topic Re: ndd parameters in Operating System - HP-UX

ndd parameters

William Pribble — Mon, 14 Oct 2002 14:18:43 GMT

I am running 11.0 on an N4000.
How do I list all the values of my ndd parameters?

Second part, is there any good documentation or resorces besides the ndd help on what these ndd parameters do and how to tune them?

thanks

Re: ndd parameters

Bernhard Mueller — Mon, 14 Oct 2002 14:26:16 GMT

Hello,

try:

ndd -h

then

ndd -get

HTH
Regards,
Bernhard

Re: ndd parameters

eran maor — Mon, 14 Oct 2002 14:33:29 GMT

Hi

i dont know a command that can give you all the vaule but you can use the command :
ndd -h to get all the params that ndd have and you can also write a smapp script that will take all hte info

Re: ndd parameters

John Dvorchak — Mon, 14 Oct 2002 14:33:48 GMT

To list all ndd parameters:

ndd -h

As far as what they do and how to tune them, I have always felt that if I don't know the acronyms, I shouldn't be messing with them. Nework tuning is best left to the networking gurus, because the defaults are very good only in rare extremem cases of a messed up LAN should they be tuned. And ususlly only with the help of a network sniffer and someone eminently qualified to decypher the results of the probe.

Re: ndd parameters

S.K. Chan — Mon, 14 Oct 2002 14:37:20 GMT

Apart from the man pages, there is little or perhaps not much documentation of ndd at all. If you were to tweak it just remmeber to make use of /etc/rc.config.d/nddconf to make 'em permanent.

Re: ndd parameters

eran maor — Mon, 14 Oct 2002 14:38:38 GMT

Hi Again

if you have a que about sepacial param you can ask over here and i will give you some guide lines about .

the command param htat every body change is :
tcp_keepalive_interval
Supported for 11.0
Supported for 11i

The parameter tcp_keepalive_interval determines the amount of time that TCP waits for an idle connection with no unacknowledged data before sending keepalive packets.

If the remote does not acknowledge the keepalive packet, TCP will use one of the following retransmission timers and terminate the connection when it elapses as follows:

Established connection tcp_ip_abort_interval
Connection establishment tcp_ip_abort_cinterval
Connection terminating tcp_keepalive_detached_interval

The timer itself restarts every time TCP sends or receives a packet.
So, when no activity is seen on the connection, the time will increase until the timer value reaches tcp_keepalive_interval.

When the timer values reaches tcp_keepalive_interval, KEEPALIVE 'probe' packet is sent to the other side and the other timer starts.
The 'probe' packet is retransmitted if no ACK comes. The retransmission happens in the same way as normal TCP data retransmission policy using exponential backoff algorithm. When the other timer's value reaches tcp_ip_abort_interval during the retransmission, the connection will be terminated silently

Re: ndd parameters

MANOJ SRIVASTAVA — Mon, 14 Oct 2002 14:43:13 GMT

Hi

good help is man ndd

you can go this site :

http://www.docs.hp.com/hpux/onlinedocs/B2355-90681/B2355-90681.html

Manoj Srivastava

Re: ndd parameters

Robert-Jan Goossens — Mon, 14 Oct 2002 14:47:20 GMT

hi

Why dont you use lanadmin

#lanscan
locate NMID number

#lanadmin -x

Kind regards,

RJ

Re: ndd parameters

rick jones — Tue, 15 Oct 2002 19:47:20 GMT

the advice about "if you don't understand it well, don't mess with it" is very good.

the tcp_keepalive_interval change for ndd would only affect those applications that have used setsockopt() to set SO_KEEPALIVE.

an unofficial resource for ndd settings can be found at:

ftp://ftp.cup.hp.com/dist/networking/briefs/

look for the annotated_ndd.txt file

Re: ndd parameters

Sridhar Bhaskarla — Tue, 15 Oct 2002 20:05:56 GMT

How do you list all your ndd parameters??.. Hmmmm.. write a script.

for PARAM in $(ndd -h |grep "_"|awk '{print $1}')
do
SUB=$(echo $PARAM|awk '{FS="_";print $1}')VALUE=$(ndd -get /dev/${SUB} $PARAM)
echo $SUB:$PARAM = $VALUE
done

-Sri

Re: ndd parameters

Sridhar Bhaskarla — Tue, 15 Oct 2002 20:09:06 GMT

The spaces got messed up.. Lemme try again

for PARAM in $(ndd -h |grep "_"|awk '{print $1}')
do
SUB=$(echo $PARAM|awk '{FS="_";print $1}')
VALUE=$(ndd -get /dev/${SUB} $PARAM)
echo $SUB:$PARAM = $VALUE
done

I wouldn't try to dump the output into a file.

-Sri