Configuring PPP settings

1. Select SystemWAN on the Contivity Secure IP Services Gateway menu. The SystemWAN Interfaces screen appears.

Figure 21 SystemWAN Interfaces screen



2. Select the interface that you want to configure by clicking the associated radio button in the Select column and then clicking Configure. The SystemWAN InterfacesConfigure screen appears. The System WAN Configure screen contains information common to all WAN link protocols and interfaces.

Figure 22 SystemWAN InterfacesConfigure screen



3. Enter an optional description of the interface in the Description field.
4. Enter a unique text name in the Circuit ID field.
5. Select an Interface Filter from the drop-down list.
6. Select PPP from the Protocol drop-down list. The default is PPP.
7. Click Configure. The SystemWAN InterfacesConfigureConfigure PPP screen appears. Information about the interface is given at the top of the screen, including the slot number and interface number.

Figure 23 SystemWAN InterfacesConfigure PPP screen



8. Enter a description.
9. Enter the IP address.
10. Specify the remote IP address setting.
11. Select the interface type, public or private.
12. Click PPP Authentication settings to configure the PPP authentication settings for this interface, including Local PAP and CHAP User IDs and Passwords. The SystemWAN InterfacesConfigure PPPAuthentication screen appears. (To configure a CSU/DSU, click Configure CSU/DSU. Refer to "Configuring a T1 CSU/DSU".)

Figure 24 SystemWAN InterfacesConfigure PPPAuthentication screen



13. Select the appropriate authentication type, PAP or CHAP, as required by the ISP. If authentication is not required, select None.
14. The ISP providing the WAN connection to the gateway might require a user ID and password. If so, enter and confirm the password. Click OK to save the settings and return to the Configure PPP screen.
15. You can optionally click Configure PPP Advanced Settings to further configure the PPP interface, including Link Control Protocol (LCP) and IP Control Protocol (IPCP) settings. The PPP Advanced Settings screen appears.

Figure 25 SystemWAN InterfacesConfigure PPPAdvanced Settings screen



16. The Link Control Protocol (LCP ) session negotiates various link options between the gateway and the ISP.
    
    Click Address Control Field Compression to enable Address Control Field Compression, which then compresses the Address Control Field and reduces packet overhead by one byte. Address Control Field compression is Disabled by default.
    
    Click Protocol Field Compression to enable Protocol Field Compression, which then compresses the Protocol Field and reduces packet overhead by one byte. Protocol Field Compression is disabled by default.
    
    Set the Echo Fault Threshold. You can set the number of times LCP attempts an Echo request without receiving a reply. The link is dropped when the number of echo requests exceeds the number in the Echo Fault Threshold box. The range is 0 to 255 (0 indicates disabled); default is 1.
    
    Set the Echo Interval. You can set the Echo request Interval in seconds. Use this interval along with the value of the Echo Fault Threshold box to determine if a link has been disconnected. The range is 0 to 255; default is 0 (disabled).
17. The IP Control Protocol (IPCP) settings allow you to specify certain dial-up networking attributes. Typically, IPCP handles address assignment and configuration of domain name system (DNS) or windows Internet naming service (WINS) server settings.
    
    Set the VJ Negotiation. Click to enable Van Jacobson (VJ) Compression Negotiation VJ Compression compresses the TCP/IP header fields on a per TCP/IP flow basis and reduces packet overhead. VJ Negotiation is disabled by default.
    
    Set the VJ Connect ID Compression Negotiation. Click to enable Van Jacobson (VJ) Connect ID Compression, which then further reduces the VJ compression header and increases packet transmission performance. This option is used only when a single TCP/IP flow is active at any single time over the link. VJ-style TCP/IP header compression identification is Disabled by default.
    
    Set the VJ Max Slots. This is the Maximum number of concurrent VJ-compressed TCP/IP flows. The range is from 2 to 16; default is 8.
18. In the LCP/NCP section of the screen, set the Interface Debug option, if needed. This option, under the Link Control Protocol/Network Control Protocol, sends PPP control packets to the Event log. This is a Nortel Networks internal Customer Support utility that helps diagnose and troubleshoot WAN interface problems.
19. Click OK to save the settings and return to the SystemWAN InterfacesConfigureConfigure PPP screen.

Figure 26 SystemWAN InterfacesConfigure PPPCSU/DSU screen