Addtron Technology Electronic Device WebNet - Manual (Page 39)

B WebNet IP configuration
Before you can configure your WebNet properly it must be assigned a valid IP address.
This is done automatically if a DHCP, BOOTP, or RARP, server is present in your network
- or manually with the ARP command using the WebNet AutoIP feature. Most products
will only have AutoIP enabled by default, other features must be enabled by configuration.
An IP address is a unique address for a host in a TCP/IP network. For manual configuration
(including AutoIP) it is therefore important for you to have a valid IP address at hand,
not used by anyone else on the network.
When WebNet is powered on it will immediately try to obtain an IP address from a DHCP,
BOOTP, or RARP server - if any of these services are enabled. Automatically assigned
network parameters can be verified on the WebNet network settings page.
B.1 Secure Restart
Most WebNet products have a button, or a jumper, which can be used to perform a secure
restart - which enables factory default settings during reboot. Factory default settings
have the AutoIP feature enabled, and you can then get access to a WebNet with unknown
network settings.
Secure restart is performed by:
1. pressing the control button (or jumper) about ten seconds, until the WebNet LEDs
switches off. The LEDs may still flicker, but this just indicates normal activity.
2. then release the button. The LEDs will flicking heavily, indicating that a secure restart
is in progress. A new button click during this period cancels the secure restart.
3. After about five seconds of uninterrupted LED flickering the WebNet reboots and
enters secure mode using its factory default settings.
The default settings will be active until the next reboot. During this period you can use
the AutoIP feature to assign a temporary IP address to WebNet. This IP address should
be used to gain access and reconfigure WebNet properly.
B.2 Your ARP table
When your computer uses TCP/IP, e.g. has a Web Browser, it also has an ARP table for
your ethernet. The ARP table translates other units IP addresses to their respective MAC
addresses - which is required to communicate with other unit on an ethernet network. ARP
is a caching mechanism which normally does its job silently in the systems background.
It requires that other units on the network are configured with IP addresses. The ARP
tables can be monitered and manually updated using the ’arp’ command available from a
command prompt.
WebNet User’s Guide 39