IBM Software Technical Document

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Document Information

Document Number:	12603157
Functional Area:	Communications-TCP
Subfunctional Area:	Remote Access Services
Sub-Subfunctional Area:	PPP
OS/400 Release:	V4R4M0; V4R5M0; V5R1M0; V5R2M0
Product:	TCP/IP UTILITIES (5769TC100)
Product Release:	N/A

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Document Title
Configuring PPP Dial Profile Using Client Access V3R2M0 or Earlier Release

Document Description
Starting at R420, the customer has the choice of using Point-to-Point (PPP) for their dial-up connection. This document provides basic information to assist users that have some general familiarity with Serial Line Internet Protocol (SLIP), but have not worked with PPP. Previous knowledge on creating line descriptions and configuring TCP on the IBM® OS/400® system is assumed.

This presentation covers the following:

o	Hardware/Software requirements
o	Creating a Line Description
o	Setting up a *DIAL profile
o	Basic Debug of common problems and document collection

Requirements

The requirements for PPP are similar to SLIP, but there are two main differences the user needs to be aware of:

You must have one of the following IOAs to use PPP on your system (this can be verified by doing a WRKHDWRSC *CMN):

o	2699 - - Two-line WAN IOA
o	2720 - - PCI WAN/Twinaxial IOA
o	2721 - - PCI Two-line WAN IOA
o	2745 - - PCI Two-line WAN IOA
o	2750 - - PCI ISDN BRI U IOA (2-wire interface)
o	2751 - - PCI ISDN BRI S/T IOA (4-wire interface)
o	2761 - - 8 port analog modem IOA
o	2771 - - Internal analog modem

Secondly, the user must also have Client Access Operations Navigator under Windows 95/NT/2000 to fully configure PPP or SLIP at the R420 or higher level. A Client Access license is not needed, but the user needs the base load of Client Access to access the Operations Navigator portion.

1.0 Configuring a New *DIAL PPP Profile

1.1 Follow the steps below for Figure 1A:

o	Start Operations Navigator on the PC
o	Double-click on OS/400 Server
o	Double-click on Network
o	In the right pane, right-click on Connections Profiles, and select New Profile as below:

Figure 1A

1.2 For the new Point-to-Point Properties General tab (Figure 1B) the following parameters are required:

o	Name: Specifies the name of the Transmission Control Protocol/Internet Protocol (TCP/IP) point-to-point connection profile.
o	Description: Specifies a text description that will help you remember the properties and purpose of the OS/400 profile.
o	Type: The type of TCP/IP dial-up protocol that will be used.
o	Mode: Specifies the type of line required (switched or dedicated). If the same modem is to be used for incoming and outgoing communications, two connection profiles for that modem are needed. However, only one connection profile can use the line at a time. For this dial-up example, we are using switched line-dial. This mode can dial into the remote system from the OS/400 system using this connection profile.

Figure 1B

1.3 For the new Point-to-Point Properties Connection tab (Figure 1C), a line description must be created or selected. To create a line description, one of the following parameters is required:

o

Remote phone numbers Lists the phone numbers of the remote systems. Up to three remote phone numbers can be added. If this is a phone number for an ISDN connection, the number identifies the ISDN B-channel device to be called. To add a phone number click Add. To remove a phone number, select it in the list, and click Remove.

o

Line name Specifies a specific PPP line to be used by this connection profile. Note that you can associate multiple connection profiles with a line; however, only one profile can be active at a given time. The lines in the list match the protocol type (PPP or SLIP) which you set on the General Tab. In addition for V.25bis lines, only those PPP lines that have an appropriate connection type (switched line-answer and switched line-dial) appear in the list. For this example, we selected a line name of NEWPPPDAIL.

Note: If line has been preconfigured, make this selection from the pull-down list.



Figure 1C

1.3.1 For the New Line Properties General Tab (Figure 2A), the following parameters are required:

o	Description: Specifies a text description that helps you remember the properties and purpose of the OS/400 line. Hardware Resource: Lists the current installed adapters available for dial-up connections.
o	Framing: Specifies if the connection is asynchronous or synchronous. If the connection is a switched line, the default is asynchronous. If the connection is a non-switched line, the default is synchronous.

Note: For this example, we used a switched line to a V.24 port. The default framing is asynchronous.


Figure 2A

1.3.2 For the New Line Properties Connection Tab (Figure 2B), the following parameters need to be configured for the dial-up connection.

Dial command type:
Specifies the type of dial command which establishes the connection with the remote system.

