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Basic Configuration
• SYSLOG Address: The IP Address or domain name (up to 64 characters) for the
Syslog Daemon that will receive log records generated by the MPC. For more
information, please refer to Section 11. (Default = undefined.)
• Ping Access: Enables/Disables response to the ping command. When Disabled,
the MPC will not respond to Ping commands. Note that disabling Ping Access at
the Network Port will not effect the operation of the Ping-No-Access Alarm.
(Default = On.)
5.9.3. IP Security
The IP Security feature allows the MPC to restrict unauthorized IP addresses from
establishing inbound Telnet connections to the unit. This allows you to grant Telnet
access to only a specific group of IP addresses, or block a particular IP address
completely. In the default state, the MPC accepts incoming IP connections from all
hosts.
In the Text Interface, IP Security parameters are defined via item 5 in the Network
Configuration menu (Figure 5.17.) In the Web Browser Interface, these parameters are
found by clicking the "IP Security" link on the left hand side of the screen. In the default
state, IP Security is disabled.
The IP Security Function employs a TCP Wrapper program which allows the use of
standard, Linux operators, wild cards and net/mask pairs to create a host based access
control list.
The IP Security configuration menus include "hosts.allow" and "hosts.deny" client lists.
Basically, when setting up IP Security, you must enter IP addresses for hosts that you
wish to allow in the Allow list, and addresses for hosts that you wish to deny in the Deny
list. Since Linux operators, wild cards and net/mask pairs are allowed, these lists can
indicate specific addresses, or a range of addresses to be allowed or denied.
When the IP Security feature is properly enabled, and a client attempts to connect, the
MPC will perform the following checks:
1. If the client’s IP address is found in the "hosts.allow" list, the client will be granted
immediate access. Once an IP address is found in the Allow list, the MPC will not
check the Deny list, and will assume you wish to allow that address to connect.
2. If the client’s IP address is not found in the Allow list, the MPC will then proceed to
check the Deny list.
3. If the client’s IP Address is found in the Deny list, the client will not be allowed to
connect.