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Dynamic IP address
DynDNS (Dynamic DNS)
Ethernet
Firewall
Gateway
HTTP proxy
HTTPS (Hyper Text
Transfer Protocol Secure)
Hub
Internet
IP (Internet Protocol)
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A dynamic IP address is assigned automatically via DHCP to a network device. As a
result, the IP address of a network device differs every time the device logs in or at
periodic intervals.
The ISP assigns dynamic IP addresses to network devices that are not online con-
tinuously, i.e. integrated in the network. Dynamic IP addresses are reassigned to other
devices, as the number of addresses is limited. Web server OZW775 (online
permanently) does not use a dynamic IP address.
The DNS server assigns domain names and IP addresses. Dynamic DNS (DynDNS) is
needed for dynamic IP addressing. It allows deployment of a network device with
dynamic IP address on the Internet.
DynDNS ensures that a service is always available on the Internet under the same
domain name regardless of the current IP address.
www.dyndns.org
is a free-of-charge DynDNS service. This ISP allows for registering a
domain name, e.g. synco.dyndns.info. The web server can then be reached under
http://synco.dyndns.info.
Ethernet is a network technology for local networks (LAN). Ethernet works at 10 or 100
Mbps transmission rates.
A firewall protects networks against unauthorized access from the outside. Firewalls
are hardware and/or software measures designed to control data exchange between
the private network to be protected and an unsecured network (e.g. the Internet).
A gateway is a device connecting networks of different architecture (addressing,
protocols, interfaces, etc.). Although not entirely correct, the term often is used
interchangeably with router.
An HTTP proxy is a server used by network devices for Internet traffic. All requests are
sent via the proxy server.
The web server OZW775 does not support HTTPS (Hyper Text Transfer Protocol
Secure). E-mails are sent unsecured and unencrypted, i.e. without SSL/TSL.
A hub in a star-topology network connects various network devices by receiving all data
from one device and forwarding it to other devices.
The Internet is a data network with millions of members. A number of protocols are
used to exchange data, summarized under the term TCP/IP.
All devices connected to the Internet can be identified via IP address. The DNS server
assigns domain names to IP addresses.
The IP protocol is a TCP/IP protocol. It is responsible for addressing devices on a net-
work based on IP addresses and transmitting data packages from sender to recipient.
The IP protocol determines the order and network connection used to send data
packages (routing).
The transmission control protocol TCP reassembles the data packages in the right
order at the recipient.
Commissioning instructions OZW775 V2.01
Appendix
CE1C5663en
22.06.2012
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