Vaisala Hydromet Data Collection Platform - Manual (Page 218)

User's Guide ______________________________________________________________________
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IP Settings
As IP settings depend greatly on the network environment, the aim of
this document is not to provide comprehensive instructions on network
design. The following describes a few basic rules and practices.
Static and Dynamic IP Addresses
- LAN environments typically provide private dynamic addressing
using DHCP, which is supported by the QML logger when using
Ethernet Communication Module DSE101. It is possible to use
static addressing in LAN as well, but then the addresses have to be
provided by the organization operating the LAN.
- Without special operator agreement, public networks such as
telephone, cellular, or broadband do not usually provide static IP
addresses to connected client devices. This means that clients, such
as the QML logger, cannot be directly reached using IP. Dial-up IP
networking can be used when applicable.
- Broadband links, such as ADSL or satellite broadband, are mostly
LAN connections from the QML logger point of view, as in this
case it is usually connected to the communication device using
Ethernet. Depending on communication device configuration and
operator requirements, the operation mode can be:
- Bridged, that is, the communication device performs media
conversion between Ethernet and broadband. IP addressing,
domain name, and other services come directly from
operator's network.
- Routed, that is, the communication device acts as a router
between Ethernet and broadband connection. Router usually
provides IP addressing to connected clients. Often NAT
(Network Address Translation) is also used, making the client
devices connected to Ethernet inaccessible from broadband,
unless configured to the router.
When connecting the QML logger directly to another computer using,
for example, null modem, it is possible to use dynamic or static
addresses. In each case, the settings on both ends have to match.
If a static IP address is used, all other address settings need to be set
manually as well. With dynamic addressing, only the domain name
server addresses can be set manually, if not provided by DHCP or PPP
negotiation.