/etc/services and ETC.SERVICES port assignments
The z/OS® UNIX file, /etc/services, contains the service names and port assignments of specific z/OS UNIX applications. The MVS™ data set ETC.SERVICES can also be used to contain the same information. The source for this example is shipped in SEZAINST(SERVICES) and copied to the hlq.ETC.SERVICES by the Installation Verification Procedure (IVP). The source is also installed in /usr/lpp/tcpip/samples/services for use in copying it to /etc/services. It is important that /etc/services and hlq.ETC.SERVICES be kept identical so that MVS and z/OS UNIX applications use the same port assignments. The shipped file contains the most current assignments.
Rules: The following syntax rules apply to the
services information specification:
- An ETC.SERVICES data set must be fixed or fixed block with an LRECL between 56 and 256.
- The /etc/services z/OS UNIX file can have a maximum line length of 256.
- Each service is listed on a single line corresponding to the form:
ServiceName PortNumber/ProtocolName Aliases- ServiceName
- Specifies an official Internet service name.
- PortNumber
- Specifies the socket port number used for the service.
- ProtocolName
- Specifies the transport protocol used for the service.
- Aliases
- Specifies a list of unofficial service names.
Items on a line are separated by spaces or tabs.
- A service name must start in the first position on a line.
- The maximum service name and alias name length is 32 characters.
- A maximum of 35 aliases is recognized.
- Service and alias names are case sensitive.
- Comments begin with a # or ; character and continue until the end of the line.
When services information is requested, the definitions are searched sequentially. The first entry matching a specified search request (either service name and protocol or port number and protocol) is returned.
For the search order used in locating /etc/services and ETC.SERVICES, see z/OS Communications Server: IP Configuration Guide.
Tip: The following example was used for test configuration and is for illustration only.
# z/OS Communications Server
# SMP/E distribution path: /usr/lpp/tcpip/samples/IBM/EZAOESER
# SMP/E distribution path: SEZAINST(EZAEB02J)
#
# Licensed Materials - Property of IBM
# 5650-ZOS Copyright IBM Corp. 1998, 2015
# Status = CSV2R2
#
# $Header:services 9.4$
# $ACIS:services 9.4$
# $Source: /ibm/acis/usr/src/etc/RCS/services,v $
# Change Activity:
#
# Flag Reason Release Date Origin Description
# ---- -------- -------- ------ -------- -----------------------
# $X1= D136984 R8BASEN 060303 ADAMSON : JES NJE over TCP/IP
# $Y1= D139394 R9BASEN 061011 AMITRANO: NFS port information
# $F1= D146073 RBBASE 081016 PACKETTA: Add port 521 alias
# $31= RFSLEDLC CSV2R2 140731 adamson : Remove ncprout (23281)
# -------------------------------------------------------------------
# @(#)services 1.16 (Berkeley) 86/04/20
#
# Network services, Internet style
#
# Service port/protocol alias names if any @Y1A
#
echo 7/tcp
echo 7/udp
discard 9/tcp sink null
discard 9/udp sink null
systat 11/tcp users
daytime 13/tcp
daytime 13/udp
netstat 15/tcp
qotd 17/tcp quote
chargen 19/tcp ttytst source
chargen 19/udp ttytst source
ftp 21/tcp
telnet 23/tcp
smtp 25/tcp mail
time 37/tcp timserver
time 37/udp timserver
rlp 39/udp resource # resource location
nameserver 42/tcp name # IEN 116
whois 43/tcp nicname
domain 53/tcp nameserver # name-domain server
domain 53/udp nameserver
mtp 57/tcp # deprecated
tftp 69/udp
rje 77/tcp netrjs
finger 79/tcp
link 87/tcp ttylink
supdup 95/tcp
hostnames 101/tcp hostname # usually from sri-nic
#csnet-cs 105/?
