IBM SC41-5420-04 Manual de usuario

iSeriesTCP/IP Configuration and ReferenceVersion 5SC41-5420-04

viii OS/400 TCP/IP Configuration and Reference V5R1

3 TFTP server programOperation identifierINPUT; BINARY(4) Indicates the operation that the user is attempting toperform. When the application identifi

For operation identifiers 1 through 3, the operation-specific informationcontains the name of the directory or library on which the operation is to be

Table 10. Application Request Validation Operation-Specific InformationOperation Identifier Operation-Specific Information0 NONE if application ID=00

3.If any exception is encountered when calling the exit program, the REXECserver will not allow the operation and the message ″Exception encountered f

Command processor identifierOUTPUT; BINARY(4) Indicates the command processor that you want theserver to use for interpreting and running the command.

If the Qshell Interpreter option of OS/400 is not installed, the REXEC clientreceives (in the stdout stream) a REXEC protocol diagnostic message that

92 OS/400 TCP/IP Configuration and Reference V5R1

NoticesThis information was developed for products and services offered in the U.S.A.IBM may not offer the products, services, or features discussed i

programs and other programs (including this one) and (ii) the mutual use of theinformation which has been exchanged, should contact:IBM CorporationSof

AS/400eATC/400CICS/400Client AccessCTDB2Distributed Relational Database ArchitectureDRDAe (Stylized)IBMIBM Global NetworkIntegrated Language Environme

How to send your commentsYour feedback is important in helping to provide the most accurate andhigh-quality information. If you have any comments abou

96 OS/400 TCP/IP Configuration and Reference V5R1

IndexSpecial Characters*AIX format 51*AS400 format 51*BASE pool size 71*IOSYSCFG authority 10*NIC format 51*SYSGEN default value 10, 76(Transmission C

dead gateway processing 55default routeadding 15displayTCP/IP connections 48displayingsystem name and address 19distributed data interface (DDI)fiber

NNETSTAT (Network Status)command 33network interfacetypes supported 75Network Status (NETSTAT)command 33network status for TCP/IPconnectionsdisplay 40

TCP/IP (Transmission ControlProtocol/Internet Protocol) (continued)QTSMTPSRVR 25planning for installation andconfiguration 2QSYSWRK subsystem 25starti

Printed in the United States of Americaon recycled paper containing 10%recovered post-consumer fiber.SC41-5420-04

x OS/400 TCP/IP Configuration and Reference V5R1

Summary of changesThis is the fifth edition of TCP/IP Configuration and Reference.Most topics from the fourth edition of TCP/IP Configuration and Refe

xii OS/400 TCP/IP Configuration and Reference V5R1

Chapter 1. Configuring TCP/IPThis chapter explains how to configure an iSeries 400®server for TransmissionControl Protocol/Internet Protocol (TCP/IP).

v Working with TCP/IP host tables, including configuring a TCP/IP host nameand domain namev Verifying a TCP/IP connection (PING)Planning for TCP/IP In

“Step 6—Configuring TCP/IP Host Table Entries” on page 18. For informationabout configuring and using a DNS server, seeDNS(http://publib.boulder.ibm.c

Table 1. Line Description Parameters (continued)Line Type *ELAN *TRLAN *WLS *DDI *FR *X25 *ASYNC *PPP *TDLCNetwork controller RConnection type RLogica

Table 2. Local TCP/IP Host Information (continued)X.25 / Remote System InformationHost #1 Host #2 Host #3Internet addressX.25 network addressPVC chann

v Automatic IPLThe Automatic IPL option determines whether the system automaticallystarts when the installation process has completed successfully.Whe

v Option 5. Start TCP/IP servers: Select this option to issue the Start TCP/IPServer (STRTCPSVR) command. This command is used to start the TCP/IPappl

Following are descriptions of the Configure TCP/IP menu options.v Option 1. Work with TCP/IP interfaces: Select this option to add TCP/IPinterface inf

server) was removed from the menu. Option 12, formerly Change localdomain and host names, was renamed to Change TCP/IP domaininformation.v Option 20.

3. Configuring TCP/IP routes4. Configuring TCP/IP attributes5. Configuring remote system information (X.25)6. Configuring host table entries7. Configu

Subnet maskDefines which part of an Internet address forms the subnet (subnetwork)field of an Internet address. An example of a single-network subnet

When you are finished adding entries, the Work with TCP/IP Interfaces displaylooks like Figure 4.Note: Any change to the TCP/IP interfaces configurati

same network that the server is attached to. You must also add routing entries toallow TCP/IP clients that are attempting to reach your server from a

Preferred binding interfaceThe preferred binding interface allows administrators to choose which ofthe TCP/IP interfaces that they prefer the route to

Note: Any changes that you make to the routing information take effectimmediately.Multiple Default RoutesDefault routes are used to route data that is

iSeriesTCP/IP Configuration and ReferenceVersion 5SC41-5420-04

Step 4—Configuring TCP/IP attributesTo configure the TCP/IP attributes, type option 3 on the Configure TCP/IP menu.The Change TCP/IP Attributes (CHGTC

