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G&R

Accepting connections

Products and applications receiving connections must configure a local node

name using the -ln option, causing the line handler to accept incoming calls.

The local mailbox name should then also be specified using the -mn option.

Because a line handler can deal with only one incoming connection, a system

accepting multiple simultaneous connections to a single node name must use a

listener, described below. The -ln option then registers the application with

the listener for the given node name as listening on the given mailbox. It is then

the listener for the given node name which accepts connections and forwards

them to the applications which have registered that they are listening to

mailboxes on that node name.

The listener

The nl_dsa program listens for incoming connections on a given SC (Session

Control name, also referred to as DSA node name), and dispatches incoming

connections to waiting programs. This allows you to have many programs

listening for incoming connections on the same SC, but for different mailboxes.

We recommend you always use the DSA protocol (default) to avoid

unnecessary overhead and many known errors in the DIWS handlers on the

mainframes and front-ends, but you can use the DIWS protocol if you must.

Please note that a listener can listen for either DSA or DIWS connections, but

not both protocols at the same time. If you need to accept both DSA and DIWS

connections, then you need to start up 2 instances of the nl_dsa program: one

with the -prot DIWS parameter, and one with default (–prot DSA). Also

note that if RFC1006 protocol is used, 2 listeners cannot use the same RFC1006

port number; you must start one of the listeners using a non-standard port

number (i.e. different from 102) using the –lp parameter.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Installationshandbuch Seite 27