Billion Electric Company 5100S user manual DNS Server Address Assignment, Factory LAN Defaults

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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 BIPAC 5100S supports the IPCP DNS server extensions through the DNS proxy feature.

If the Primary and Secondary DNS Server fields in DHCP Setup are not specified, for instance, left as 0.0.0.0, the BIPAC 5100S tells the DHCP clients that it itself is the DNS server. When a computer sends a DNS query to the BIPAC 5100S, the BIPAC 5100S 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 menu. This way, the BIPAC 5100S can pass the DNS servers to the computers and the computers can query the DNS server directly without the BIPAC 5100S’s intervention.

4.3 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.

1.The ISP tells you the DNS server addresses, usually in the form of an information sheet, when you sign up. If your ISP gives you DNS server addresses, enter them in the DNS Server fields in DHCP Setup.

2.Leave the DNS Server fields in DHCP Setup blank (for example 0.0.0.0). The BIPAC 5100S acts as a DNS proxy when this field is blank.

4.4 LAN TCP/IP

The BIPAC 5100S has built-in DHCP server capability that assigns IP addresses and DNS servers to systems that support DHCP client capability.

4.4.1 Factory LAN Defaults

The LAN parameters of the BIPAC 5100S are preset in the factory with the following values: IP address of 192.168.1.254 with subnet mask of 255.255.255.0 (24 bits)

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Contents Bipac 5100S Table of Contents LAN TCP/IP Appendix Getting to Know the Bipac 5100S Features of the Bipac 5100SIntroducing the Bipac 5100S Multiple PVC Permanent Virtual Circuits Support Multiplexing Applications for the Bipac 5100S Web Configurator Overview Introducing the Web ConfiguratorAccessing the Bipac 5100S Web Configurator Navigating the Bipac 5100S Web Configurator Resetting the Bipac 5100S Configuring PasswordUsing The Reset Button Wizard Setup Introduction Wizard SetupEncapsulation PPP over Ethernet4 RFC Wizard Setup Configuration First ScreenMultiplexing VC-based MultiplexingOr PPPoE IP Address and Subnet MaskIP Assignment with PPPoA or PPPoE Encapsulation IP Address AssignmentIP Assignment with RFC 1483 Encapsulation IP Assignment with Enet Encap EncapsulationPrivate IP Addresses Wizard Setup Configuration Second ScreenNailed-Up Connection PPP NATPPPoE 10.2 RFC Enet Encap Exactly as given IP Pool Setup Dhcp SetupWizard Setup Configuration Third Screen Dhcp Test Your Internet Connection Wizard Setup Configuration Connection TestsLAN Overview LAN SetupLANs, WANs and the Bipac 5100S DNS Server AddressDNS Server Address Assignment Factory LAN DefaultsMulticast RIP SetupConfiguring LAN TCP/IP WAN Overview WAN SetupPPPoE Encapsulation Pptp EncapsulationTraffic Shaping Configuring WAN SetupPPP Half Bridge When to use Half Bridge modeFollowing table describes the labels in this screen PPPoE Encap in the Encapsulation field NAT Overview Network Address Translation NATNAT Definitions What NAT DoesNAT Application How NAT WorksType IP Mapping NAT Mapping TypesSUA Single User Account Versus NAT Port Forwarding Services and Port NumbersSUA Server Services Port Number Configuring Servers Behind SUA ExampleConfiguring SUA Server Selecting the NAT ModeConfiguring Address Mapping Many-to-One and Server mapping types Editing an Address Mapping Rule NAT Address Mapping Rules screen Dyndns Wildcard Configuring Dynamic DNS Dynamic DNS SetupDynamic DNS Following table describes the labels in this screen Configuring Time Zone Time and Date SetupPage System Timeout Remote Management ConfigurationRemote Management Overview Remote Management LimitationsTelnet Configuring Remote ManagementFTP WebLabel Description Universal Plug-and-Play UPnP How do I know if Im using UPnP?Universal Plug and Play Overview NAT TraversalInstalling UPnP in Windows Example Configuring UPnPInstalling UPnP in Windows Me Installing UPnP in Windows XP Page Auto-discover Your UPnP-enabled Network Device Using UPnP in Windows XP ExampleWeb Configurator Easy Access Page Maintenance Overview MaintenanceSystem Status Screen Following table describes the labels in this screen System Statistics Dhcp Table Screen Diagnostic General Screen Diagnostic ScreensDiagnostic DSL Line Screen Reset Adsl Line Firmware Screen Page Using LEDs to Diagnose Problems TroubleshootingPower LED Cannot telnet into the Bipac 5100S Web ConfiguratorLAN Interface Login Username and PasswordWAN Interface Remote Management Internet AccessCannot connect to a remote node or ISP Remote Node Connection
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