tcp/ip parameter

[Gabriele FACCHINI]

Hi all i find a tcp/ip parameter in hp-UX 11.00 or 11i like sun solaris "udp_max_buf" [Controls how large send and receive buffers (in bytes) can be for a UDP socket].

Thanks a lot.
Gabriele

[Stefan Farrelly]

socket_udp_rcvbuf_default - Sets the default receive buffer size
socket_udp_sndbuf_default - Sets the default send buffer size

You can see all the tcp settings with;
ndd -h supported
or
ndd -h unsupported

[RAC_1]

socket_udp_rcvbuf_default
socket_udp_sndbuf_default

Also check ndd -h supported and
ndd -h unsupported

[Gabriele FACCHINI]

Hi, thanks for replay.
How can i see the value of this parameters?

thanks
Gabriele

[sparky_2]

Hi,
Try "ndd -get "

[Stefan Farrelly]

ndd -h socket_udp_rcvbuf_default

Shows its current value. Use -set to set it. See man ndd. To make it permanent you need to add it into /etc/rc.config.d/nddconf

[Fabio Ettore]

Hi Gabriele,

# ndd -get /dev/udp socket_udp_rcvbuf_default

should help you.

Best regards,
Ettore

[Fabio Ettore]

...and how to set it to a new value:

# ndd -set /dev/udp socket_udp_rcvbuf_default

Best regards,
Ettore

[Gabriele FACCHINI]

Hi Stefan how can i modify the value of these parameters?
I try with these command with no results:
ndd -set /dev/udp socket_udp_rcvbuf_default
ndd -set /dev/tcp socket_udp_rcvbuf_default
ndd -set /dev/arp socket_udp_rcvbuf_default
ndd -set /dev/ip socket_udp_rcvbuf_default
thanks
Gabriele

[Fabio Ettore]

this parameter is about udp protocol...

# ndd -get /dev/udp socket_udp_rcvbuf_default

to get and

# ndd -set /dev/udp socket_udp_rcvbuf_default 131060

131060 is an example, anyway it is a numeric value.
Otherwise useful would be to know what message gets 'ndd -set /dev/udp socket_udp_rcvbuf_default ' that you are trying...

Best regards,
Ettore

[Gabriele FACCHINI]

Hi Mr Rossi, you try to execute this command on a server and you verify if it works.

By
Gabriele

[Stefan Farrelly · Accepted solution]

Use;

ndd -set sockets socket_udp_rcvbuf_default

That works for me.

[Stefan Farrelly]

The sockets arg (instead of /dev/tcp or /dev/udp etc.) doesnt list on my manpage for ndd but it is valid. It doesnt seem to work in /etc/rc.config.d/nddconf is you set TRANSPORT to sockets (instead of tcp/udp etc.) so you must do it manually after reboot or create your own system startup job to set it on reboot.

[Fabio Ettore]

Mr Facchini,
If

# ndd -set /dev/udp socket_udp_rcvbuf_default

doesn't obtain any output, it means that it worked! You can verify it in this way:

# ndd -set /dev/udp socket_udp_rcvbuf_default
and immediately launch
# echo $?

If it returns 0 means that it worked.
Otherwise that I asked you is about what output you obtain when you launch that command.

Anyway Stefan suggested you another command, does it work?

Best regards,
Ettore