37
browsing
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the windows network. If the windows network has a WINS
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server for
providing a network directory, the IP Address could be specified here.
FTP Server Settings
Aside of the possibility to enable or disable the FTP service, the port
13
number of that
server could be modified in order to accommodate a possible port forwarding
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of a
internet access router which uses NAT
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, for example if it is desired to make two IB-
NAS2001 accessible via port forwarding by an internet access router.
Attention:
Changing the FTP servers port from 21 (default) to another value will
cause, that standard FTP client will not be able to access the IB-
NAS2001 FTP server, except the changed port number is configured in
the FTP client appropriately.
NFS Server Setting
Here the NFS Server can be enabled or disabled.
Guest Access Setting
By default the IB-NAS2001 has a preconfigured account for guest access respectively
anonymous access. This means that via Windows share and FTP there is a guest
folder/share which could be accessed anonymously without a user/password
authentication.
Attention:
Leaving the guest access enabled means a high level security risk when
the IB-NAS2001 is exposed to the internet or any public network. This
can lead to malicious abuse.
If you expose the IB-NAS2001 to any
public network, it is strongly recommended to disable the Guest
Access.
The reason why the default setting is enabled is to ensure that the IB-NAS2001 is readily
accessible when used the first time.
In addition to enabling and disabling that feature a Quota for that account could be
defined for restricting the quantity of disk used by users accessing the IB-NAS2001 via
guest settings.
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Browsing signifies here a process of Windows to discover and display network participants.
12
WINS is an acronym for “Windows Internet Naming service”. Windows knows two ways of name resolution (process of
assigning IP addresses to IP Addresses) one is a broadcast based mechanism and the other is WINS, where some network
participants take over the role of a directory server called WINS server, registering names and services of other network
participants.
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Network participants in a TCP/IP (Internet) based network structure are addressed via IP Addresses, but as you can see a
network participant can offer for example different services. To address different services at a network participant using a
singular IP Address there is a subordinated identifier called port. The port is specified by a number between 0 an 65535. Ports
between 1 and 1024 are so called “well known ports”, which means that in the internet exists a common assignment of services
towards these ports. For example 21 is commonly used for FTP, 80 is commonly used for http (web). This association is not a
must. The port associated with a service can be changed. The other communicating party then must specify the port number
explicitly, if it differs from the common principle. Such a change of port numbers makes sense if a network participant wants to
offer two different services of the same kind using the same IP Address.
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Port forwarding names a process where a router using NAT associates a port of the external IP Address to a port and IP
Address of an internal network participant and forward all traffic from outside destinated towards that particular external port
towards the defined internal IP Address and port number.
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NAT is an acronym for network address translation. Most internet access routers at home are using this technique. It is used
when a router has just one public IP Address for accessing the internet but has to connect several computers of a private
network. So the router maps all traffic from the inside of the network to a singular external IP Address by changing the port
number. It therefore uses a mapping list associating the internal IP Addresses and port of a network communication with an
external port. This list is dynamic and the associations are deleted after a certain period of time. A network participant from
outside therefore can’t address an internal one if the communication hasn’t been initiated from the internal partner.
Summary of Contents for IB-NAS2001
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