Siemens SIMATIC NET CP 343-1 Manuale Utente Pagina 46

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Notes on configuration and operation
6.13 Permitted length of ICMP packets
CP 343-1 Lean
46 Manual, 10/2012, C79000−G8976−C198−07
6.12.2 Programmed communications connections - assigning parameters to the ports
The CP supports the following settings when assigning parameters to the ports in the
parameter block for TCP connections and UDP connections:
SUB_LOC_PORT parameter
The port can be specified as an option when the connection is established actively.
SUB_REM_PORT parameter
The port can be specified as an option when the connection is established passively.
6.13 Permitted length of ICMP packets
Permitted length of ICMP packets
Pings with a packet size of more than 1000 bytes are evaluated as an attack and filtered by
the CP. This response is intentional and improves the robustness of the CP in an industrial
environment.
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