Valid options include:

o	None There is no dial command. An automatic call unit establishes the connection. Specify this option if you have a leased line.
o	V25BIS The dial command uses the International Telecommunication Union -Telecommunication (ITU-T) V.25 bis standard.
o	ATCMD The dial command uses the Attention (AT) command set which allows an application to control the modem while it is operating asynchronously. The application must place all AT commands directly into the data stream. The AT commands supported are dependent on the specific modem being used. For this example, we used AT command set.

Figure 2B

1.3.3 For the New Line Properties Link Tab (Figure 2C), the following parameters are required.

o

Line speed Select the line speed in bits per second. The line speed must be compatible with the modem attached to the line. The valid range for a synchronous line is 9600 to 2048000. For an asynchronous line, the possible values are 9600, 19200, 38400, 57600, and 115200. For an asynchronous line on a V.35 interface, the maximum allowed value increases to 230400. For this example, we used 19200. (one speed higher then the actual modem speed).

o

Maximum frame size Specifies the maximum frame size in bytes for the information field in a Point-to-Point Protocol (PPP) frame. The maximum frame size should be greater than or equal to the maximum transmission unit (MTU) for all the connection profiles using this line. Consenting PPP implementations may negotiate other values during connection. Possible values are 1500 through 4096.

Figure 2C

1.3.4 For the New Line Properties Modem Tab (Figure 2D), the following parameter is required.

o	Name Select the name of the modem to use for this line. This associates the physical line and modem. The modem associated with this line is automatically included for a particular connection profile.

Note: Configuring modems that do not appear on this list is handled under a consulting agreement.



Figure 2D

1.4 For the New Point-to-Point Profile Properties TCP/IP Settings (Figure 1D), valid parameters include:

o

Local IP address: Specifies whether the local TCP/IP address is to be a specific TCP/IP address or one dynamically assigned by the remote system. The local TCP/IP address is the address that this connection profile uses for this end of the connection. If you use an Internet Service Provider (ISP), enter information here depending on the service agreement that was set up with the ISP. Options are: o IP address Specifies that an existing TCP/IP address for your local address is used. Select from a list of addresses previously defined to this OS/400 system, or type a new IP address. o Dynamically assign Specifies that the local TCP/IP address is provided dynamically by the remote system. For this example, we specified the remote system will provide the decimal TCP/IP address.

o

Remote IP address: Specifies whether your remote TCP/IP address is to be a specific TCP/IP address or one dynamically assigned by the remote system. The remote TCP/IP address is the address that this connection profile uses for the other end of a connection. If you use an Internet Service Provider (ISP), enter information here depending on the service agreement you have set up with the ISP. Options are: o IP address Specifies that an existing TCP/IP address is used for the address on the remote end of the connection. o Dynamically assign Specifies that the remote TCP/IP address is provided dynamically by the remote system. For this example, we specified that the remote system will provide the decimal TCP/IP address. o Request TCP/IP header compression (VJ) Specifies whether Internet Protocol (IP) is wanted to compress header information after it establishes a connection. Compressing usually increases performance, particularly for interactive traffic or slow serial lines. Header compression follows the Van Jacobson (VJ) method defined in RFC 1332. For PPP, compression is negotiated when the connection is established. If the other end of the connection does not support VJ compression, the OS/400 system establishes a connection that does not use compression.

Figure 1D

1.5 From the Point-to-Point Profile Properties Authentication Tab (Figure 1E), the user names and passwords used for this Point-to-Point Protocol (PPP) connection profile are set. This enables authentication functions for your PPP connection. A connection script is not required for a PPP connection because authentication is negotiated when the connection is established. If authentication is not needed for this connection profile, leave this tab blank. For security purposes, it is highly recommended the same password is not used for a user defined for Challenge Handshake Authentication Protocol (CHAP) and Password Authentication Protocol (PAP).



Figure 1E

1.6 From the New Point-to-Point Profile Properties tab (Figure 1F), define a domain name server used for a connection profile that uses either leased line-initiator or switched line-dial mode. Only one domain name server can be associated with a connection profile.

o	IP address Specifies the TCP/IP address of the domain name server.
o	Dynamically assign Specifies the remote system is to provide, during connection, the TCP/IP address of the domain name server. The remote system provides only the TCP/IP address if it has one.
o	Do not use Specifies not to use a domain name server. Selecting this, the local system uses its host file for address resolution rather than the domain name server.

Figure 1F



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