Table of Contents

Name

linxcfg - a configuration utility for LINX links to other nodes

Synopsis

linxcfg [-t <cm>] [-v] <command> [COMMAND PARAMETERS and OPTIONS]

linxcfg [-t <cm>] [-v] destroy <linkname> [<link 2>...]

linxcfg -h

linxcfg help <cm>

linxcfg -t <cm> [help]

Description

linxcfg is the LINX configuration utility. Depending on the command given, linxcfg can destroy or create links using the specified Connection Manager (CM).

Options

linxcfg has common options to all commands

which should be placed before the actual command

-h, --help
Display help and exit.

-t, --type <cm>
Specifies cm as the Connection Manager to use. If this option is not provided, eth will be used as the default CM.

You can use -h to list all available CMs.

-v, --verbose
Verbose mode.

-c, --cf, --conn-feature <feature[=value]>
Adds a connection feature. This option can be specified several times.

-l, --lf, --link-feature <feature[=value]>
Adds a link feature. This option can be specified several times.

Commands

create PARAMETERS
Creates a connection link to another node. The PARAMETERS depend on the CM specified, see below for more details.

A remote link cannot be used until also the remote node creates the other end of the link (a link back to the originating node). The state is "connecting" until both sides are ready and communication via the LINX protocol can begin.

destroy <linkname> [<link2>...]
Destroy the connection link with the name linkname.

help [<cm>]
Provides help about the given cm , either specified in -t or after the help command.

If no cm was specified, it will show a list of available CMs.

Options to Different Connection Managers

Ethernet CM

The Ethernet CM is specified with the eth keyword, which is actually the default if no other CM was specified.

The create command takes the following options:

create <macaddr> <interface> <linkname> [OPTIONAL PARAMETERS]

macaddr
Specify the remote mac address of the node to connect to, e.g. 0a:1b:2c:3d:4d:5e.

interface
Specify the Ethernet interface to use. Ex.: eth0.

linkname
Name of the connection link. This is the link part of the path in a remote hunt name to LINX endpoints on the other node. It will also be the name seen in /proc/net/linx/cm/eth/<linkname>

Optional parameters

--window_size=nnn
This is the send/receive window_size, in number of packets on the link, and may need to be modified to adapt LINX to really slow or really fast Ethernet performance.
Both the local and remote side negotiate the window size, being the smallest of the two sizes the selected one. The default 128 messages should be sufficient in most configurations. The window size shall always be of a power of 2. Size 0 means to use the default window size.

--defer_queue_size=nnn
The defer queue size is in packages, with the size depending on the LINX link. The defer queue is used on the sender side when the send queue is full. Every message sent, when the send queue is full, is stored in the defer queue, until the send queue has room for more messages. The defer queue size is the maximum number of packages, with messages, that can be stored in the defer queue before the link is disconnected, due to lack or resources. The default value 2048 packages should be sufficient in most systems. Size 0 means to use the default defer queue size.

--send_tmo=nnn
The send acknowledge timeout specifies the time (in msec) to wait until unacknowledged messages are resent. The default 10 should be sufficient in most systems. Tmo 0 means to use the default timeout.

--nack_tmo=nnn
The retransmission timeout specifies the time (in msec) to wait until nack messages are resent. The default 20 should be sufficient in most systems. Tmo 0 means to use the default timeout.

--conn_tmo=nnn
The connect timeout specifies the time (in msec) to wait until an attempt to establish a connection is considered failed. The default 200 should be sufficient in most systems. Tmo 0 means to use the default timeout.

--live_tmo=nnn
The connection supervision timeout specifies the time (in msec) to wait until a connection is considered broken. Default is 100 (when the system is not idle) and should be sufficient in most systems. When the system is idle, the live timeout is ten times larger than the configured live timeout value. Tmo 0 means to use the default timeout.

--mtu=nnn
The MTU (Maximum Transmission Unit) specifies the size in bytes of the largets packet that the Ethernet protocol can pass onwards (this excludes the size of the Ethernet header). If not set the MTU is fetched from the interface. Typcially a MTU of 1500 bytes is used for Ethernet.

--attributes=s
The attribute option gives the possibility to assign an arbitrary string to the link when it is created. This string is included in the new_link signal, which is sent to all link supervisors. More information on link supervisors can be found in linx(7) man page.

Tcp Cm

The TCP CM is specified using the tcp keyword.

The create command takes the following parameters:

create <ip> <linkname> [OPTIONAL PARAMETERS]

ip
The IP address to connect to.

linkname
Name of the connection link. This is the LINX link part of the path in a remote hunt name to LINX endpoints on the other node. It will also be the name seen in /proc/net/linx/cm/tcp/<linkname>

Optional parameters

--live_tmo=<size>
The live_tmo parameter is the time in milliseconds between every heartbeat that is used to detect if the connection has gone down. The default value is 1000 ms.
--use_nagle=<bool>
Set to 1 if nagle algorithm shall be used on the socket for the connection. Default is off.
--attributes=<s>
The attribute option gives the possibility to assign an arbitrary string to the link when it is created. This string is included in the new_link signal, which is sent to all link supervisors.

Files

None.

Diagnostics

linxcfg will display more verbose information to standard out, if the -v option is specified.

Known Bugs

None.

Examples


linxcfg create 01:23:a4:4f:b3:ac eth0 link_A
linxcfg destroy link_A
linxcfg -t tcp create 192.168.1.1 link_A
linxcfg -t tcp destroy link_A

See Also

linx(7) , linxstat(1) , linxdisc(8)

Author

Enea LINX team

Copyright

Copyright (c) 2006-2007, Enea Software AB All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of Enea Software AB nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Table of Contents