How to send out one PING in HP-UX only.

[Patrick_129]

Guys,

How to send one only one ping in HP-UX?

Thanks :)

patrickkuah

[Naveej.K.A · Accepted solution]

ping hostname/ipaddresss -n 1

this will send only one ICMP packet.

with best wishes
naveej

[A. Clay Stephenson]

All you need to do is man ping. The man page explains it fully.

ping remotehost -n 1

[Steven E. Protter]

ping hostname -n 1

You add a timeout of say 30 seconds with the -m 30 addition.

ping hostname -n 1 -m 30

tries one ping for 30 seconds before giving up.

ping hostname -n 1 -m 30
rc=$?

if [ $rc -ne 0 ]
then
echo "error, ping failed"
else
echo "ping worked"
fi

SEP

[Patrick_129]

Thank guys :) This is what i need. I need to ping the gateway just to maintain the arp table.

patrickkuah

[Patrick_129]

How about sending one ping with every interval of 30 sec ? I do not wish to flood the network. If possble, reduce the packet size to the smallest. My objective is to maintain my gateway arp entry.

[Naveej.K.A]

put the entry in cron to do it every 1 minute.

crontab -e
* * * * * /usr/sbin/ping hostname -n 1
save and exit

It will ping every minute one time

With best wishes
naveej

[KapilRaj]

man ping for PACKET_SIZE

Is it ping -s 1 ?? not sure but default is 56 bytes !

Kaps

[KapilRaj]

Also if your objective is to keep up an arp entry , It can be achieved by arp command ! just a thought note that ping is a broadcast ICMP !!

Kaps

[Trond Haugen]

Another option is to use a looping script:
while true
do
ping hostname -n 1
sleep 30
done &

You could start this from the command line, a rc script or inittab.

Regards,
Trond

[Sorrel G. Jakins]

I thought the arp table persisted, unless explicitly flushed?

[Patrick_129]

guys,

It ok, the problem was solved without writting the ping script.

Actually my senario is i have two load balancers which one is the primary and the other is the backup.
The problem is the failover portion, the mac address of the primary will change to the backup LB and after sometime, all my external client could not connect to the virtual ip anymore but for client in the same segment with the LBs are able to connect.

I found from a HP guy that there is a dead gateway detection feature which might caused this and i disabled it , It works!!! :)

Thank for the help :)