3Com 3C892 - OfficeConnect ISDN Lan Modem Router User Manual

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Contents

3Com 3C892 - OfficeConnect ISDN Lan Modem Router User Manual Manual pdf 64 page image

66 CHAPTER 6: ADVANCED CONFIGURATIONIP Address and Subnet MaskThe IP address is a unique address which identifies the ISDN LAN Modem on anetwork. The default address (192.168.1.1) is a private IP address which will betranslated automatically by the ISDN LAN Modem for Internet access. You shouldleave the default unless you are certain that this value must be changed.The ISDN LAN Modem attempts to use its default IP address to communicate withthe computer. If communication cannot be established, the ISDN LAN Modem willchange its default IP address. If this occurs, the IP address shown in Figure 46 andthe subnet mask will be different.The subnet mask identifies the subnetwork to which your computer is connected.You should leave the default unless you are certain that this value must bechanged.WARNING: If you change the IP address and/or the subnet mask, the ISDN LANModem will re-initialize itself to make the new settings work. All calls will beterminated and you may need to reconfigure the IP addresses of the computersconnected to the ISDN LAN Modem. For a LAN using static IP addresses, you mustmanually reconfigure the IP addresses of the workstations on the LAN via theWorkstation Parameters window. For a LAN using dynamic IP addresses, if youhave Windows 98 or 95, launch Winipcfg.exe (probably located in your Windowsdirectory), click Release All and then click Renew All.Local Domain NameThe local domain name identifies your LAN. LAN refers to the network created bythe ISDN LAN Modem and the devices attached to it.Enable DHCP ServerThe ISDN LAN Modem provides DHCP server functionality for the LAN whichautomatically assigns a network or IP address to a newly attached workstation onan IP network. If another device on your LAN is providing this functionality, or ifyou are using static IP addresses, then you should disable the DHCP server.Enable NetBIOS FilteringFor Windows Users: NetBIOS is primarily used by Windows 98, 95 and NT for localfile and printer sharing, note that NetBIOS may also be used on other operatingsystems. This protocol can make spurious DNS requests which can inadvertentlycause the LAN Modem to establish unwanted calls to your Service Provider andresults in subsequent charges to your phone bill. When this box is checked,NetBIOS packets cannot initiate a call, but they will be passed if the call is alreadyestablished. If you have no need to perform file or printer sharing over your ISDNconnection, you should enable NetBIOS filtering (that is, check the box). Note thatenabling the NetBIOS filter will not affect your ability to share files and printersover your LAN. NetBIOS filtering is disabled by default.