RPC Manager uses name resolution to discover the IP for a particular workstation name. Name resolution looks in the following places (and in the order listed) to derive an IP address:
1. The operating system HOSTS file is searched (see HOSTS File);
2. If not found, any configured domain name servers (DNS) are checked; and
3. If still not found, NetBIOS broadcasting is used.
Most SCADA systems will function well with static IP to name mapping, such as is provided by a HOSTS file (see HOSTS File). There is really only a need to configure DNS if you wish to centralize the name resolution services, or use dynamic IP assignment; however, if the assignment of an IP address changes, VTS will need to be restarted as the RPC Manager currently will not track dynamic IP re-mapping.
Caution: A correctly configured name resolution system is essential for correct operation of the distributed system.
A full discussion of name resolution techniques and rules are outside the scope of this document. Consult your operating system documentation for full details about name resolution.