This user exit is used to disable the domain name server (DNS) host name lookup for clients that connect to a Comm. Bridge. Host name lookup is normally performed when adding a client's host name to the Client Name list on the Comm. Bridge main window. In general, it is usually easier to deal with a client's host name than it is its IP address. By default, the Comm. Bridge will attempt to display its client connections using their host names.
The host name lookup is accomplished by calling the system routine getnameinfo(). In certain network environments, the time required to obtain a host name from an IP address can be excessive, especially when the domain name server is behind a firewall. The time to resolve the host name from its IP address is overhead expended when a client connects to the Comm. Bridge. The client can see this overhead as its server application taking longer than expect to return its response.
This exit gives a mechanism whereby the getnameinfo() call can return either a text host name or an IP address. If the IP address of the client is returned then the IP address is displayed in the Client Name list.
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