Users Guide

168 Configuring and Using Serial Over LAN
Model for the SOL Proxy
Telnet Client (port 623) ←→ WAN connection ←→ SOL Proxy ←→
iDRAC6 server
When the SOL Proxy communicates with the Telnet client on a management
station, it uses the TCP/IP protocol. However, SOL proxy communicates with
the managed server's iDRAC6 over the RMCP/IPMI/SOL protocol, which is a
UDP-based protocol. Therefore if you communicate with your managed
system's iDRAC6 from SOL Proxy over a WAN connection, you may
experience network performance issues. The recommended usage model is to
have the SOL Proxy and the iDRAC6 server on the same LAN. The
management station with the Telnet client can then connect to the SOL
Proxy over a WAN connection. In this usage model, SOL Proxy will function
as desired.
Model for Redirecting SOL Over IPMItool
IPMItool ←→ WAN connection ←→ iDRAC6 server
The IPMI-based SOL utility, IPMItool, uses RMCP+ protocol delivered
using UDP datagrams to port 623. iDRAC6 requires this RMCP+ connection
to be encrypted. The encryption key (KG key) must contains characters of
zero or NULL that can be configured in the iDRAC6 Web GUI or in the
iDRAC6 Configuration Utility. You can also wipe out the encryption key by
pressing the backspace key so that iDRAC6 will provide NULL characters as
the encryption key by default. The advantage of using RMCP+ is improved
authentication, data integrity checks, encryption, and the ability to carry
multiple types of payloads. See "Using SOL over IPMItool" or the IPMItool
website for more information: http://ipmitool.sourceforge.net/
manpage.html.
Disconnecting SOL session in SM-CLP
When using SSH or Telnet protocols to access the Serial Over LAN
functionality, you first will be first connecting into the iDRAC’s SM-CLP
service, from which you will launch the SOL session with an SM-CLP
command (start /system1/sol1). Thus, users wanting to disconnect
an SOL session must first terminate the SOL session from SM-CLP.
Commands to disconnect a SOL session are utility oriented. Read this section
carefully. Only when a SOL session is terminated fully can you exit the utility.