Hosts and Services in the TCP/IP Network

Communication between R/3 hosts is based on the TCP/IP transport protocol and the SAP gateway (CPI-C Handler).

All hosts and SAP services in the network should be known to each other. For this you have to maintain the hosts and services files.

If you want to use OS/2 hosts in a TCP/IP environment, you need a TCP/IP component. SAP currently supports the following product: IBM TCP/IP Version 2

Defining Hosts

Host names are entered in the hosts file.
The entries in the next example have the following format:

<Internet address> <host name> <host name.sap-ag.de> # user

155.56.66.19 hw1115 hw1115.wdf.sap-ag.de # Müller
155.56.66.20 hw1194 hw1194.wdf.sap-ag.de # Meier
155.56.66.21 hw1213 hw1213.wdf.sap-ag.de # Schmitt
155.56.66.22 hw1247 hw1247.wdf.sap-ag.de # Huber

Testing Connections

You can test a connection between hosts with the following command:

ping <hostname>

Defining Services

R/3 services are entered in the services file.

This file contains the official service names with the corresponding port numbers and protocols, which the services use. Optional alias names can also be defined in it.

The entries have the following format:

<Service name> <port number/protocol> <optional alias name>

sapdp00 3200/tcp
sapdp01 3201/tcp
sapdp02 3202/tcp
sapgw00 3300/tcp
sapgw01 3301/tcp
sapgw02 3302/tcp