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6.2
Port Forwarding
If a rule has been created for port forwarding, then data packets received at a
defined IP port of the SINAUT MD741-1 from the external network will be
forwarded. The incoming data packets are then forwarded to a specified IP address
and port number in the local network. The port forwarding can be configured for
TCP or UDP.
In port forwarding the following occurs: The header of incoming data packets from
the external network that are addressed to the external IP address of the SINAUT
MD741-1 and to a specific port are adapted so that they are forwarded to the
internal network to a specific computer and to a specific port of that computer.
This means that the IP address and port number in the header of incoming data
packets are modified.
This process is also called Destination NAT or Port Forwarding.
Note
In order for incoming data packets to be forwarded to the defined IP address in the
local network, a corresponding incoming firewall rule must be set up for this IP
address in the packet filter. See Chapter 6.1.
Figure 6-2
New
Adds a new forwarding rule that you can then fill out.
Delete
Removes forwarding rules that have been created.
Protocol
Specify here the protocol (TCP or UDP) to which the rule should refer.
Arrives at port
Specify here the port number (e.g. 80) at which the data packets which are to be
forwarded arrive from the external network.
SINAUT MD741-1
C79000-G8976-C236-05
Security > Port Forwarding
6 Security functions
75
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