The following example configuration file shows how to set up a configuration that provides access to a number of OpenVMS systems accessible via DECnet but not themselves running PMDF. Although these remote machines are not running PMDF they can, nevertheless, participate fully in the network. The only disadvantage to not running PMDF on all the remote systems is that the remote systems cannot send mail to the gateway unless the gateway system is up. The converse is not true; messages will be queued on the gateway until they can be delivered to the remote systems.
The domain name of the gateway system is YMIR.ACME.COM. Its DECnet name is YMIR. The names of the remote systems are CLARMATH.ACME.COM (DECnet name CMATH), CMCVAX.ACME.COM (CMCVAX), ECHMC.ACME.COM (ECHMC), MEDCHEM.ACME.COM (MEDCHM). MEDCHEM.ACME.COM is also known under the alias MEDCHM.ACME.COM. Shortform aliases equivalent to the DECnet node names are also provided. Note that the DECnet node names are not necessarily the same as the first part of the domain names.
Simple rewrite rules are used to map the names of the systems and any aliases or shortform names into the proper canonical domain names. This insures that the proper domain-style addresses appear in all message headers.
Channel table rewriting is then used to map the domain names back onto the proper DECnet node names. Channel rewriting is only applied to envelope To: addresses and hence only affects the addresses that need to be converted to DECnet node name format; all other addresses are left unchanged.
Without further ado, then, the requisite configuration is exhibited in Example 2-5 below.
Example 2-5 Configuring a gateway for a DECnetnetwork
YMIR.ACME.COM $U@YMIR.ACME.COM YMIR $U@YMIR.ACME.COM ! CLARMATH.ACME.COM $U@CLARMATH.ACME.COM CLARMATH $U@CLARMATH.ACME.COM CMATH $U@CLARMATH.ACME.COM CMCVAX.ACME.COM $U%CMCVAX.ACME.COM@DECNET-MAIL CMCVAX $U%CMCVAX.ACME.COM@DECNET-MAIL ECHMC.ACME.COM $U%ECHMC.ACME.COM@DECNET-MAIL ECHMC $U%ECHMC.ACME.COM@DECNET-MAIL MEDCHM.ACME.COM $U@MEDCHEM.ACME.COM MEDCHM $U@MEDCHEM.ACME.COM MEDCHEM.ACME.COM $U@MEDCHEM.ACME.COM MEDCHEM $U@MEDCHEM.ACME.COM l YMIR.ACME.COM d 733 DECNET-MAIL CLARMATH.ACME.COM CMATH MEDCHEM.ACME.COM MEDCHM