pop 109/tcp postoffice
sunrpc 111/tcp
sunrpc 111/udp
auth 113/tcp authentication
sftp 115/tcp
uucp-path 117/tcp
nntp 119/tcp readnews untp # USENET News Xfer Proto
ntp 123/udp # Network Time Protocol
snmp 161/udp # snmp request port
snmp-trap 162/udp # snmp monitor trap port
vmnet 175/tcp # JES NJE over TCP/IP @X1A
#
# UNIX specific services
#
exec 512/tcp
biff 512/udp comsat
login 513/tcp
who 513/udp whod
shell 514/tcp cmd # no passwords used
syslog 514/udp
printer 515/tcp spooler # line printer spooler
talk 517/udp
ntalk 518/udp
efs 520/tcp # for LucasFilm
#
# IBM added services
#
route 520/udp router omproute
route 521/udp ipv6rip ripng # @F1C
timed 525/udp timeserver
tempo 526/tcp newdate
courier 530/tcp rpc
conference 531/tcp chat
#
# RVD service
#
rvd-control 531/udp # rvd control port
netnews 532/tcp readnews
netwall 533/udp # -for emergency broadcasts
uucp 540/tcp uucpd # uucp daemon
#
# Kerberos services
#
klogin 543/tcp # Kerberos authenticated rlogin
kshell 544/tcp cmd # Kerberos remote shell
remotefs 556/tcp rfs_server rfs # Brunhoff remote filesystem
#
# IBM added service
#
# Andrew File System Authenticated services
#
vexec 712/tcp vice-exec
vlogin 713/tcp vice-login
vshell 714/tcp vice-shell
#
# Kerberos services
#
kerberos 750/udp kdc # Kerberos authentication--udp
kerberos 750/tcp kdc # Kerberos authentication--tcp
kerboros_master 751/udp # Kerberos authentication
kerberos_master 751/tcp # Kerberos authentication
passwd_server 752/udp # Kerberos passwd server
userreg_server 753/tcp # Kerberos userreg server
krb_prop 754/tcp # Kerberos slave propagation
erlogin 888/tcp # Login and environment passing
#
#
# Kerberos sample server
#
sample 906/tcp # Kerberos sample app server
sample 906/udp # for kerberos simple test
kpop 1109/tcp # Pop with Kerberos
ingreslock 1524/tcp
#
# Policy Agent QoS Listener and Collector ports
#
pagentQosListener 1700/tcp # Policy Agent Listener thread
pagentQosCollector 1701/tcp # Policy Agent Collector thread
#
# Andrew File System services
#
filesrv 2001/tcp
rauth2 2001/udp
rfilebulk 2002/udp
rfilesrv 2003/udp
console 2018/udp
# For file server backup and migration
client 2030/tcp
# NFS server @Y1A
# @Y1A
# Port 2049 must be used for nfsd. @Y1A
# @Y1A
# Consecutive port numbers must be assigned for the NFS status, @Y1A
# nlockmgr, mountd, mvsmount, showattr, and pcnfsd services. @Y1A
# The example below uses ports 2043-2048. @Y1A
# When the NFS callback function is being used the services @Y1A
# nfsscb_b and nfsscb_e should reserve 100 consecutive ports. @Y1A
# The example below uses port 10300 for the beginning port @Y1A
# and port 10399 as the ending port. @Y1A
# For additional information see the Network File System Guide @Y1A
# and Reference manual. @Y1A
# @Y1A
status 2043/tcp nfs_statd # NFS State daemon (NSM) @Y1A
status 2043/udp nfs_statd # NFS State daemon (NSM) @Y1A
nlockmgr 2044/tcp nfs_lockd # NFS Lock daemon (NLM) @Y1A
nlockmgr 2044/udp nfs_lockd # NFS Lock daemon (NLM) @Y1A
mountd 2045/tcp mount # NFS mount daemon @Y1A
mountd 2045/udp mount # NFS mount daemon @Y1A
mvsmount 2046/tcp nfs_mvsmnt # NFS mvsmount daemon @Y1A
mvsmount 2046/udp nfs_mvsmnt # NFS mvsmount daemon @Y1A
showattr 2047/tcp nfs_showattr # NFS showattr daemon @Y1A
showattr 2047/udp nfs_showattr # NFS showattr daemon @Y1A
pcnfsd 2048/udp nfs_pcnfs # NFS pcnfsd daemon @Y1A
nfsd 2049/tcp nfs # NFS server daemon @Y1A
# - do not change @Y1A
nfsd 2049/udp nfs # NFS server daemon @Y1A
# - do not change @Y1A
# @Y1A
# NFS Callback function port range @Y1A
# @Y1A
nfsscb_b 10300/tcp # NFSS callback port begin @Y1A
nfsscb_e 10399/tcp # NFSS callback port end @Y1A
nfsscb_b 10300/udp # NFSS callback port begin @Y1A
nfsscb_e 10399/udp # NFSS callback port end @Y1A
#
# Kerberos services
#
knetd 2053/tcp # Kerberos de-multiplexor
eklogin 2105/tcp # Kerberos encrypted rlogin
#
# Andrew File System services
#
venus.itc 2106/tcp
ropcons 2115/udp
# The following are assigned in pairs and the bulk must be the srv +1
rupdsrv 2131/udp
rupdbulk 2132/udp
rupdsrv1 2133/udp
rupdbulk1 2134/udp
njenet-ssl 2252/tcp # JES NJE over TCP/IP with SSL @X1A
Figure 1. /etc/services example