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Table of Contents
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General description
CHARON-AXP supports emulation of the following network adapters:
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By default the PCI Ethernet adapters use first available PCI slot. If instead some particular slot is needed, refer to this section for details of specific placement of PCI peripherals on CHARON-AXP PCI bus.
Network booting is not currently supported.
Configuration steps
To configure CHARON-AXP networking, follow these 3 steps:
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The interface name can be either " Examples:
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The AlphaServer DS 15 DS15 and DS25 contain two built-in PCI Ethernet adapters. Models and names (EI* or EW*) of them depend on configuration addon. Choose one of the two or none, but not both. The first instantiates onboard network interfaces as EIA and EWA. While the second - EWA and EWB (enabled by default for backward compatibility) Example:
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Configuration parameters
Each virtual network controller has the following parameters that are specified with the "set" command:
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| Parameter | station_address | |||
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| Type | Text String | |||
| Value | The "station_address" provides the ability to configure the adapter’s permanent address. By default the adapter’s permanent address is read from the host system’s NIC. Format:
or
Example:
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rx_fifo_size
| Parameter | rx_fifo_size |
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| Type | Numeric |
| Value | "rx_fifo_size" sets the receive FIFO size. The value is specified in Kb and, by default, is pre-calculated from the connected port’s size of the receive queue. Typically, you do not need to change the "rx_fifo_size" parameter. It is available for extended tuning and debugging purposes. |
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| Parameter | adapter_mode | |||||||||||||
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| Type | Text String | |||||||||||||
| Value | Defines the link speed and the duplex settings of the virtual network adapter (except for DE602/DE602AA - see below). The values are:
Defines the link speed and the duplex settings of the virtual network adapter (except for DE602/DE602AA - see below). The values are: Example:
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Example:
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DE602 and DE602AA network adapters link speed and duplex settings
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The EIx0_MODE variable name is case insensitive, while its values are case sensitive! This is feature of OpenVMS EIDRIVER.
The values are:
| Parameter | Description |
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| "Auto" | Auto-negotiate (default) |
| "Twisted" | 10Mbps half duplex |
| "Full" | 10Mbps full duplex |
| "Fast" | 100Mbps half duplex |
| "FastFD" | 100Mbps full duplex |
Example:
>>>set eia0_mode FastFD |
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Packet Port
The CHARON-specific "packet_port" interface establishes a connection between an Ethernet adapter in the Linux host system and a network adapter in the virtual HP Alpha system.
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| Parameter | interface | ||
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| Type | Text string | ||
| Value | This parameter identifies an Ethernet adapter of the host system dedicated to CHARON-AXP. Syntax:
Example:
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port_enable_mac_addr_change
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| Parameter | port_retry_on_tx | |
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| Type | Numeric | |
| Value | The "port_retry_on_tx" parameter controls the number of times a port will attempt to transmit a packet before giving up. By default, the value is 3. Increasing this value may introduce problems in carrier loss logic, because not all NIC drivers support a carrier status query. Typically, you do not need to increase the value. Example:
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port_pending_rx_number
| Parameter | port_pending_rx_number | |
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| Type | Numeric | |
| Value | The "port_pending_rx_number" parameter sets the number of pending receive buffers. The default value is 63. The maximum value allowed is 195. You may want to increase the "port_pending_rx_number" when you have very busy networking and experience problems like losing connections not related to the carrier loss. Typically, you do not need to change this parameter. Example:
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| Parameter | port_pending_tx_number | |
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| Type | Numeric | |
| Value | The "port_pending_tx_number" parameter sets the number of buffers the port uses to transmit. The default value is 62. You may want to increase the "port_pending_tx_number" value if the log file indicates dropped TX packets due to TX queue overflow. Typically, you do not need to change this parameter. Example:
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log
| Parameter | log | ||||
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| Type | Text string | ||||
| Value | If this parameter is set to some valid file name or a directory where the log files for each individual session will be stored CHARON logs Recv and Xmit packets at the emulated port layer. If an existing directory is specified, CHARON automatically enables creation of individual log files, one for each session using the same scheme as used for the generation of the rotating log files. If the "log" parameter is omitted, CHARON does not create log. In certain situations enabling this parameter may help to detect loss of packets. Example:
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Example
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CHARON-AXP supports VLAN adapters. If for some reasons you are going to use them, proceed with their installation and configuration according to the network adapter's vendor's User's Guide and then use the resulting VLAN interface the same way as the regular network interface. |
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