ST Micro Connect 2
Choosing an IP address
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D.3
Selecting a USB IP address
USB devices are connected directly to a host-PC and are accessed from the host
(c)
.
Each ST Micro Connect 2 connected to a host must be on a unique
subnet
.
D.3.1
USB IP address allocation strategy
It is expected that a small number of ST Micro Connect 2s, one or two, will be connected to
a host by USB. Each ST Micro Connect 2 connected to a host must be on a unique subnet.
The default IP addresses chosen for the ST Micro Connect 2 are private LAN address range
192.168/16, defined in
RFC 1918 Address allocation for private internets
. This address
range provides for 256 contiguous class C networks of 256 hosts.
It is possible that your network already utilizes part of this address range for other local
equipment, so be careful not to introduce a conflict when allocating addresses.
When it is required to make ST Micro Connect 2s available to other hosts on a network it is
recommended that this is done using Ethernet rather than USB. This ensures a unique
Ethernet address. ST Micro Connect 2s connected locally by USB are not normally visible to
other hosts, and so an ST Micro Connect 2 connected to host A, can use the same (USB) IP
address as an ST Micro Connect 2 connected to host B.
For a class C address, the first three octets define the network element of the address. For
the default address therefore, the network address is 192.168.2. The simplest way to
allocate unique network addresses to ST Micro Connect 2s is to increment the default
address. For example, if four ST Micro Connect 2s A, B, C and D are to be connected to a
single host, they might be given the IP addresses:
192.168.2.1
ST Micro Connect 2 A
192.168.3.1
ST Micro Connect 2 B
192.168.4.1
ST Micro Connect 2 C
192.168.5.1
ST Micro Connect 2 D
See
Section 3.2 on page 15
for instructions on setting the USB IP address.
D.4 Possible
network
conflicts
This section describes some possible network conflicts.
●
Each ST Micro Connect 2 has two network interfaces, Ethernet and USB, with no
possibility in the user interface to disable either one. ST Micro Connect 2 software
treats both as always 'live', using factory default settings if no user settings have been
applied. You must therefore ensure there is no conflict between the IP configurations of
the ST Micro Connect 2's two network interfaces
even if one is not used
.
●
A host may have other network interfaces (LAN, ADSL...) in addition to those used to
connect to the ST Micro Connect 2. You need to ensure that there are no conflicts
c.
It would be possible to make an ST Micro Connect 2 connected to a host by USB, to be made available to a
wider network. This is not described here. If network access is required then connect the ST Micro Connect 2
to the network using Ethernet.
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