enabled

, the relay agent will insert and

remove DHCP relay information (option 82 field) in messages between DHCP

servers and clients. When the relay agent receives the DHCP request, it adds the

option 82 information, and the IP address of the relay agent (if the relay agent is