source quench while pinging in 11.x

[Amruth]

Hi,

We have a two node cluster with and L-class and a D-class both are with HP-UX 11.00

The problem is that when you do a ping from any PCs it give the error " SOURCE QUENCH RECEIVED "

Can anybody help me to solve this.

Thanks in advance,
arjun

[Steven Sim Kok Leong]

Hi,

The source quench benefits both the pinging client and the ping'ed server because it is the feedback by the server to client that it is receiving packets too fast, thus asking the client to slow down.

To disable it anyway (so that you don't see such messages), on the server, execute the following:

# ndd -set /dev/ip ip_send_source_quench 0

Hope this helps. Regards.

Steven Sim Kok Leong
Brainbench MVP for Unix Admin
http://www.brainbench.com

[Sanjay_6]

Hi Arjun,

Try this link below,

http://us-support.external.hp.com/cki/bin/doc.pl/sid=ea7d7d391bf6710eb9/screen=ckiDisplayDocument?docId=200000049809940

Hope this helps.

Regds

[Deshpande Prashant]

Hi
Use the command "ndd" to disable the source quench messages.

#ndd -set /dev/ip ip_send_source_quench 0

Thanks.
Prashant Deshpande.

[Charles Harris]

Hi,

I had exactly the same problem with a few of our new HPUX11 servers. It seems to me that the default TCP / IP parameters are a bit mean to say the least. Although one post suggests disabling source_quench errors, I would recommend looking through your TCP / IP configuration and making a few ammendments. It should also be noted however that optimal settings should be based around what applications are running on your servers. If they are web based, your web server provider help page will usually shed some light.

I query all parameters as follows:

ndd -get /dev/tcp ? >> /tmp/options.out
for i in `pg /tmp/options.out |grep -v status |awk '{print $1}'`
do
echo $i \\c >> /tmp/current
ndd -get /dev/tcp $i >> /tmp/current
done

This *should* provide you with all the values for your current setup (TCP only) and should allow you to check them agains recommended settings.

A simple bodge of the above will also let you make changes dynamically, but remember to update your config files to make it perm. (/etc/rc.config.d/nddconf
)
ndd -c will load the nddconf files on the fly also, instead of changing the above.

Hope this is of some use!!!

-ChaZ-

[Samboja · Accepted solution]

Hi,

You can disable source quench in HP-UX 11.0 by executing this command:

ndd -set /dev/ip ip_send_source_quench 0

To disable Source Quench so that it can survive a reboot, modify the /etc/rc.config.d/nddconf file as follows :

TRANSPORT_NAME[X]=ip
NDD_NAME[X]=ip_send_source_quench
NDD_VALUE[X]=0

Where X is the next logical numerical sequence in a table of values, with X starting at 0.

hope this can help you.

regards,

Boja