66CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS
21Choose whether or not you want users on the LAN to be able to access the Internet through your private network’s direct Internet connection, if your private network allows you this option.
22Choose whether or not you would like to use PPP Data Compression when transferring data.
23For Network Address Translation (NAT), your choice depends upon the IP addressing scheme (dynamic or static) used by the private network into which you will be dialing. Follow this rule of thumb:
■If you performed the IP Address check in Chapter 3 and optimized your computer for use with dynamic IP addressing or found that it was already optimized, choose Yes to leave NAT enabled
■If you performed the IP Address check and set up your computer for static IP addressing, according to the instructions in “Setting Up Your Computer If You Have a Static IP Address,” then choose No to disable NAT.
With NAT enabled, the LAN Modem makes translations between a single IP address issued by the private network to the LAN Modem and individual IP addresses of the computers on the LAN (assigned by the LAN Modem). This translation allows multiple users on the LAN to access the private network by appearing to be a single connection with a single IP address. To better understand how NAT translation works, refer to the description of NAT in Appendix A, “Networking Primer.”
24In the WAN Link IP Address and Subnet mask fields, if the private network to which you are connecting requires a static IP address and subnet mask, enter those values here. Otherwise, leave these fields empty.
25For Allow Automatic Call Initiation, leave the default setting which is Yes.
If you select No, you will have to manually launch a call to this service provider every time you want to connect. You may want to change this field to No later on if you find that calls are being connected unintentionally as a result of packets generated by other computers on the LAN.
26For Enable Intelligent NAT, leave the default setting, which is Yes, in order for the LAN Modem to better support Internet applications and games.
The LAN Modem delivers all unsolicited TCP/UDP packets to the workstation that is currently communicating with the remote host that has generated these packets. If you set this field to No, all unsolicited TCP/UDP packets are delivered to the default workstation.
27In the Default Workstation for Incoming Packets field, specify the workstation to which all unsolicited TCP/UDP packets should be delivered.
Note that if the Enable Intelligent NAT field is set to Yes, the LAN Modem first attempts to deliver the unsolicited TCP/UDP packets to the workstation that is currently communicating with the remote host that has generated these packets. Only if no such workstation is found are the packets delivered to the specified default workstation.
28Advanced users can review or make changes to the V.90 modem settings associated with this service provider by clicking Modem Settings. To leave these values set to their default settings (recommended), click Submit. For information on changing these settings, refer to “Configuring V.90 Modem Control Parameters”
