[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Strange pppd behaviour in RH4.1 Linux



On Mon, 24 Mar 1997, Biener Ariel wrote:

> On Mon, 24 Mar 1997, Alexander Indenbaum wrote:
> 
> > On Sun, 23 Mar 1997, Biener Ariel wrote:
> > 
> > > On Sun, 23 Mar 1997, Alexander Indenbaum wrote:
> > > 
> > > > Hello!
> > > > 
> > > > I have strange problem with ppp. Transfer rate that
> > > > I get withLinux ppp is only 2.4 k/sec although
> > > > with Linux slip, Win95 ppp,FreeBSD ppp and with 
> > > > minicom I always get 3.5 k/sectransfer rate.
> > > > This transfer rates I get by downloading ~200k 
> > > > 
> > > > What might be the problem?
> > > > 
> > >Adapt the MTU size to your modem, I guess that 1024 will do.
> > > What I suggest you do is adding the following(cut & paste) into your
> > > /etc/ppp/options file:
> > > 
> > > asyncmap 0
> > > mtu 1024
> > 
> > Well I use mtu 1500 both for ppp and for slip, and this is the mtu 
> > of my ISP. And yet with the same mtu I get normal rate with CSLIP
> > and something terrible with PPP...
> > 
> > BTW what 'asyncmap 0' meens?
> 
> It defines a character map. If you read the PPP howto, you'll see that
> setting an MTU of1500 is unwise, to say the least. There is no MTU of
> your ISP, the MTU fits to the lowest setting. Set it to 1024, and the
> asyncmap to 0, and at least try it. If you ask for help, and help is
> offered to you, you can at least try it out before ruling it out.
> 

First of all I have to say that I really apprciate the 
help that I'm getting here and I'm not being cinic nor 
snobic ( snobic I'll be later ) :{)

Yet, I must say that I use Linux for a long time and 
and in same time I'm working in ISP and have a *LOT*
of expiriance with SLIP/PPP, Unix. This meens that I
read PPP-Howto in several editions for several platforms
and know adantanges and disadvantages of setting MTU
to be 1500 still find it the right thing to do. 

Although I'm such an expert and smart guy :{) I can 
not see  the reason why my ppp's connection speed 
is only 19200.

- it is not a modem hardware problem
- my modem claims that it connects 38400
- it is not an init string problem
- it is not an ISP problem 
- I get 3.6K rate with ppp in Win95/FreeBSD
  and Linux slip on the same PC

I think that it is probably pppd problem but what is it?
I even added 38400 line to my /etc/ppp/options to force
fast speed to my pppd still no results.

 
Thank you for your help,

  Alexander Indenbaum
  baum@actcom.co.il


> Regards,
> 
> --Ariel
> 
> > 
> > > 
> > > Check how it improves your transfer rate..
> > > 
> > > --Ariel
> > > 
> > > >   Alexander Indenbaum
> > > >   baum@actcom.co.il
> > > > 
> > > > 
> > > 
> > >  +---------------------------------------------------------+
> > >  | Ariel Biener                                            |
> > >  | e-mail: ariel@post.tau.ac.il        Work ph: 03-6406086 |
> > >  +---------------------------------------------------------+
> > > 
> > 
> >   Alexander Indenbaum
> >   baum@actcom.co.il
> > 
> > 
> 
>  +---------------------------------------------------------+
>  | Ariel Biener                                            |
>  | e-mail: ariel@post.tau.ac.il        Work ph: 03-6406086 |
>  +---------------------------------------------------------+
> 



Follow-Ups: References: