BackupPC-users

[BackupPC-users] Alternative ping for computers with ICMP blocked

2010-06-28 18:27:43
Subject: [BackupPC-users] Alternative ping for computers with ICMP blocked
From: Eduardo Trápani <eduardo AT esperanto.org DOT uy>
To: backuppc-users AT lists.sourceforge DOT net
Date: Mon, 28 Jun 2010 19:05:53 -0300
Hi,

Just to share the alternative ping I'm successfully using with PCs running 
Windows XP that only have the ssh port open for cygwin sshd.  The server is 
running on Debian.

It tries to connect to port 22 (sshd) with netcat.  On connection it runs 
/bin/true and exits with 0.  If no connection is possible then it exists with 
code 1.

-w is the time you are willing to wait for a connection to be established.

Hope it helps other users.

Friendly, Eduardo.


#!/bin/bash

nc -w 2 -c /bin/true $1 22

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