Type option 1 (Add) at the input-capable top list entry to go to the Add TCP/IPRemote System (ADDTCPRSI) display, as shown in Figure 10.The network co

information. If DDN is specified as *YES on the X.25 connection, you should notspecify remote system information for that interface or its associated

To add an entry to your local host table, type option 10 on the Configure TCP/IPmenu. The Work with TCP/IP Host Table Entries display is shown in Figu

The iSeries TCP/IP host table is shipped with the LOOPBACK entry. TheLOOPBACK entry has an Internet address of 127.0.0.1 and two host names:LOOPBACK a

Additional host names are useful as alternative nicknames. See the examples inFigure 15.Host names need not be unique. When searching the host table w

v Simple Mail Transfer Protocol (SMTP) requires your host name to be in the hosttable or on a domain name server.v You may want to use your host table

(http://publib.boulder.ibm.com/pubs/html/as400/v5r1/ic2924/info/rzaku/rzakuconcat.htm) in the Information Center. If you are using the SupplementalMan

Step 8—Starting TCP/IP and TCP/IP ServersBefore any TCP/IP services are available on the iSeries system, TCP/IP processingmust be initialized and acti

Using the Start TCP/IP Server (STRTCPSVR) command starts the serversindividually or together. You can monitor the jobs with option 20 (Work withTCP/IP

NoteBefore using this information and the product it supports, be sure to read the information in“Notices” on page 93.Fifth Edition (May 2001)This edi

Table 3. Jobs Used by TCP/IP (continued)Job Name DescriptionADMIN and DEFAULT ICS (HTTP) serverQTWSGxxxxx Workstation gateway (there may be several)No

3. If the PING operation is successful, you should see messages similar to those inFigure 18.If the PING operation is unsuccessful, you should see mes

additional systems to your network, you also need to verify their TCP/IPconnection. The examples in the following paragraphs show you how to verify ar

Verifying TCP/IP Connections with Host Name—ExampleIn this example, sending five packets of 256 bytes each verifies the connection tothe remote system

Verifying TCP/IP Connections with Internet Address—ExampleIn this example, (Figure 22) the connection to the remote system at Internet address9.4.191.

Note: You do not have to end TCP/IP in order to save the configuration files.However, you should end TCP/IP before any TCP/IP configuration files arer

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Chapter 2. TCP/IP: Operation, Management, and AdvancedTopicsThis chapter discusses managing your network by using the NETSTAT command,and the maintena

Work with TCP/IP Interface StatusThe Work with TCP/IP Interface Status display, as shown in Figure 25, providesthe most current summary of interface a

Starting TCP/IP InterfacesTCP/IP interfaces are started in one of the following ways:v The Work with TCP/IP Interface Status displays are reached by:–

ContentsAbout TCP/IP Configuration andReference (SC41-5420) ...vPrerequisite and related information . . viiOperationsNavigator...viiHow

depends mainly on machine use and the size of the processor. To determinewhether the interface has started, view the messages in the QTCPIP job logand

v The network ID of the interface must be equal to the logical AND of the nexthop for the route and the subnet mask for the interface.Notes:1. If the

To view detailed information about a specific route, type 5 in the option field nextto the route and press the Enter key.Routes listed on the Display

contain an asterisk (*). When an application requests a connection to a listeningsocket, a new connection is created. The remote Internet address and

Ending TCP/IP ConnectionsTCP/IP connections and User Datagram Protocol (UDP) sockets can be ended fromthe Work with TCP/IP Connection Status display.

To end the TCP/IP connections, press the Enter key from the Confirm End ofTCP/IP Connections display.If you decide not to end a TCP/IP connection or i

Displaying TCP/IP Network Status InformationIn addition to working with network status functions, the Work with TCP/IPNetwork Status menu allows you t

Displaying TCP/IP InterfacesTo display more detailed information about the TCP/IP interface status for specificinterfaces:1. On the Work with TCP/IP I

Displaying Associated RoutesTo display information about the routes associated with a specific interface:1. On the Work with TCP/IP Interface Status d

Press F11 to show the display that includes the type of service (TOS), maximumtransmission unit (MTU), type, and source.Displaying Route Details Optio

IP Multicasting ...68Multicast Application Programming Information 68Multicast Restrictions ...68Chapter 3. TCP/IP Performance ...71

Displaying TCP/IP Route InformationTo display TCP/IP route information:1. On the Work with TCP/IP Network Status menu, type 2 on the command lineor en

To view the second Display TCP/IP Route Information display, press F11 (Displayroute type). The route information is presented in Figure 40. To return

Displaying TCP/IP ConnectionsYou can request more detailed information about TCP/IP connections shown onthe Work with TCP/IP Connection Status display

Displaying Connection TotalsTo display a summary of TCP and UDP counts, press F10 on the Work withTCP/IP Connection Status display. The counts provide

