topic Re: Source Quench received when pinging server from PCs in Operating System - HP-UX

Source Quench received when pinging server from PCs

Greg Hale — Tue, 30 Jan 2001 13:54:21 GMT

I've recently noticed the following response when pinging our HP 9000/800/N4000-36 server:

Reply from : Source Quench Received

Other times we get the typical response:

Reply from : bytes = time = TTL =

Ping this server from one of our other HP-UX servers also results in the typical reply I would expect to see.

So the Source Quench Received only seems to happen when we ping the server from a PC. But it doesn't happen on every ping.

What does Source Quench Received mean? Any help would be appreciated.

thanks,

Greg

Re: Source Quench received when pinging server from PCs

Rita C Workman — Tue, 30 Jan 2001 14:05:44 GMT

Here's a thread that answers your question and gives you a method of getting rid of the messages....they are annoying is all:

http://us-support.external.hp.com/cki/bin/doc.pl/sid=704926cf1c898b30b4/screen=ckiDisplayDocument?docId=200000046590817

/rcw

Re: Source Quench received when pinging server from PCs

James R. Ferguson — Tue, 30 Jan 2001 14:07:10 GMT

Greg:

Document #S3100005739 states, in part:

PROBLEM: Upon pinging an 11.0 system, I am seeing a packet loss and Internet Control Message Protocol (ICMP) source quench messages.

RESOLUTION

ICMP source quench messages are generated when an IP packet is received by the 11.0 system that can't be delivered to the socket buffer of the receiving application. The intent is to inform the sender of the full buffer condition so the rate of the transmission
is slowed down until the buffer can be read by the receiving application.

Setting the ndd parameter ip_send_source_quench to 0 can be an effective way to deal with the messages. Programs that use icmp protocol, such as ping, use a type of
socket called SOCK_RAW. The nature of using raw IP sockets is that ALL packets received that match the protocol type of the raw socket are delivered to ALL the sockets using that protocol. It is up to the application to read all the data in it's socket buffer and discard the data it's not interested in. If any of these sockets are full, the icmp source quench message will be generated.

...JRF...

Re: Source Quench received when pinging server from PCs

Andreas Voss — Tue, 30 Jan 2001 14:12:18 GMT

Hi,

have a look at this thread

http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x28d0f841489fd4118fef0090279cd0f9,00.html

Regards

Re: Source Quench received when pinging server from PCs

Greg Hale — Wed, 31 Jan 2001 15:59:15 GMT

I followed the notes in Knowledge Base entry KBRC00000238 that says to modify /etc/rc.config.d/nddconf. I followed the steps and still get Source Quench Received when I ping the server from a Win 98 PC or a Win NT 4.0 PC.

Any additional ideas?

Re: Source Quench received when pinging server from PCs

Greg Hale — Mon, 05 Feb 2001 12:53:41 GMT

We rebooted the server and the changes that were made per the previous replies seems to have taken effect as we now no longer receive the Source Quench message when pining the server.

thanks,

Greg