How to set the refresh time of HP-UX socket buffer

[Bruno Ceotto]

HI all,

I?ve been reading some messages related to the "source quence received" problem. I have already increased my to buffer parameters to 256k:

- tcp_recv_hiwater_def
- tcp_xmit_hiwater_def

Reading the message:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,1150,0x7f086d96588ad4118fef0090279cd0f9,00.html
I understand that what is missing for me is the parameters that sets the time interbal to process the messages. I think now is 5 minutes (300000 ms) cause when I loop a ping command, the source quench message is raised from 5 to 5 minutes. ex:
00:00:00 - ping starts (ping -l 2000 -t)
00:00:30 - Source quench messages starts
00:05:00 - Source quench messages stops and ping became nomal again
00:05:30 - Source quench messages starts again and so on ...

[Peter Van Sant]

Bruno,

I don't know how to tell you to set a socket buffer refresh time, if that's even possible,
however I can tell you that the best solution
to unwanted source quench messages is to disable and forget them.

They are generated when rpcd, which has a socket open and bound to raw ip, receives to
many ICMP echo request messages before it reads its buffer every 5 minutes. Since it doesn't use or respond to them anyway your best solution is to disable the message.

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 /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.