1-8CHAPTER 1: OVERVIEW

with an IP address for the workstation and the IP addresses of the default router and Domain Name Server.

The OfficeConnect Remote 840 can be configured to be a DHCP Server, with a pool of up to 40 IP addresses.

What is DNS? A Domain Name Server (DNS) provides an IP address to a host computer for a given domain name. A DNS Proxy receives requests and attempts to find an entry in its local tables, and if one is not found, forwards the request to a remote DNS Server. The remote DNS Server can be learned dynamically through PPP or can be statically assigned.

The OfficeConnect Remote 840 can be configured as a DNS proxy. A static local host entry of ocrdsl-3com.comis configured for the OfficeConnect Remote 840 by default. Therefore, the OfficeConnect Remote 840 can be easily accessed with a web browser, by typing in ocrdsl-3com.comin the location or address field in the browser.

In unconfigured mode, ocrdsl-3com.comis not configured by default. In this mode, you will have to configure a static host entry.

What is Address Address Translation allows private network addresses to be mapped into

Translation? public addresses. The OfficeConnect Remote 840 provides two methods for mapping private, non-registered LAN IP addresses to the public Internet address(es) used for a wide-area connection. The two methods are:

Network Address Translation (NAT). NAT simply substitutes public IP addresses for private IP addresses.

Port Address Translation (PAT). PAT allows sessions from multiple private IP addresses to use a single public IP address.

NAT and PAT can be configured for each remote site.

What is DHCP

To simplify the installation process, the OfficeConnect Remote 840 can be

Smart Mode?

initialized with a set of pre-configured parameters. This operational mode

 

is referred to as DHCP Smart Mode. In DHCP Smart Mode, the unit will

 

automatically be assigned an IP address and will provide a pool of IP

 

addresses to be assigned to each workstation attached to the LAN. When

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3Com 3C840 manual What is Dhcp, Smart Mode?, NAT and PAT can be configured for each remote site