- 124 -Changing Network Settings From the Web Page4 4. Network SettingsEncrypting Communication byIPSecYou can encrypt communication between yourcomputer and the printer.The communication is encrypted by IPSec. WhenIPSec is enabled, encryption is applied for all theapplications using IP protocols.You can specify up to 50 hosts by their IPaddresses. When a host that is not registeredtries to access the printer, it is rejected. Whenyou try to access a host that is not registered,the attempt is invalid.Be sure to configure the printer beforeconfiguring your computer.Memo● You must have a pre-shared key readied in advance.Configuring Your PrinterIn order to enable IPSec, your printer must firstbe configured from the web page.Note● When you enable IPSec, communication with a host notspecified in this procedure is rejected.Memo● Be sure to make a note of the values you specify in thesesteps. They are necessary when you configure the IPSecsettings on your computer.1 Access the printer’s web page and log inas the administrator.2 Select [Admin Setup].3 Select [Network Setup] > [Security]> [IPSec].4 Follow the on-screen instructions tospecify detailed settings.Memo● Either [ESP] or [AH] must be enabled in theconfiguration for "Phase2 Proposal".5 Click [Submit].The network card reboots to enable the newsettings.Note● If you were unable to set up IPSec because of aninconsistency between the parameters that werespecified, you will be unable to access the web page. Inthis case, either disable IPSec from the operator panel ofthe printer, or initialize the network settings.Configuring Your ComputerMemo● Be sure to configure the printer before configuring yourcomputer.1 Click [Start] and select [ControlPanel]>[Administrative Tools].2 Double-click [Local Security Policy].3 On the [Local Security Policy] window,click [IP Security Policies on LocalComputer].4 From the [Action] menu, select [CreateIP Security Policy].5 On the [IP Security Policy Wizard],click [Next].6 Enter a [Name] and a [Description]and then click [Next].7 Deselect the [Activate the defaultresponse rule (earlier versions ofWindows only)] check box and thenclick [Next].8 Select [Edit Properties] and then click[Finish].9 On the IP security policy propertieswindow, select the [General] tab.10 Click [Settings].11 On the [Key Exchange Settings]window, enter a value (minutes) for[Authenticate and generate a newkey after every].Note● Specify the same value as [Lifetime] specified in theconfiguration for "Phase1 Proposal" in “ConfiguringYour Printer” P.124. Although [Lifetime] is specifiedin seconds, enter a value in minutes for this step.12 Click [Methods].13 On the [Key Exchange SecurityMethods] window, click [Add].14 Specify [Integrity algorithm],[Encryption algorithm] and [Diffie-Hellman group].Note● Select the same value that was specified in [IKEEncryption Algorithm], [IKE Hush Algorithm],and [Diffie-Hellman group] at the time of