(SNMP). For additional information about SNMP, see resources in the InformationCenter: Supplemental Manuals.TCP/IP Host TablesHost tables are a method

Managing TCP/IP Host TablesIn a large network, it can be more efficient to administer iSeries TCP/IP from acentral site. Working with the host table w

A complete description of the *NIC format is found in Request for Comment (RFC)952, Internet Host Table Specification. See the RFC Editor Site (http:/

v Merge the information of the imported host table with the information that wasentered by using option 10 (Work with TCP/IP host table entries) from

Step 4—Merge the FileType the following FTP subcommand:quote rcmd mrgtcpht fromfile(qusrsys/m03host) frommbr(host)IP Routing and Internet Control Mess

To see routing changes due to ICMP redirect messages, select NETSTAT menu 2 orNETSTAT *RTE and then press PF11. Comparing the next hop in this display

About TCP/IP Configuration and Reference (SC41-5420)This book contains information about configuring Transmission ControlProtocol/Internet Protocol (T

The data link layer passes a negative advice indicator to IP when it is unable totransmit data to a first-hop (directly-connected) gateway. In most ca

Note: The maximum number of interfaces that can be active on a line descriptionat any given time is 128. This is true for all line types (for example,

addresses, your server appears as multiple TCP/IP hosts in the same TCP/IPnetwork (Figure 49).This scenario can be helpful for backup or to improve pe

an Internet address of different TCP/IP networks. With these multiple Internetaddresses, you take part in different TCP/IP networks (Figure 51).This e

Type of Service (TOS)Type of Service (TOS) is a parameter defined to indicate a quality of the servicedesired by an application program. It is specifi

The following table shows which type of services your server uses for some of theTCP/IP applications:Table 6. AS/400 TCP/IP applications and Type of S

a specific route defined. The system allows up to eight default routes, but eachroute must have a unique next hop value.An example of a multiple route

the specified port. If no match is found, the requesting program is not allowed touse the specified port. If any port in the 1-1023 range is restricte

Let us assume we have an application that uses Port 1060 in the TCP layer and wewant to restrict its use to user profile GERRY. Type the information a

Related Tables and the Host TableSocket applications require a set of tables from which they can retrieve specificTCP/IP network data when needed. The

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The services table stores the mapping of services to ports or ports to services asshown in Figure 59. The mapping information is usually accessed with

The network table contains the networks and the Internet address associated withthe network. Socket applications use the getnetbyname() and getnetbyad

The TCP/IP interface now points to a specific PVC instead of a pool of SVCs.ADDTCPIFC INTNETADR('9.4.73.65') LIND(X25LINE)SUBNETMASK('2

supported on multi-access nonbroadcast networks. IP multicast is also notcurrently supported on Frame Relay, FDDI/SDDI, or ATM networks. To determinew

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Chapter 3. TCP/IP PerformanceThe following are performance items that should be considered when usingTCP/IP.*BASE Pool SizeThe TCP/IP protocol and app

v Checksum calculation of outgoing TCP and UPD datagrams (prior to V4R4)v Checksum verification of incoming TCP and UPD datagrams (prior to V4R4)v Out

Note: If you configure your 100 Mbps ethernet line for TCPONLY, all IOP assistfunctions are disabled.TCP/IP-assist functions that are available on fra

If you have one of these configurations, you can use the TCPONLY parameterwhen you create or change your Ethernet line descriptions. Setting TCPONLY t

Appendix A. Configuring a Physical Line for TCP/IPCommunicationOn the iSeries 400, communication occurs through objects called lines, controllers,and

Prerequisite and related informationUse the iSeries Information Center as your starting point for looking up iSeries andAS/400e technical information.

You can describe the characteristics of the communications devices using the byCreate Device Description (Network) (CRTDEVNET) command or by letting t

If the Ethernet standard prompt is *ETHV2, the system sends and receives allTCP/IP data in Ethernet Version 2 frames. You do not need to configure any

78 OS/400 TCP/IP Configuration and Reference V5R1

Appendix B. TCP/IP Application Exit Points and ProgramsCertain TCP/IP applications provide exit points that enable them to callcustomer-written exit p

OS/400 Registration FacilityExit points for TCP/IP applications are automatically registered when the parentproduct or option is installed, using the

Table 9. TCP/IP Application Exit Points (continued)TCP/IP Application Exit Point Exit Point FormatNote:1The same interface format is used for request

Step 1. Select your exit pointType 8 next to the exit point to which you want to add an exit program. Forexample, to associate a program with the WSG

Step 2: Select the Add Exit Program optionSelect the add option by typing a 1 (Add) in the Opt column as shown inFigure 66.Step 3: Add your exit progr

When you add workstation gateway server exit programs, you do not need toend and restart the workstation gateway server. The WSG server checks for the

Exit Point Interfaces for TCP/IP Application Exit PointsThe exit point interfaces for TCP/IP application exit points are:v TCP/IP application request