PING without waiting for unreachable nodes

[Enrico Venturi]

Hello colleagues,
I want to check if a node is reachable;
we cannot use any other service but the "/etc/ping" because most of the services are unavailable (i.e. no telnet is allowed, .... ).

Is the "ping" able to check the reachability of the nodes with a fixed minimum timeout (e.g. 1 sec) in all the cases??
We use an algorithm so we don't want to wait too much when waiting for the node check.

regards
Enrico

[RAC_1 · Accepted solution]

Check -m option for ping. But the default is 10 sec.

Anil

[Steven E. Protter]

hostname=someserver.your.net
ping $hostname -n 1 -m 1
rc=$?

if [ $rc -eq 0 ]
then
echo "$hostname reached successfully..."
else
echo "$hostname not reached...."
fi

SEP

[Victor BERRIDGE]

Hi Enrico,
If I believe my BB config I would say no, that is BigBrother reports sometimes hosts:
[2221012] street.conn red Mon Jun 14 11:09:38 MET DST 2004 bb-network.sh: Can't ping street...

But If you ping the host you see its alive, that means BB pings once and if no reply it considers as not responding...

So I would say be causious on the fixed minimum ( not 1 sec...)


All the best
Victor

[BONNAFOUS Jean Marc]

Hi,

Use -c and -w options:

ping -c -w

example: ping -c 1 -w 1 servername, ping one request to servername and wait for a reply during one second maximum.

NB: -w option works only with -c options

Rgds
JMB

[Cole L.]

You may want to try fping. It is a utility that is designed to ping multiple hosts almost at the same time. It is very script friendly. Check out www.fping.com