NTI ENTERPRISE ENVIRONMENT MONITORING SYSTEM73More on IP FilteringThe most common approach is to only allow “white-listed” IP addresses, subnets, or networks to access the device while blockingall others. The IP Filters are processed sequentially from top to bottom, so it is important to place the most precise rules at the topof the list and the most generic rules at the bottom of the list.As an example, assume we wish to block all connections except those which come from the IP address 192.168.1.100. To allowconnections from 192.168.1.100, we need to configure and enable an ACCEPT rule at the top of the list:Then, to block all other IP addresses from connecting to the ENVIROMUX, we add a rule to drop all other connections.If the preceding “drop all connections” rule was placed in position one, no connections at all would be allowed to the unit.Remember: rules are processed from top to bottom. As soon as a rule matches, the processing stops and the matching rule isexecuted.To match a particular IP address, simply enter in the desired IP address (e.g. 192.168.1.100).To match a subnet, enter in the subnet with the associated mask (e.g. 192.168.1.0/24).To match all IP address, specify a mask of 0 (e.g. 0.0.0.0/0).System InformationThe system information page displays the model name of the ENVIROMUX, the firmware version in the ENVIROMUX, the MACaddress of the Ethernet port, the IP mode, and the network configuration. To view the System Information, select SystemInformation in the Administration section of the main menu.Figure 80- System Information pageIP address and gatewayassigned to SIM card with 3GData support
