8-4
Packet Filter
This section provides an overview of Packet Filter, explains the specifications, settings, and usage ex-
amples.
8-4-1
Introduction to Packet Filter
IP packets are filtered in the receive processing at the EtherNet/IP ports.
Packet Filter settings are configured in the permit list. If any is set in Packet Filter, all packets are al-
lowed. If a value other than any is set in Packet Filter, the received packet is compared with Packet
Filter settings. When a matching packet is received, reception is permitted. When a non-matching
packet is received, reception is prohibited and the packet is discarded. Packet Filter settings include
the source IP address, destination IP address, and TCP/UDP port number.
POWER
PORT2
Ethernet
Packet Filter function
Support software or a device
EtherNet/IP port
Packet
Packet Filter settings
Source IP address Destination portSource port
Destination IP address
Source IP address
Destination port
Source port
Destination IP addressNo.
1 *.*.*.* *.*.*.* *** ***
2 *.*.*.* *.*.*.* *** ***
: : : :
Compare packets in order from No.1 in the list.
If matched: allow to receive the packet
If not matched: reject reception and discard the packet
Precautions for Correct Use
• If you cannot go online with the Sysmac Studio because of forgetting the registered IP ad-
dress, you can disable this function tentatively by starting the Unit in Safe Mode. Refer to
Troubleshooting When Y
ou Cannot Go Online from the Sysmac Studio in the NJ/NX-series
Troubleshooting Manual (Cat. No. W503) for details.
• The Packet Filter function supports the stateful inspection. Therefore, for DNS, DB connec-
tion services, and communication instructions, where the Controller is specified as a client,
you do not need to add the responses from other devices to Packet Filter settings.
8-4-2
Packet Filter Specifications
The specifications for Packet Filter are given below.
Item Specification Remarks
Filtering system Permit list The system enables reception of
packets registered in Packet Filter
settings and prohibits reception of
unregistered packets.
8 TCP/IP Functions
8-15
NX-series EtherNet/IP Unit User's Manual (W627)
8-4 Packet Filter
8
8-4-1 Introduction to Packet Filter
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