IP packet size

[Animesh Chakraborty]

Hi All,
How can I change the default IP packets size in hp-ux ?
In AIX it is tcp_mssdflt=512 and also is there any equivelent parameter in hp-ux to set send/receive buffer size?
In AIX it is
tcp_sendspace=16384
tcp_recvsize=16384

Thanks in Advance
Animesh

[Varghese Mathew]

Hi Animesh ,

Should be like this..

Use recive socket buffer size and send socket buffer size options along with rcp command to get better performance

ex.
rcp -R -S

where "-R" is for receive buffer sixe and "-S" is for sending buffer size.

Hope this helps

Cheers !!!
Mathew

[Sridhar Bhaskarla]

I don't think there is anyway we can change these settings on HP-UX. I am interested to know what command (not calls) you use in AIX to alter this behaviour globally?

In HP-UX, following are the equivalents for your AIX parameters.

tcp_mssdflt -> TCP-MSS = 536
IP-MSS= 576

For socket buffer send and receive sizes,

SO_SNDBUF = 4097
SO_RCVBUF = 4098

-Sri

[Animesh Chakraborty]

Hi Sridhar,
Frankly speaking I work only with hp-ux.
I will check with my AIX colleguae how do they change these paramater.
The equivalent parameter you mentaioned in hp-ux,how to find them out ?? I think they are not tunable kernel parameter.

Thanks
Animesh

[Animesh Chakraborty]

Hi sridhar,

In AIX they use the network options command

no -o tcp_mssdflt=XXXX i.e.

Anything in hp-ux?
Thanks
Animesh

[Sridhar Bhaskarla]

Animesh,

In HP, we use ndd command to tune most of the network related parameters. I don't remember seeing any of such parameters that are related to your send and receive buffer sizes.

I don't know if there are other unsupported parameters by HP with ndd command.

-Sri

[mostefai mourad]

hello,

I think you should try this:set up a route (just for testing between both hosts) with an MTU size of 512 (route -p 512 add host if both servers are
in the same subnet :

Example :
# route -p 512 add host 192.6.2.10 192.6.2.2

Mourad.

[harry d brown jr]

I think you need to take a close look at "lanadmin" to make your network changes.