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Top Forums Shell Programming and Scripting Send/receive file through serial using minicom Post 302912850 by achenle on Tuesday 12th of August 2014 07:52:45 AM
Old 08-12-2014
OK, this doesn't directly answer your question, but why ping test any network connection before trying to use it? That's like checking a car for a trailer hitch before taking it to pick up a gallon of milk at 7-11 - it's completely irrelevant to what you're trying to do. Sure, a positive result tells you the car is there, but it doesn't tell you the car works. And a negative result tells you only that there's no trailer hitch - the car could still be there working just fine to boot.

Networks can be and are configured to block explorations such as pings. Hosts can be and are configured to not respond to pings. Networks can also and often are configured to block SSH or FTP sessions, so even if a ping is successful that's not proof an SSH session will connect.

If you're going to use a network-based service, just use the damn thing. A successful ping prior to trying such a service doesn't mean the service works, and a failed ping doesn't mean it won't.
 

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SETETHER(8)						      System Manager's Manual						       SETETHER(8)

NAME
setether - Set the ethernet address for use with DECnet SYNOPSIS
setether <if> [<if>...]|all [options] DESCRIPTION
Set ethernet MAC address on ethernet adaptors This script should be run at system startup. It will change the ethernet hardware (MAC) address of any or all ethernet interfaces to match the DECnet node address. DECnet requires that the MAC address of all ethernet adaptors running the protocol be set approriately. If you do not run setether then you must change the ethernet address in some other way for DECnet to work. By default no ethernet interfaces will have their MAC addresses changed by setether, if you specify all then all interfaces name eth* will be changed, otherwise a list of interface names can be specified. setether will enable (UP) all interfaces it changes the MAC addresses of. (2.4 only) The first interface specified on the command-line will also be made the default interface for DECnet operations (ie attempts to contact nodes not in the neighbour table will be done over this interface). This script must be run with the interface inactive, it is normally run from /etc/init.d/decnet before TCP/IP starts up. EXAMPLES
set the MAC address of eth0. # /sbin/setether eth0 set the MAC address of all ethernet interfaces # /sbin/setether all HELPFUL HINTS
If you have multiple ethernet cards on your system and they are connected to the the same network you should specify which one you want to use for DECnet communication on the setether command line, otherwise they will both be given the same MAC address and this is probably not what you want. Running DECnet on multiple ethernet interfaces only works under Linux 2.4. If you are running Linux 2.2 then the interface name on the setether command line must match the one in /etc/decnet.conf(5). SEE ALSO
decnet.conf(5), dntype(1), dndir(1), dndel(1), dnetd(8), dnping(1) DECnet utilities March 01 2001 SETETHER(8)
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