Lantronix MSS4-D, Руководство по установке

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Using the MSS Multihost Mode
5-11
5.5.2 UDP Configuration
When the UDP protocol is used, there is no connection; each MSS serial port must be told
explicitly which host it is allowed to accept packets from. For UDP, each MSS port has to
be configured to both send packets to and accept packets from the other MSS.
MSS_A
Local>> CHANGE PORT n DEDICATED TCP 192.168.5.10:4096U
Local>> CHANGE PORT n AUTOSTART ENABLED
Local>> CHANGE PORT n ACCESS DYNAMIC
MSS_B
Local>> CHANGE PORT n DEDICATED TCP 192.168.5.2:4096U
Local>> CHANGE PORT n AUTOSTART ENABLED
Local>> CHANGE PORT n ACCESS DYNAMIC
Repeat the above steps for each additional serial tunnel.
Setting up Dedicated hosts ensures that the specified ports will always talk only to each
other. Enabling Autostart for both ports enables one MSS to send data to the other MSS
without having to wait for a serial carriage return to start the session. The second MSS
knows exactly which other MSS to accept connections from. Finally, when Autostart is
enabled, the access mode must be either Local or Dynamic (Dynamic is more flexible).
5.6 Multihost Mode
Multihost mode sets up a data pipe between one of the serial devices attached to the MSS
and multiple hosts on the network. Data from a network host goes out of the specified MSS
serial port, and data from the serial port is sent to all connected network hosts. The MSS
does not alter the data in any way, it merely forwards the data from one point to another.
There are a few important things to note about multihost connections:
◆
The MSS attempts to send data in the order it is received. That is, it reads in and
sends data from one host before reading in data from another host.
◆ The MSS will ping TCP and UDP hosts before sending connect attempts to make
sure the remote hosts are alive. If they are alive, the MSS connects for real and
passes the data. If not, the MSS will retry later. Similarly, if one of the host
connections is terminated prematurely, the MSS will attempt to reconnect at preset
intervals.
Note:
Retry affects the data flow to all hosts, so you should remove
unreliable hosts from the host list.
◆ If a host’s flow control or other settings block the MSS from sending, the MSS will
skip that host and send the data to the other hosts. This will result in data loss for the
unavailable host.
◆ When one of the MSS serial ports logs out, all host sessions are disconnected,
leaving the port idle.