----- Original Message ----- From: "Andy Duplain" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, March 04, 2005 11:00 AM Subject: [speedtouch] Re: Invoking hotplug initialisation script once only
... > > > Finally I noticed yesterday the MTU of the interface (ppp0) was 32725!!! I have now set this to 1492, after looking about on the net, but do I need to set the MRU value, and is 1492 correct or should it be 1500? I know that this depends on ISP, and mine is Pipex in the UK. > > > > I think the thing about the MTU is that it shouldn't be bigger than some value > > (determined by the ISP), however it is OK to be smaller. Probably the value 1492 > > represents 1500-ppp_overhead. Anyway, you can always try it and see (you'll need > > to upload/download some big files to actually use packets of MTU size). With my > > previous ISP I was able to send and receive 64k packets perfectly fine... If you > > want to play that kind of game, you might also want to adjust the module parameters > > (you can see these using modinfo usbatm or modinfo speedtch depending on your kernel > > version). They allow you to do much larger data transfers to the modem if you want > > to (this is not the same as packet size - each transfer can contain several packets, > > or part of a packet). You can also tell it how many data transfers should be in > > flight at any one time. This kind of thing is only really useful if you use a large > > MTU. Most people won't care about this kind of thing, and as far as I know no-one > > actually uses any of it! But since I programmed it, I'm still hoping it might prove > > useful to someone... > > I'm using 2.6.11 and it's this: > > trojanfoe:~# modinfo speedtch > filename: /lib/modules/2.6.11/kernel/drivers/usb/atm/speedtch.ko > author: Johan Verrept, Duncan Sands <[EMAIL PROTECTED]> > description: Alcatel SpeedTouch USB driver version 1.8 > license: GPL > version: 1.8 > vermagic: 2.6.11 PENTIUMIII gcc-3.3 > depends: usb_atm > alias: usb:v06B9p4061dl*dh*dc*dsc*dp*ic*isc*ip* > srcversion: 22749B4497820BD7CEB96A0 > parm: sw_buffering:Enable software buffering (uint) > parm: dl_512_first:Read 512 bytes before sending firmware (bool) > > I will play with the params and MTU and see what works best. But what about MRU? > > Thanks for your swift and informative response! > I have tested with larger MTU because my ISP accept 32768 size (but not with speedtouch modem, with eagle-usb) I work most of the time but is not reliable if the site you connect to filter ICMP traffic and so don't handle fragmentation request. Liste de diffusion modem ALCATEL SpeedTouch USB Pour se d�sinscrire : mailto:[EMAIL PROTECTED]
