Q. How do I find out if all host computers on the LAN are alive or dead from a Linux or Windows XP computer? My network subnet range is 192.168.1.0/24 and I'm using dual boot Debian Linux / XP SP2 computer.
A.You can use normal ping command and shell script loop statement to print the list of all LAN computers from a shell prompt.
Linux / UNIX one liner to ping all hosts on the LAN
Type the following command, enter:
$ for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip>/dev/null; [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ; done
Output:
192.168.1.1 UP 192.168.1.1 UP 192.168.1.2 UP 192.168.1.5 UP ...... ... .. 192.168.1.254 UP
See previous article: Simple Linux and UNIX system monitoring with ping command and scripts.
A Note About Windows Workstation
If you are using Windows 2000 / XP / Vista, try something as follows at DOS / NT command prompt (Start > Run > CMD > Enter key):
c:> for /L %I in (1,1,254) DO ping -w 30 -n1 192.168.1.%I | find "Reply"
Read cmd.exe help page and batch scripting documentation for more information.
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{ 14 comments… read them below or add one }
You would probably use
"for ip in $(perl -e '$,="\n"; print 0 .. 8;') ; do ping -c 1 192.168.1.$ip>/dev/null; [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ; done"on non GNU/Linux system, as seq does not exist on Solaris and OSX.
Ups, this is nicer, and faster.
for ip in $(perl -e '$,="\n"; print 1 .. 254;') ; do ping -t 1 -c 1 192.168.1.$ip>/dev/null; [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ; doneI’ve added a 1 sec. timeout on ping.
Do you know fping ?
$ sudo apt-get install fping
$ fping -a -g 192.168.1.0/24 2> /dev/null
@Casper,
Thanks for sharing perl only code.
@Richard,
Sure, fping was covered some time ago..
I generally just use this “ping -b 192.168.1.255″ Which broadcasts a ping to the whole network at once.
What about Windows machines with MS firewall which default forbid ICMP replay ?
Maybe must use ARP cache after ping
another way…
for ((ip=1;ip/dev/null; [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ; doneIf a host on your local network won’t answer on a ping request you could try arping, which does an arp request.
arping 192.168.1.1ARPING 192.168.1.1 from 192.168.1.226 eth0
Unicast reply from 192.168.1.1 [00:01:02:xx:xx:xx] 0.668ms
Another method is simply using nmap:
nmap -sP 192.168.1.0/24Something wrong with prev. comment… (< and > char)
for (( ip=1 ; ip<=254 ; ip++ )); do ping -c 1 -t 1 192.168.1.$ip>/dev/null; [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ; done
Using nast ?
http://netsecure.alcpress.com/nast/
nast -m
best.
another option is installing arpwatch.
wont this command do ???
nbtscan 10.0.0.1-125
this checks all the computers whose ip address are in the range of 10.0.0.1 to 10.0.0.125 and displays only those which are ON and connected to the network !
Matthias, thumbs up for the nmap solution.
Even faster (produces a little bit of confusing output in the beginning but it does the job fast):
for ip in $(perl -e '$,="\n"; print 1 .. 254;') ; do ping -t 1 -c 1 192.168.146.$ip > /dev/null && echo "192.168.146.$ip UP" >> hosts.log || : & sleep 0.02; done; sleep 1;cat hosts.log;rm hosts.log