semaphore TBOX LT2-530 Series, User Manual, Page: 107 / 197

Version : 1.09 107
11.2.2. Firewall “Forward”
When Firewall has been activated from the RTU properties, IP forwarding, NAT and Virtual Servers
rules are blocked.
By defining forward rules, you will control data communication between ports.
A rule defines an exception: the control of interconnection between ports is based on:

2 x IP communication ports (IN -> OUT)

Protocol

TCP Port

Source IP address

Destination IP address
The Forward entries provide automatically Firewall rules to the outgoing port.
Concerning the incoming port, make sure you have defined input rules.
Communication Ports: Select both ports concerned by data forwarding (From .. To).
Services:
Any: all IP services are forwarded. Protection can be based on IP only (see below).
Custom: you select the protocol and the TCP port yourself (see below).
ModBus, FTP, HTTP, HTTPS: server services available in TBox. Protocol is set by default to
"TCP" and the port as defined in "RTU properties" -> "Advanced TCP /IP".
Protocol: If you have selected "Custom" as service (see above):
Any: all protocols (UDP, TCP, ICMP) are forwarded. Protection can be based on TCP port
and/or IP (see below).
UDP, TCP, ICMP: you select the protocol yourself.