Siemens CP 1515 User Manual page 291

Industrial ethernet wireless lan rlm manager
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Each subnet is identified by the Subnet Mask.
allow mobile stations to roam between different wireless cells,
all wireless stations and access points must be connected to the
same LAN subnet.
An advanced IP Parameter Setup counter that you can you use to
maintain network efficiency. The purpose of the Time To Live counter
(TTL) is to avoid endless forwarding of message frames with an
incorrect address that pollute the network medium.
The TTL defines a maximum number of passes per hop. Each time
the frame is forwarded by a router, the TTL counter decreases by one.
When the TTL = 0, the frame is rejected.
The number of subnetwork-frames delivered to a higher protocol. This
is 'true data' from station to station.
Industrial Ethernet Wireless LAN RLM Manager, CP 1515 Manager
C79000-G8976-C171-01
SIMATIC NET IWL roaming does not work over routers. To
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