Chapter 6 LAN Setup
P-791R v2 User’s Guide
84
6.1.2 DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual
clients to obtain TCP/IP configuration at start-up from a server. You can configure the ZyXEL
Device as a DHCP server or disable it. When configured as a server, the ZyXEL Device
provides the TCP/IP configuration for the clients. If you turn DHCP service off, you must
have another DHCP server on your LAN, or else the computer must be manually configured.
6.1.2.1 IP Pool Setup
The ZyXEL Device is pre-configured with a pool of IP addresses for the DHCP clients (DHCP
Pool). See the product specifications in the appendices. Do not assign static IP addresses from
the DHCP pool to your LAN computers.
6.1.3 DNS Server Address
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address
and vice versa. The DNS server is extremely important because without it, you must know the
IP address of a machine before you can access it. The DNS server addresses that you enter in
the DHCP setup are passed to the client machines along with the assigned IP address and
subnet mask.
There are two ways that an ISP disseminates the DNS server addresses. The first is for an ISP
to tell a customer the DNS server addresses, usually in the form of an information sheet, when
s/he signs up. If your ISP gives you the DNS server addresses, enter them in the
DNS Server
fields in
DHCP Setup
, otherwise, leave them blank.
Some ISP’s choose to pass the DNS servers using the DNS server extensions of PPP IPCP (IP
Control Protocol) after the connection is up. If your ISP did not give you explicit DNS servers,
chances are the DNS servers are conveyed through IPCP negotiation. The ZyXEL Device
supports the IPCP DNS server extensions through the DNS proxy feature.
If the
Primary
and
Secondary DNS Server
fields in the
DHCP Setup
screen are not
specified, for instance, left as
0.0.0.0
, the ZyXEL Device tells the DHCP clients that it itself is
the DNS server. When a computer sends a DNS query to the ZyXEL Device, the ZyXEL
Device forwards the query to the real DNS server learned through IPCP and relays the
response back to the computer.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances.
If your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup
screen. This way, the ZyXEL Device can pass the DNS servers to the computers
and the computers can query the DNS server directly without the ZyXEL Device’s
intervention.
6.1.4 DNS Server Address Assignment
Use DNS (Domain Name System) to map a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a computer before you can access it.
There are two ways that an ISP disseminates the DNS server addresses.
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Страница 7: ...Safety Warnings P 791R v2 User s Guide 7 This product is recyclable Dispose of it properly...
Страница 8: ...Safety Warnings P 791R v2 User s Guide 8...
Страница 20: ...Table of Contents P 791R v2 User s Guide 20...
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Страница 46: ...Chapter 2 Introducing the Web Configurator P 791R v2 User s Guide 46...
Страница 53: ...Chapter 3 Wizard Setup for Internet Access P 791R v2 User s Guide 53...
Страница 54: ...Chapter 3 Wizard Setup for Internet Access P 791R v2 User s Guide 54...
Страница 58: ...Chapter 4 Point to point Configuration P 791R v2 User s Guide 58...
Страница 59: ...59 PART II Network Setup WAN Setup 61 LAN Setup 83 Network Address Translation NAT Screens 93...
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Страница 82: ...Chapter 5 WAN Setup P 791R v2 User s Guide 82...
Страница 104: ...Chapter 7 Network Address Translation NAT Screens P 791R v2 User s Guide 104...
Страница 105: ...105 PART III Security Filter 107...
Страница 106: ...106...
Страница 110: ...110...
Страница 114: ...Chapter 9 Static Route P 791R v2 User s Guide 114...
Страница 118: ...Chapter 10 Dynamic DNS Setup P 791R v2 User s Guide 118...
Страница 128: ...Chapter 11 Remote Management Configuration P 791R v2 User s Guide 128...
Страница 140: ...Chapter 12 Universal Plug and Play UPnP P 791R v2 User s Guide 140...
Страница 141: ...141 PART V Maintenance System 143 Logs 149 Tools 153 Diagnostic 159...
Страница 142: ...142...
Страница 148: ...Chapter 13 System P 791R v2 User s Guide 148...
Страница 158: ...Chapter 15 Tools P 791R v2 User s Guide 158...
Страница 162: ...162...
Страница 168: ...Chapter 17 Introducing the SMT P 791R v2 User s Guide 168...
Страница 172: ...Chapter 18 General Setup P 791R v2 User s Guide 172...
Страница 178: ...Chapter 19 WAN Setup P 791R v2 User s Guide 178...
Страница 194: ...Chapter 22 Remote Node Setup P 791R v2 User s Guide 194...
Страница 198: ...Chapter 23 Static Route Setup P 791R v2 User s Guide 198...
Страница 226: ...Chapter 25 Filter Configuration P 791R v2 User s Guide 226...
Страница 228: ...Chapter 26 SNMP Configuration P 791R v2 User s Guide 228...
Страница 230: ...Chapter 27 System Password P 791R v2 User s Guide 230...
Страница 240: ...Chapter 28 System Information Diagnosis P 791R v2 User s Guide 240...
Страница 268: ...Chapter 31 IP Routing Policy Setup P 791R v2 User s Guide 268...
Страница 272: ...Chapter 32 Schedule Setup P 791R v2 User s Guide 272...
Страница 278: ...Chapter 33 Troubleshooting P 791R v2 User s Guide 278...
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Страница 285: ...Appendix A Product Specifications P 791R v2 User s Guide 285 Figure 194 Masonry Plug and M4 Tap Screw...
Страница 286: ...Appendix A Product Specifications P 791R v2 User s Guide 286...
Страница 320: ...Appendix E IP Address Assignment Conflicts P 791R v2 User s Guide 320...
Страница 324: ...Appendix F Common Services P 791R v2 User s Guide 324...
Страница 330: ...Appendix G Command Interpreter P 791R v2 User s Guide 330...
Страница 342: ...Appendix H Log Descriptions P 791R v2 User s Guide 342...
Страница 348: ...Appendix J Legal Information P 791R v2 User s Guide 348...
Страница 354: ...Appendix S Customer Support P 791R v2 User s Guide 38...