Perle Systems DS1 - Manual (Page 40)

Configuring Network Options
40 IOLAN Device Server User’s Guide, Version 1.0
Sessions
Sessions are defined for users who are coming in through a serial device going to a host on the LAN.
Users who have successfully logged into the Device Server (
User Service set to DSprompt ) can start
up to four login sessions on LAN hosts. These users start sessions through the Menu option
Sessions .
Multiple sessions can be run simultaneously on the same host or on different hosts. Users can switch
between different sessions and also between sessions and the Device Server using hotkey commands.
Users with
Admin or Normal privileges can define new sessions and connect through them, even
configure them to start automatically on login to the Device Server. Restricted and Menu users can
only start sessions predefined for them by the Admin user.
You can configure the User access rights to the port, such as
Read/Write (RW), Read Input (RI),
Read Output (RO) and Read Both (RI & RO).
Users From LAN to Device Server to Serial Device
Easy Port Access Menu
The Easy Port Access Menu is displayed when a Restricted or Menu level user logs into the box
from the Ethernet side ( Line Service set to Rev Telnet ) to access a serial device. The Easy Port
Access Menu displays the line number, line name, line protocol, and a logout option. You can only
access the line if it has the same connection protocol as the one you used to log into the Device
Server. So, if you used SSH to log into the Device Server and the
Line Service is set for Rev Telnet ,
you will not be able to access the serial device connected to that line.
Reverse Sessions
You can specify the number of reverse connections (1 to 4, default 1) that are allowed at same time
with the
Reverse Session Limit parameter. If users are connecting to the Device Server IP address
only, they will be automatically connected to the Device Server unless the Reverse Session
Security parameter is enabled. If users are connecting to the Device Server IP address and port
number, they will always have to log into the Device Server.
Configuring Network Options
Hosts
This is probably one of the first Device Server options you want to configure, since so many other
configuration options require a preconfigured host. You can use any host name you want, since the
host name is used only by the Device Server. You can configure up to 20 hosts using IPv4 or IPv6
internet addresses.
Gateways
Gateways are hosts that connect Local Area Networks (LANs) together. If you want to access a host
that isn’t on your local network, you will be connected via a gateway. Gateways route data via other
gateways until the destination local network is reached. There are three types of gateways:
z Default—A gateway that provides general access beyond your local network.
z Host—A gateway reserved for accessing a specific host external to your local network.
z Network—A gateway reserved for accessing a specific network external to your local network.
You can specify up to twenty gateways.