Thank you for your reply. To clarify further I am referring to the modem
settings on the win98 box. These are the Modem, Properties, Advanced
settings where there are two boxes, one for error control and one for
compression. If I put a check in these boxes and dial-into my linux box
using different ports I find the following:
1. Two of my three dial-in modems (all different makes)on my linux-box do
not make a connection. The modems keep squawking away and finally give up.
One of them has no problem.
2. When I remove error control and compression two out of three dial-in
modems work while the third puts garbage on the dial-up window.
3. When I use any of the three modems to dial-out of my linux box to my ISP
they all work perfectly.
In case 1. and 2. above I get "peer disabled compression" in
/var/log/messages. While in case 3 I get no such message. I have not
specified any compression options in my dial-in or dial-out
/etc/ppp/options files.
I am using mgetty for dial-in and I have read through a lot of the
documentation including that on the setserial command. Finally I came to
the linux compatible modem lists which show some modems dont work properly
with linux. Now my questions are:
1. If Linux ppp compression options do not apply to Win98 clients then how
does one use a modem with V.34 bis, V.42 bis and all the other bisses to
provide error control and compress the data so I can speed up my ppp
connection?.
2. Is it normal for modems to have different dial-out and dial-in
capability. I have read that some serial port adapters have this problem
but is it normal for modems also ?
3. Finally can some one recommend a good reliable cheap modem which will
gives them no problems with dial-in to a Linux box using data compression
from a Win98 box. My budget is around the $20-30 range. (The only one that
worked perfectly on dial-in and dial-out was the Best Data 336F which has
jumpers for COM ports and IRQ's but it is probably no longer available. I
dont need a 56K modem because the phone lines can't take it)
Thanks again for your help and advice,
Regards
Rajiv
------------------------------------------------
>> On Mon, 18 Oct 1999, Rajiv Ghai wrote:
>>
>> |Can anyone help me with working ppp compression settings to be used in the
>> |/etc/ppp/options file. I am dialing in to a RH6.0 linux box from a Win98
>> |client. The Win98 client has compression and error control enabled. Is
this
>> |sufficient for data compression or does one also need to specify
additional
>> |lines in the /etc/ppp/options file ?. I have read the pppd man page which
>> |gives all kinds of compression settings to be used but I wanted to know
>> |which of these, if any, of these are actually needed.
>>
>> Linux pppd and the MS PPP products have no common CCP -data compression-
>> algorithms in common. It's better to disable it in both rather than to
>> uselessly negotiate.
>>
>> I'm not sure what enabling "error control" means regarding PPP since a type
>> of CRC is a part of the PPP specification and don't use MS anymore.
>
>I believe MS provides options for VJ header compression and modem (not
>PPP) compression and error control protocols. As Clifford says, MS does
>not support the deflate or BSD data compression options.
>
>I believe leaving the compression/error control options enabled in Win9x
>is a good idea unless you have problems making a connection. You can use
>'noccp' in Linux pppd (v2.3.x) to disable deflate/BSD compression
>negotiation, but it is usually not necessary (see the pppd man page).
>
>Geof Goodrum
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