Hardware manual

PC to Device - Internet connection Impact Reference Guide
Datalogic Automation Inc. 6-34
PC to Device - Internet connection
The two smart switches should be able to ping one another. For "discovery" to work, multicast must be
enabled. It is disabled by default on most routers.
Broadcasts are data packets sent to all nodes on a subnet and every node hears them. These broadcast pack-
ets can never cross routers.
Multicast packets are special. They are only heard by nodes that are configured to hear them. Multicast
receivers (nodes) 'tune in' to listen to specific multicast packets. This is similar to tuning to a radio station.
Server based network Internet access via a firewall and multiple subnets
Smart Switch
Subnet A = 192.168.xxx
Gateway: 192.168.xxx.n
VPN Firewall/Router
10/100 Ethernet
connections
Smart Switch
Subnet B = 192.168.yyy
Gateway: 192.168.yyy.m
PC on Subnet B
IP Address: 192.168.yyy.mm1
Subnet: 255.255.254.0
Gateway: 192.168.yyy.m
Impact Device on Subnet B
IP Address: 192.168.yyy.mm2
Subnet: 255.255.254.0
Gateway: 192.168.yyy.m
PC on Subnet A
IP Address: 192.168.xxx.nn1
Subnet: 255.255.254.0
Gateway: 192.168.xxx.n
See “Impact software TCP Ports” on page 6-
28 for details on Impact Device ports used.