38 NETLink
®
Ethernet Products
7.5 Security page
The security page serves as a configuration interface that allows
users to set up access restrictions.
After the security query (see 7.4) has been correctly answered, the
user has write-access to all parameters that are implemented for
TCP security etc.
Up to 12 IP addresses can be added to the device’s whitelist. In
order to use the TCP access list, the corresponding “ON” option
must be enabled (individual list entries are disabled by default).
Whitelisted IP addresses must be entered using the four-octet
format (e.g.: 192.168.4.59). If you want to delete a whitelisted ad-
dress or undo its addition to the whitelist, simply select “OFF” in
the corresponding row.
Once the configuration is saved, only stations that are whitelisted
in this table will be able to establish TCP connections to the NET-
Link
®
unit.
TCP/IP addresses that are not in the white list have read-only ac-
cess to the web interface. MPI, PPI, or PROFIBUS functionalities
cannot be used. The configuration of the NETLink
®
is also
prevented.
It is also possible to activate additional write protection (primarily
for CPUs) for any bus nodes connected to the NETLink
®
. If the
NETLink
®
is used, for example, as a communications adapter for
representing visualization values, only data from the connected
controllers can be read out if write protection is active. In this
way, manipulation of the CPU sequential program is ruled out.
This assumes, of course, that the access data for the NETLink
®
web
interface are secure.
Attention: To prevent their use by unauthorized persons, any
proxy servers that exist in company networks may not be entered
in the white list. If so, safe use of a NETLink
®
Gateway is not
guaranteed.
With the button ‘Factory defaults’ it is possible to restore all pa-
rameters to the as-delivered state of the NETLink
®
device. All user-
defined configurations will be deleted by this function.
By clicking the ‘Submit’ button, the inputs are checked for plausi-
bility. You may then be shown which inputs are incorrect and
what correct input would look like at this point.
If all your settings are consistent, you will be shown the changes
you made the way they will be stored in the NETLink
®
unit’s non-
volatile memory after you click on the “Store” button.
After the new parameterization data have been stored, the NET-
Link
®
is restarted to activate the new configuration.
A NETLink
®
can be started both locally and remotely via the
security interface. This can be done by clicking the ‘Device Reboot’
button.
Every submenu features
a Help button that can
be used to access descri
p-
tions of relevant details
and functions.
Notice deviation by usage
of proxy servers.
Rebooting can take up to
15 seconds.
d-
dresses on the whitelist,
you will no longer be able
to reconfigure the
NETLink
®
device from an
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