3Com OfficeConnect 3CR856-95 User Manual

Also see for OfficeConnect 3CR856-95: Installation guide User guide

Contents

36network’s subnet. The default IP Address of the Gateway is192.168.1.1.When you change the IP Address of the Gateway you mustreboot all computers that gain their IP address from the Gatewaybefore they will be able to access the Internet.If you are using static addresses for your PCs you must alter thenetwork configuration on each PC so that they have an IPaddress within the same subnet as the Gateway and have theirdefault Gateway set as the Gateway’s IP address.If you reconfigure your network you may need to change yourSubnet Mask. The Subnet Mask detemines how many addressesare available to your network. The default Subnet Mask is255.255.255.0.For example if the IP Address of your Gateway is 192.168.1.1and the Subnet Mask of your network is 255.255.255.0 thenyour network can have a maximum of 254 addresses from192.168.1.1 to 192.168.1.254 (192.168.1.0 and 192.168.1.255are reserved by the subnet and are not available for use).When you change the IP Address or Subnet Mask of theGateway you should review the DHCP Server settings asdescribed below.Changing the DHCP Server SettingsThis section allows to you enable, disable and configure thesettings of the Gateway’s DHCP server.If you intend to use the Gateway to control the permissions ofindividual machines on your network then you must use theGateway’s DHCP server to allocate addresses (or use staticaddressing). If you use another DHCP server you may getunexpected results. See “PC Privileges” on page 45.To enable the DHCP Server ensure that the Enable check box isticked. To disable the DHCP Server ensure that the Enable checkbox is cleared.Set the IP Pool Start Address and IP Pool End Address to the firstand last address you want the Gateway to allocate to computers.The IP address pool must be contained within the subnet asdefined in “Changing the LAN settings” on page 35. The defaultstart and end addresses are 192.168.1.100 and 192.168.1.200.If you have a WINS Server on your network enter its IP address inthe WINS Server box. The gateway will pass this information onto all Windows PCs that obtain an address from its DHCP server.If you will be using One-to-One NAT you must set up a rangethat is one less than the number of public addresses allocated toyou by your ISP. The DHCP range must also be identical to therange specified when you set up One-to-One NAT. See “Settingup One-to-One NAT” on page 42.DHCP Clients ListThe DHCP Clients screen provides details of the devices that havebeen given IP addresses by the Gateway’s DHCP server. For eachdevice that has been granted a lease, the IP address, Host Nameand MAC address of that device is displayed.dua08569-5aaa01.book Page 36 Wednesday, March 13, 2002 10:39 AM