Agilent Technologies E2050-90003 How Configuration Values are Used, Setting Configuration Values

Configuration

Setting Configuration Values

How Configuration Values are Used

During the Power-on

Initialization

Sequence

After Telnet

Configuration

The E2050 LAN/GPIB Gateway uses the default configuration values and/or the configuration values that you changed or set depending on certain situations, such as when the power is cycled on the Gateway or when the Config Preset button on the back panel of the Gateway is pressed.

This section summarizes how configuration values are used in various situations. This information can help you better maintain the Gateway and more easily troubleshoot problems you may encounter with the Gateway.

This section also describes how the Gateway uses the configuration values during the Gateway’s power-on initialization sequence (after power is cycled on the Gateway) and when the Gateway’s Config Preset button is pressed.

When power is applied to the Gateway and the hardware self-test has completed, the networking subsystem is initialized. What happens during this initialization sequence depends on what configuration method, if any, has been used to configure the Gateway.

If you have used the Telnet configuration method to set the IP address, the Gateway will not send BOOTP requests at power-on to configure itself. Instead, the Gateway will simply use the IP address and any other configuration values that were set through Telnet.

Prior to Successful Configuration with BOOTP or BOOTP with TFTP

After BOOTP or BOOTP with TFTP Configuration

If you are applying power to the Gateway before it has been successfully configured with an actual IP address via BOOTP or BOOTP with TFTP, the Gateway will send BOOTP requests to the BOOTP server for up to five minutes. When the BOOTP server’s bootpd daemon receives the request, it will search the /etc/bootptab configuration file for an entry that matches the Gateway’s LAN hardware address.

When a match is found, bootpd retrieves the configuration data associated with the entry and sends it to the Gateway as a BOOTP response. The Gateway then completes its initialization using the configuration data provided in the BOOTP response.

If you have applied power to the Gateway one or more times since configuration, the Gateway will have successfully completed BOOTP requests in the past. Thus, the Gateway will send BOOTP requests for only one minute before it stops and then uses the previous BOOTP response stored in the Gateway’s non-volatile memory.

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