ELSA Cable - Manual (Page 38)

Operating modes and functions
ELSA MicroLink Cable
30
a password to gain access to a network, a computer or another device. In order to do so,
a computer can, for example, go through all the possible combinations of letter and
numbers until the right password is found.
As a measure of protection against such attacks, the maximum allowed number of
unsuccessful attempts to Login can be set. If this limit is reached, the access will be
barred for a certain length of time.
These parameters apply globally to all configuration options (telnet, TFTP/ ELSA
LANconfig and SNMP). If barring is activated on one port all other ports are
automatically barred too.
The following entries are provided in the configuration tool ELSA LANconfig for
configuring login barring in the 'Management' configuration area on the 'Security' tab or
under
/Setup/Config-Module in the menu:
࡯
'Lock configuration after' ( Login-errors )
࡯
'Lock configuration for' ( Lock-minutes )
Access control via TCP/IP
Access to the internal functions of the devices through TCP/IP can be restricted using a
special filter list. Internal functions in this case means Telnet or TFTP sessions to
configure the
ELSA LANconfig.
This table is empty by default and so access to the router can therefore be obtained by
TCP/IP using Telnet or TFTP from computers with any IP address. The filter is activated
when the first IP address with its associated network mask is entered and from that point
on only those IP addresses contained in this initial entry will be permitted to use the
internal functions. The circle of authorized users can be expanded by inputting further
entries. The filter entries can describe both individual computers and whole networks.
The access list can be found in the configuration tool ELSA LANconfig in the 'TCP/IP'
configuration section on the 'General' tab, or in the /Setup/TCP-IP Module/
Access List menu.
Security for your LAN
You certainly would not like any outsider to access or edit the data on your computers.
A
ELSA MicroLink Cable offers you various ways of restricting access from outside:
࡯
Data encryption
࡯
Data packet filtering
࡯
IP masquerading (also known as NAT or PAT)