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DNS Relay Global Settings, Domain Name Resolution

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xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide Domain Name Resolution The domain name system can be used by contacting the name servers one at a time, or by asking the domain name system to do the complete name translation. The client makes a query containing the name, the type of answer required, and a code specifying whether the domain name system should do the entire name translation, or simply return the address of the next DNS server if the server receiving the query cannot resolve the name. When a DNS server receives a query, it checks to see if the name is in its sub domain. If it is, the server translates the name and appends the answer to the query, and sends it back to the client. If the DNS server cannot translate the name, it determines what type of name resolution the client requested. A complete translation is called recursive resolution and requires the server to contact other DNS servers until the name is resolved. Iterative resolution specifies that if the DNS server cannot supply an answer, it returns the address of the next DNS server the client should contact. Each client must be able to contact at least one DNS server, and each DNS server must be able to contact at least one root server. The address of the machine that supplies domain name service is often supplied by a DHCP or BOOTP server, or can be entered manually and configured into the operating system at startup. DNS Relay Global Settings To configure the DNS function on the Switch, click Network Application > DNS > DNS Relay > DNS Relay Global Settings, as shown below: Figure 9-20 DNS Relay Global Settings window The fields that can be configured are described below: Parameter Description DNS Relay Status This field can be toggled between Disabled and Enabled using the pull-down menu, and is used to enable or disable the DNS Relay service on the Switch. Primary Name Server Allows the entry of the IP address of a primary domain name server (DNS). Secondary Name Server Allows the entry of the IP address of a secondary domain name server (DNS). DNS Relay Cache Status This can be toggled between Disabled and Enabled. This determines if a DNS cache will be enabled on the Switch. DNS Relay Static Table State This field can be toggled using the pull-down menu between Disabled and Enabled. This determines if the static DNS table will be used or not. Click Apply to implement changes made. 288

Section	Page
Intended Readers	10
Typographical Conventions	10
Notes, Notices and Cautions	10
Chapter 1 Web-based Switch Configuration	11
Introduction	11
Login to the Web Manager	11
Web-based User Interface	12
Web Pages	13
Chapter 2 System Configuration	14
Device Information	14
System Information Settings	15
Dual Configuration Settings	16
Firmware Information Settings	17
Port Configuration	18
PoE	21
Serial Port Settings	24
System Log configuration	25
Time Range Settings	29
Time Settings	29
User Accounts Settings	30
Stacking	31
Chapter 3 Management	35
ARP	35
Gratuitous ARP	37
IPv6 Neighbor Settings	38
IP Interface	39
Management Settings	43
Session Table	44
Single IP Management	44
SNMP Settings	54
Telnet Settings	64
Web Settings	64
Chapter 4 L2 Features	65
VLAN	65
Q-in-Q	88
Layer 2 Protocol Tunneling Settings	90
Spanning Tree	91
Link Aggregation	100
FDB	103
L2 Multicast Control	107
Multicast Filtering	132
ERPS Settings	136
LLDP	139
Chapter 5 L3 Features	149
Local Route Settings	149
IPv4 Static/Default Route Settings	149
IPv4 Route Table	150
IPv6 Static/Default Route Settings	151
IPv6 Route Table	151
Policy Route Settings	152
IP Forwarding Table	153
Chapter 6 QoS	154
802.1p Settings	156
Bandwidth Control	159
Traffic Control Settings	161
DSCP	164
HOL Blocking Prevention	167
Scheduling Settings	168
SRED	171
Chapter 7 ACL	174
ACL Configuration Wizard	174
Access Profile List	175
CPU Access Profile List	193
ACL Finder	207
ACL Flow Meter	208
Chapter 8 Security	211
802.1X	211
RADIUS	224
IP-MAC-Port Binding (IMPB)	229
MAC-based Access Control (MAC)	236
Web-based Access Control (WAC)	240
Japanese Web-based Access Control (JWAC)	245
Compound Authentication	252
Port Security	256
ARP Spoofing Prevention Settings	258
BPDU Attack Protection	259
Loopback Detection Settings	261
Traffic Segmentation Settings	262
NetBIOS Filtering Settings	263
DHCP Server Screening	264
Access Authentication Control	265
SSL Settings	274
SSH	276
Trusted Host Settings	280
Safeguard Engine Settings	281
Chapter 9 Network Application	284
DHCP	284
DNS	296
PPPoE Circuit ID Insertion Settings	298
SNTP	299
Chapter 10 OAM	302
CFM	302
Ethernet OAM	311
DULD Settings	315
Cable Diagnostics	316
Chapter 11 Monitoring	318
Utilization	318
Statistics	320
Mirror	332
sFlow	334
Ping Test	337
Trace Route	338
Peripheral	340
Chapter 12 Save and Tools	341
Save Configuration ID 1	341
Save Configuration ID 2	341
Save Log	342
Save All	342
Stacking Information	342
Download Firmware	344
Download Configuration File	344
Upload Configuration File	345
Upload Log File	346
Reset	347
Reboot System	347
Appendix A Mitigating ARP Spoofing Attacks Using Packet Content ACL	348
How Address Resolution Protocol Works	348
How ARP Spoofing Attacks a Network	350
Prevent ARP Spoofing via Packet Content ACL	351
Configuration	351
Appendix B System Log and Trap List	354
System Log Entries	354
DES-3528/DES-3552 Series Trap List	362
Proprietary Trap List	362
Appendix C Password Recovery Procedure	365

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xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide

Domain Name Resolution

The domain name system can be used by contacting the name servers one at a time, or by asking the domain name

system to do the complete name translation. The client makes a query containing the name, the type of answer

required, and a code specifying whether the domain name system should do the entire name translation, or simply

return the address of the next DNS server if the server receiving the query cannot resolve the name.

When a DNS server receives a query, it checks to see if the name is in its sub domain. If it is, the server translates the

name and appends the answer to the query, and sends it back to the client. If the DNS server cannot translate the

name, it determines what type of name resolution the client requested. A complete translation is called recursive

resolution and requires the server to contact other DNS servers until the name is resolved. Iterative resolution specifies

that if the DNS server cannot supply an answer, it returns the address of the next DNS server the client should contact.

Each client must be able to contact at least one DNS server, and each DNS server must be able to contact at least one

root server.

The address of the machine that supplies domain name service is often supplied by a DHCP or BOOTP server, or can

be entered manually and configured into the operating system at startup.

DNS Relay Global Settings

To configure the DNS function on the Switch, click

Network Application > DNS > DNS Relay > DNS Relay Global

Settings

, as shown below:

Figure 9-20 DNS Relay Global Settings window

The fields that can be configured are described below:

Parameter

Description

DNS Relay Status

This field can be toggled between

Disabled

and

Enabled

using the pull-down menu, and is

used to enable or disable the DNS Relay service on the Switch.

Primary Name Server

Allows the entry of the IP address of a primary domain name server (DNS).

Secondary Name

Server

Allows the entry of the IP address of a secondary domain name server (DNS).

DNS Relay Cache

Status

This can be toggled between

Disabled

and

Enabled.

This determines if a DNS cache will

be enabled on the Switch.

DNS Relay Static

Table State

This field can be toggled using the pull-down menu between

Disabled

and

Enabled.

This

determines if the static DNS table will be used or not.

Click

Apply

to implement changes made.

288