On Sat, 26 May 2001, krishna wrote:
> i have got a winmodem(PCTel) but the drivers have been installed alright from
> linmodems.i am able to connect to the net but rate of transfer is very very
> slow at times arnd 1 kbps!!.i read that playing arnd with MRU and MTU values
MTU is what you send to your isp. So if its too large they might choke on
it.
MRU is what isp sends to you, let it be the default 1500, because your
machine shouldnt choke on that.
About the right MTU value, RFC says everyone on the net should support
atleast 576. Yours could be higher. Keep 20 bytes for the ip header and
add how many bytes you would want to send with. 660 works fine for me.
I had a script which starts of with 1500 and plots the through put for
different packet size, by pinging the gateway ( ppp peer ). Since it
depends on the fluctuating load on the gateway, the curve is not very
ideal, ( one has to truncate the suspicious peaks ). But one can get a
fair idea what should the value be around.
-- sreangsu
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