TCP/IP Level 520 Preventive Service Planning
(PSP) Bucket
**> Last update: 30 Apr 2009
**> Synch'd w/RETAIN: 04 May 2009
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* SUBSET VM520 *
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This SUBSET contains installation information for TCP/IP Level 520 for
z/VM Version 5 Release 2.0.
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* C H A N G E S U M M A R Y *
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Date Last
Changed Section
1. 2006/11/10 Installation Information
2. 2005/12/16 Documentation Changes
3. 2005/12/16 General Information
4. 2009/04/30 Service Recommendations See 0901RSU
5. yyyy/mm/dd Cross Product Dependencies No Entries
Service Recommendation Summary
DATE APAR PTF VOLID COMMENTS
1. yyyy/mm/dd xxnnnnn xxnnnnn nnnn N/A
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* SECTION 1. I N S T A L L A T I O N I N F O R M A T I O N *
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This section contains changes relevant to the installation of the
product, or to its Program Directory.
7. 2006/11/10 Customers who migrate to z/VM 5.2.0 from a previous level
should note that the GATEWAY statement format has changed
with level 520. GATEWAY statements defined using the
previous format (and, which are syntactically correct) are
accepted and used by the 520 level of the TCPIP server
module. However, the presence of such statements will
cause messages DTCPRS007E and DTCPRS058I to be produced
whenever those statements are processed by TCP/IP.
7. 2006/03/28 Certain components of the IPFORMAT command have been
supplied with the z/VM 5.2.0 product deliverable at
an incorrect code level. APAR PK22191 (currently
open) will supply updates to correct this problem.
6. 2005/12/16 When network devices are configured for the TCP/IP
(stack) server virtual machine, ensure that any virtual
device addresses specified for a device are available
for use. (Such virtual addresses are specified as part
of DEVICE statements within the TCP/IP server
configuration file -- PROFILE TCPIP, or its
equivalent.)
For example, for a default installation environment,
virtual addresses 401, 402 and 405 cannot be used for
network devices unless local adjustments are made.
These addresses have been reserved and defined within
the z/VM system directory for establishing links to
MAINT-owned National Language Support (NLS) HELP
minidisks, to allow specific help information to be
referenced in the appropriate environments.
5. 2005/12/16 It my be possible to address certain z/VM host
connectivity problems by including specific
ASSORTEDPARMS operands in the TCP/IP server
configuration file (PROFILE TCPIP, or its equivalent).
The OVERRIDEPRECEDENCE operand may help alleviate
general connectivity problems that arise when clients
alter TCP/IP Type-of-Service (TOS) values after a
connection has been established. Connections that
appear to close unexpectedly are symptomatic of a
possible need for using the OVERRIDEPRECEDENCE operand.
The NORFC1323 operand may help alleviate TN3270
connectivity problems that arise with Telnet
connections that are associated with Windows 95 (Win95)
hosts. Win95-initiated Telnet connections that appear
to "hang" on a regular basis, and with consistent
duration, are symptomatic of a possible need for using
the NORFC1323 operand.
Note: The use of the NORFC1323 operand may impact TCP
connection performance for other TCP clients, as
this operand prevents the z/VM TCP/IP server from
initiating RFC 1323-related performance features
(although client requests to enable these
facilities are always accepted).
4. 2005/12/16 For customers who plan to use the Secure Socket Layer
(SSL) server support, please note the following:
To use the Secure Socket Layer (SSL) server, a suitably
configured Linux kernel and file system must be
installed on your z/VM system. Detailed information
about Linux requirements and preparation for use by the
SSL server are available at the TCP/IP for z/VM home
page on the World Wide Web. The URL for this home
page is:
http://www.vm.ibm.com/related/tcpip/
Note: If no specific action is taken to configure the
SSL server and an attempt is made to initialize
this server, the SSL server will report errors
similar to those shown here and will fail to
initialize:
DTCRUN1011I Server started at nn:nn:nn
on dd mmm yyyy (day)
DTCRUN1011I Running "VMSSL"
DTCSSL2428I Port 9999 is used for SSL administration.
HCPVMI232E IPL UNIT ERROR; IRB 00404017 00000010
00200018 00800000
HCPGIR450W CP entered; disabled wait PSW 000E0000
00000232
3. 2005/12/16 Customers who plan to use an External Security Manager
(ESM) different from the IBM Resource Access Control
Facility (RACF), such as VMSECURE from Sterling Software
Inc., should review Informational APAR II11256 for
additional information about configuring TCP/IP servers
in such an environment.
