Raritan Dominion SX II, Руководство администратора

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Appendix C: FAQs
257
Serial-over-IP Sessions and Access
What types of serial access are
available?
The SX II has the widest variety of serial
access. This includes: SSH, Telnet and
web browser serial connections. Web
browser access is available via the Raritan
Serial Client and through Raritan
CommandCenter. Convenient Direct Port
Access (DPA) methods are available. At-
the-rack access is available via serial cable,
USB and via a KVM console. Emergency
modem access is available via optional
internal modem or external 3G/4G cellular
modem.
What is Direct Port Access ?
Direct Port Access provides direct and
convenient access to a specific serial
device connected to the SX II. Multiple
Direct Port Access (DPA) methods are
available via SSH, Telnet and HTTP/URL.
Does the SX II support TELNET?
TELNET is supported, but is disabled by
default for security reasons as TELNET
does not support encrypted sessions. We
recommend that SSH is used instead of
TELNET.
What about emergency access via
modem?
There are two types of modem access
supported. First, an internal telephone
modem is optional for each SX II model
(DSX2-...M models). Second, for 3G/4G
cellular modem access, you can connect
the Sierra Wireless Airlink GX440 wireless
modem to the SX II's USB port and access
the SX II via the modem's IP address.
How can I secure the Sierra Wireless
modem?
You can use the SX II's Firewall feature to
create Linux-style "iptable" rules to secure
the connection to the wireless modem. In
addition the modem itself has a firewall
capability.
How can I access the SX II when I am
in the data center?
The Dominion SX II provides multiple types
of at-the-rack access. To connect to a
laptop or PC you can connect to its RJ45
serial port or USB mini-B port. You can
connect a crash cart or rackmount keyboard
tray to the SX II's DVI and USB KVM ports.
To access the SX II's web-based user
interface, connect a crossover Ethernet
cable to the SX II's LAN port.
How can I get consolidated access to
the local ports of multiple SX II's?
There are two ways to do this. First you
can connect the serial admin ports of