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Full Discussion: How to extract NIC and other info ,given Ip
Special Forums IP Networking How to extract NIC and other info ,given Ip Post 302229306 by buffoonix on Tuesday 26th of August 2008 05:39:51 PM
Old 08-26-2008
Executing commands remotely via SSH isn't that much different from doing the same via rsh/remsh, except for the lack of the cryptographic tunnel, so to speak.
Usually one would create a pair of RSA keys by ssh's ssh-keygen command,
then distribute it to all remote hosts where one wishes to remotely execute the commands.
On the host from where you schedule your checks create a key pair.
Log in as a non-root user.
If in your $HOME there is no subdir .ssh present then it would be the easiest way to create the necessary structure by connecting to any remote SSH server. This doesn't have to be a real login. You would only confirm with yes when you are asked by your ssh client if it should add the new host key from the remote host. Then interrupt by pressing ^C.
This only serves the purpose to have the .ssh subdir and known_hosts file in it automatically created with the correct ownership and permission bits by your SSH client
because per default any SSH server runs with StrictModes enabled and thus is very picky about correct perms.
So run $ ssh some_host, confirm with yes, and abort when being asked for a password.
Now you can create your RSA key pair by issuing
Code:
 $ ssh-keygen -t rsa -b 1024 -N "" -f ~/.ssh/id_rsa

Note, that I above explicitly provided the new private RSA key with an empty passphrase
which basically is from the security standpoint a pretty poor choice.
A better solution would be to omit the -N switch and enter a passphrase,
then start the ssh-agent and ssh-add your key.
But this would at least once require interactive user input.
Now you need to distribute your new public RSA key to any remote host where you want to run commands on.
This requires that you can login there (i.e. know some user/passwd),
and that this user also already has a correctly set up $HOME/.ssh directory.
If this is the case you can next scp the key in the proper place by issuing
Code:
$ ssh remuser@remhost 'cat >>.ssh/authorized_keys' < ~/.ssh/id_rsa.pub

If all went well you are now ready to run commands remotely that you could schedule by cron.
e.g.
Code:
$ ssh -i ~/.ssh/id_rsa -l remuser remhost /usr/sbin/ifconfig -a

or any other command that remuser has permissions to execute on remhost.
You can pipe its output into grep locally (just append "| grep whatever"),
or do the parsing also remotely.
In that case you need to quote the pipe by prepending a backslash
(in fact any meta character that your local shell would otherwise interpret).
 

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LEARN ABOUT NETBSD

eshconfig

ESHCONFIG(8)						    BSD System Manager's Manual 					      ESHCONFIG(8)

NAME

     eshconfig -- configure Essential Communications' HIPPI network interface

SYNOPSIS

     eshconfig [-estx] [-b bytes] [-c bytes] [-d filename] [-i usecs] [-m bytes] [-r bytes] [-u filename] [-w bytes] [interface]

DESCRIPTION

     eshconfig is used to configure device-specific parameters and download new firmware to the Essential Communications RoadRunner-based HIPPI
     network interface.  The interface is very sensitive to the DMA performance characteristics of the host, and so requires careful tuning to
     achieve reasonable performance.  In addition, firmware is likely to change frequently, which necessitates a reasonably easy way to update
     that firmware.

     Available operands for eshconfig:

     -b bytes
	     Adjust the burst size for read (by NIC of host memory) DMA.

     -c bytes
	     Adjust the burst size for write (by NIC of host memory) DMA.

     -d filename
	     Filename for file to download into NIC firmware.  This must be a file in the standard Essential format, with :04 preceding every
	     line, and a tag line at the end indicating the characteristics of the firmware file.

     -e      Write data to EEPROM.  Normally, setting tuning parameters will only persist until the system is rebooted.  Setting this parameter
	     ensures that the changes will be written to EEPROM.

     -i usecs
	     Interrupt delay in microseconds.

     -m bytes
	     Minimum number of bytes to DMA in one direction (read or write) before allowing a DMA in the other direction.  Tuning this prevents
	     one direction from dominating the flow of bytes, and artificially throttling the NIC.

     -r bytes
	     Bytes before DMA starts for read (from host to NIC).  This controls how soon the DMA is triggered;  until this many bytes are
	     requested, the DMA will not begin.

     -s      Show statistics for the HIPPI NIC.  Repeat the option to suppress non-zero statistics.

     -t      Show current tuning parameters on the host.

     -u filename
	     Name of file to which the NIC firmware should be uploaded.  Not currently supported.

     -w bytes
	     Number of bytes required before write (from NIC to host) DMA is started.  Until this many bytes are ready to be written, the DMA will
	     not start.

     -x      Reset the NIC.  This is necessary for the HIPPI-FP support, as ifconfig(8) will no longer physically reset the NIC when the inter-
	     faces goes up and down.

     Only the super-user may modify the configuration of a network interface.

DIAGNOSTICS

     Messages indicating the specified interface does not exist or the user is not privileged and tried to alter an interface's configuration.

SEE ALSO

     esh(4), ifconfig(8)

HISTORY

     The eshconfig command first appeared in NetBSD 1.4.

BSD
								   June 17, 2005							       BSD
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