2. 2005/12/16 Missing interrupt conditions for I/O operations involving
devices dedicated to the TCPIP virtual machine should be
detected, but *not* dealt with. For z/VM, the default
MIH setting of OFF will accomplish this. (This default
is in effect when MIH is not specified on the user
directory OPTION statement or the SET MIH command is not
issued within a virtual machine).
However, when MIH OFF is in effect, CP issues HCPMHT2150I
messages to the operator, to indicate that an I/O
operation was started but the MIH interval expired before
the device sent an interrupt. In some instances, these
messages may flood the OPERATOR console.
Use of the 'OFF' parameter of a related command, CP SET
MITIME, can prevent excessive HCPMHT2150I messages
related to TCPIP from appearing on the OPERATOR console.
This command controls the time interval at which a
specified device is checked for missing interrupts.
To reduce occurrences of HCPMHT2150I messages, use the
following command. Note that only the device(s)
dedicated to the TCPIP server should be specified with
this command.
CP SET MITIME rdev1-rdev2 OFF
The CP SET MITIME command should be issued within
an "exit" exec, identified by an ":Exit." tag that is
defined for the TCPIP server entry in a locally created
DTCPARMS file.
1. 2005/12/16 Prior to installing TCP/IP for z/VM, you may find it
useful to review the content of the following ITSO
Redbooks if you're not familiar with TCP/IP protocols,
functions and networking principles:
* "TCP/IP Tutorial and Technical Overview",
(GG24-3376)
* "IP Network Design Guide", (SG24-2580)
* "TCP/IP Solutions for VM/ESA", (SG24-5459)
* "IBM Communications Server for OS/390 V2R10 TCP/IP
Implementation Guide, Volume 1: Configuration and
Routing", (SG24-5227)
Additional textbook references that may be useful are:
* "TCP/IP Illustrated, Volume 1: The Protocols," Richard
W. Stevens, Addison-Wesley, Reading, Massachusetts,
1994. ISBN: 0-201-63346-9 (SR28-5586-00)
* "Internetworking with TCP/IP Volume I:Principles,
Protocols, and Architecture," Douglas E. Comer, Prentice
Hall, Englewood Cliffs, New Jersey, 1991.
ISBN: 0-13-216987-8 (SC31-6144-00)
* "DNS and BIND in a Nutshell," Paul Albitz & Cricket
Liu, O'Reilly & Associates, Sebastopol, California,
1992. ISBN: 1-56592-010-4 (SR28-4970-00)
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* SECTION 2. D O C U M E N T A T I O N C H A N G E S *
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This section provides corrections for significant errors in TCP/IP
Level 520 documentation.
1. 2005/12/16 A typographical error exists in the following informal
publication:
"Program Directory for TCP/IP for z/VM - Level 520"
(GI11-2853-00)
In section 5.2.4.11, "NETSTAT Command", the first
subheading that follows (5.2.4.11.1, "Changes
Introduced in TCP/IP Level 510") should instead cite
"Changes Introduced in TCP/IP Level 520".
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* SECTION 3. G E N E R A L I N F O R M A T I O N *
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This section contains general information, i.e., hints/tips.
6. 2005/12/16 Prior to z/VM 5.1.0, the PING and TRACERTE commands have
been implemented as Pascal-based programs, and have
provided only IPv4 support. As of z/VM 5.1.0, the PING
and TRACERTE commands were enhanced to include IPv6
support, which has required the use of current C
programming socket libraries. Because of this
requirement, the Pascal-based PING and TRACERTE commands
have been replaced with C-based implementations.
However, in addition to gaining IPv6 capability through
use of the C language, the PING and TRACERTE also inherit
a known peculiarity of running C programs on z/VM - the
inability to use the CMS 'HX' (Halt execution) "immediate"
command to terminate a running C-based program.
Whether this situation is viewed as being a limitation or
a restriction, the use of an HX command to terminate a C
program is not reliable and may potentially result in an
abend into a CP READ state, which then requires a re-IPL
of CMS.
To reduce the potential for users of the PING and TRACERTE
commands to experience this behavior, these commands
implement logic that intercepts an 'HX' command and
acquires all input provided at the subsequent 'VM READ'
(treating such input as if a 'CP BEGIN' command had been
entered).
