Intel® Server System S7000FC4UR TPS BMC Messaging Interfaces
Revision 1.0
283
Session establishment commands are IPMI commands that do not require authentication or an
associated session.
The BMC supports the following authentication types over the LAN interface.
None (no authentication)
Straight password / key
MD5
23.4.2 ESB2 Embedded LAN Channels
Even though the ESB2 embedded NICs are shared by the BMC and the server, sharing only
means that both the BMC and the server use the same NIC. These shared NICs provide a
dedicated MAC address solely for BMC use. As a result, in some ways these channels are more
similar to a dedicated LAN channel than a shared channel. The IP address for the server is
always different from the BMC IP address for an embedded NIC.
For these channels, support can be enabled for IPMI-over-LAN, ARP, and DHCP.
As an integral part of the ESB2, the BMC has a can access to and control the primary network
interfaces. All LAN features for a given LAN channel are disabled unless the channel’s access
mode is set to Always Enabled.
If an Intel
®
Remote Management Module is installed, then the ESB2 embedded LAN channels
are configured differently.
23.4.2.1 Dedicated MAC Address
Each of the ESB2’s two NIC channels has a unicast MAC filter reserved BMC use. These filters
enable the BMC to receive network data streams that are logically separate from, and invisible
to, operating systems and software running on the server, despite sharing the same physical
LAN connections. This allows the BMC to support features beyond standard IPMI-over-LAN,
such as DHCP, full ARP request / response, and ICMP, without requiring a separate Ethernet
cable. This also allows an Intel
®
Remote Management Module add-in card to have nearly full
access to the ESB2 embedded NICs in a shared NIC configuration. To prevent users from
disrupting the BMC’s ESB2 LAN configuration, the BMC treats LAN configuration parameter 5,
MAC Address, as read-only for ESB2 NICs. Using the Set LAN Configuration Parameter
command to attempt to change the MAC address on an ESB2 NIC has no effect, and the BMC
returns error code 0x82, Attempt to write a read-only parameter, per IPMI errata E394.
23.4.3 Address Resolution Protocol (ARP)
The BMC can receive and respond to ARP requests on ESB2 NICs, and can also generate
gratuitous ARPs.
For gratuitous ARP support, the gratuitous ARPs bit (bit 0) in the Set LAN Configuration
Parameter command needs to be set and the LAN interface needs to be active (IPMI-over-
LAN).
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