FAQs about the USB-Server
Commissioning, configuration, troubleshooting
- How does the USB Server get its IP address?
- How does the USB Server get the valid subnet mask and gateway address?
- How are USB servers prevented from getting an undesired IP address in DHCP environments?
- How do you reset the USB-Server to its factory defaults?
- Where do I find the current versions of the firmware, manuals, tools etc. for the USB-Server?
- How can a record of the network traffic be recorded?
- How are USB-Servers inventoried in the network?
- Why can’t the USB-Server be reached under the "old" IP address after it has been replaced?
- How does the USB-Server get its basic parameters of IP address, subnet mask and gateway address?
The following methods can be used to assign the USB-Server its initial IP address. Detailed descriptions of all procedures are contained in the corresponding section of the manual for the USB-Server.
Management and inventorying tool WuTility
Using the Scan function of WuTility USB-Servers located in the local subnet are automatically searched and arranged in a list. Devices whose current IP address is 220.127.116.11 (= factory default) can be assigned valid address parameters using the IP Address button.
Assigning using DHCP
In centrally administered networks you can also assign the IP address using a DHCP server. In such centrally administered environments please contact the appropriate system administrator before connecting the USB-Server and ask for a fixed IP address for the USB-Server to be reserved in the DHCP system.
The standard method for restoring the factory defaults is to use Web Based Management. After login the USB-Server can be reset to its factory defaults using the path Config >> Session Control >> Logout >> Factory Defaults. The IP address is then reset to 18.104.22.168, which requires reassignment using the WuTility tool.
Manual for the USB Server
Where do I find the current versions of the firmware, manuals, tools etc. for the USB-Server?
The fastest way is to go to the Insider search from our homepage. Enter the article number of the USB-Server and select the desired item from the menu located below.
How can a record of the network traffic be recorded?
All terminal devices which are connected to a network can experience communications problems for which no cause can be found at first glance. In such cases it is helpful to record the data traffic for these devices using a network analyzer. Instructions on how to do this can be found here.
How are USB-Servers inventoried in the network?
With the help of the free USB-Server management and inventorying tool WuTility for Windows. This automatically finds all USB-Servers located in the respective subnet as well as all other W&T devices (including those with no valid IP address) and creates a list with their key basic information. Other functions include direct starting of Web Based Management, initial assignment of IP addresses, and software updates.
Manual for the USB Server
Why can’t the USB-Server be reached under the "old" IP address after it has been replaced?
The reason frequently lies in the prompt use of an identical IP address for two devices with different MAC addresses. TCP/IP devices keep a dynamically updated ARP table which contains the associations of IP with MAC addresses. When a replacement USB-Server having the same IP address as its predecessor is placed in service, before communication is resumed the "old" ARP entry may have to be deleted in the last IP protocol processing device before the USB-Server.
ARP entries are automatically deleted after some time has passed without any data flow, so that if a longer time period passes between device replacement and resumption of communication, no manual deletion is needed. In addition, at restart the USB-Server generates special ARP packets which serve to update the ARP cache of newer TCP/IP stacks and switches.
Example 1: A Windows computer communicates with a USB-Server in the same IP subnet without use of a router. In this case it is sufficient to delete the no longer valid ARP entry using the following command: arp -d [IP address]
Example 2: Communication with a USB servers takes place through one or more routers. After a unit is replaced the ARP entry for the last router before the USB-Server (gateway) must be deleted. The specific procedure can be found in the documentation from the respective manufacturer.
Note: Since switches also process and save the MAC addresses of the connected devices, these must also be taken into account when replacing a device.