Thus, all data provided at a 'VM READ' under such
circumstance is ignored, and one is returned to a CMS
'Ready' prompt as quickly as possible.
While this behavior deviates from that seen when the HX
command is used in a more conventional setting, this was
deemed necessary, since the PING and TRACERTE commands are
frequently used TCP/IP diagnostic aides.
5. 2005/12/16 As of z/VM 5.1.0, host/domain name resolution is
performed for various TCP/IP functions through the use of
IBM Language Environment (LE) sockets. To ensure that
adequate virtual storage is available to allow for such
resolution, virtual machines that use TCP/IP functions
should be defined with a minimum of 16M of virtual
storage.
4. 2005/12/16 Several TCP/IP for z/VM functions are Pascal-based, and
use VMCF communications to communicate with the TCPIP
server. Therefore, these functions cannot be reliably
used in conjunction with other applications that also use
VMCF communications (such as the CMS Utility, WAKEUP);
doing so may produce intermittent hangs during processing
or other unpredictable results.
The TCP/IP Pascal-base functions for which such problems
may arise are:
FTP HOMETEST LPQ LPR LPRM NETSTAT
OBEYFILE PING REXEC TELNET TESTSITE TFTP
See CMS Utilities APAR VM58540 for more information about
problems when using FTP in conjunction with WAKEUP.
See TCP/IP for z/VM APAR PQ87840 for more information
about problems when using REXEC in conjunction with
WAKEUP.
3. 2005/12/16 With RSCS Version 3 Release 1 (V3 R1), enhanced
configuration features, such as embedded files, new
configuration statements (such as LINKDEFINE), and the
ability to use additional comment delimiters ('/*' and
'*/') are available for configuring RSCS. For example:
IMBED fn ft /* RSCS V3 R1 style comments */
The TCP/IP for z/VM program, SMTPRSCS, uses the RSCS
CONFIG file to build an RSCS host table file (SMTPRSCS
HOSTINFO). SMTPRSCS can process RSCS V3 R1 embedded
files, its new configuration definitions, and the
additional comment delimiters.
However, if "generic routing" is used in your environment
(as from using a "ROUTE *" statement), you still need to
identify -- with respect to SMTPRSCS -- any additional
RSCS host names that are relevant to your RSCS network,
which are not in the RSCS CONFIG configuration file.
To do this, you can create a separate file to be used as
input for the SMTPRSCS program. For example, a file
named TCP-RSCS CONFIG, that contains:
IMBED RSCS CONFIG
ROUTE nodeid1
ROUTE nodeid2
:
where each ROUTE statement must have two tokens --
"ROUTE" and a nodeid name of an additional RSCS node to
be identified for use by the SMTP server.
2. 2005/12/16 APAR VM63863, through its associated PTF, UM97520, is
used as the ordering mechanism for the current level of
the TCP/IP Function Level 520 RSU. This APAR/PTF will
be updated during every RSU cycle to indicate the RSU
level that is currently available through ISMD service.
The RSU can be ordered upon request by contacting the
Level 2 support group, or through the SRD (Service
Request & Delivery) function of IBMLink. Please see
the text of APAR VM63863 for more information, if
necessary.
Note: TCP/IP RSU maintenance is provided only as part
of the z/VM 5.2.0 "stacked" RSU.
1. 2005/12/16 When appropriate, the support center will open
informational APARs covering various aspects of TCP/IP
for z/VM. These APARs will cover installation and
maintenance specific information, information on using the
product, and other information that will often assist the
customer. Customers can search for these APARs by using
The product component ID (5735FAL00) and the keyword
TCPIPINFO. It's recommended that customers using TCP/IP
for z/VM review these APARs for information specific to
their needs.
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* SECTION 4. S E R V I C E R E C O M M E N D A T I O N S *
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1. 2009/04/30 Refer to 0901RSU for service recommendations.
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* SECTION 5. C R O S S P R O D U C T D E P E N D E N C I E S *
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This section contains information that is dependent upon another
product other than this subset ID. It also contains information
dealing with migration and product coexistence.
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1. yyyy/mm/dd Interdependent Product:
Problem:
Users Affected:
Recommendation: Install xxxxxxx on Volid xxxx
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* I N F O R M A T I O N A L / D O C U M E N T A T I O N *
* APARs Follow (If Any) *
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