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The console server has a number of out-of-band access capabilities and transparent fail-over features, to ensure high availability.
So if there’s difficulty in accessing the console server through the main network path, all console server models provide out-of-
band (OOB) access and the Administrator can still access it (and its Managed Devices) from a remote location.
All console server models support serially attaching an external dial-up modem and configuring dial-in OOB access. Some models
with USB ports support attaching an external USB modem. Some models also come standard with an internal modem. These
modems can also be configured for dial-in OOB access.
All console server models with an internal or externally attached modem (and V3.4 firmware or later) can be configured for out-dial
to be permanently connected .
The advanced console server models can also be configured for transparent out-dial failover. So if the principal management
network is disrupted, an external dial-up ppp connection is automatically established.
These advanced console server models can also be accessed out-of-band using an alternate broadband link and also offer
transparent broadband failover.
Models with an internal cellular modem can be configured for OOB cellular access or for cellular transparent failover or can be
configured as a cellular router.
6.1 DIAL-UP MODEM CONNECTION
To enable dial-in or dial-out you must first ensure there is a modem attached to the console server.
All LES1700 come with an internal modem that can provide for OOB dial-in access. These models will display an Internal Modem
Port tab under System > Dial as well as the Serial DB9 Port tab.
The LES1516A, LES1532A, LES1548A, and LES1600 models also support external USB modems. The USB modem will be auto-
detected and an External USB Modem Port tab will come up under System > Dial in addition to the Serial DB9 Port tab. All console
server models support an external modem (any brand) attached via a serial cable to the console/modem port for OOB dial-in
access.
The serial ports on the LES1600 are, by default, all configured as RJ serial Console Server ports. Port 1 can be configured to be the
Local Console/Modem port.
6.2 OOB DIAL-IN ACCESS
Once a modem has been attached to the console server, you can configure the console server for dial-in PPP access. The console
server will then await an incoming connection from a dial-in at remote site. Next, the remote client dial-in software needs to be
configured to establish the connection between the Administrator’s client modem to the dial in modem on the console server.
CHAPTER 6: FIREWALL, FAILOVER AND OOB ACCESS
