On 18-Jan-99 [EMAIL PROTECTED] wrote:
> I am connecting via ISDN to the net and under Windows, I can obtain both
> channels without any problems. However, when I try to connect with Linux,
> I can only get one channel. I have a 3com Impact IQ connecting via COM1
> and found that this is a great modem, but without the second channel, I am
> disappointed.
I've got one of those. The only trick for me was to make sure that I enabled
CHAP on the modem; S84=0; and you must not try and login via plain-text. If
you are using a plain-text login script it is already too late to MPPP
because the modem has switched into V.120 mode rather than async-sync PPP.
So, just set up your chap-secrets and try it.
at%r and at\s are good for looking at the modem configuration. Here is mine
in case it helps:
at%r
REG DEC HEX REG DEC HEX REG DEC HEX
S00 000 00H S63 009 09H S79 062 3eH
S50 003 03H S70 003 03H S80 000 00H
S55 071 47H S71 000 00H S82 005 05H
S56 070 46H S73 000 00H S84 000 00H
S57 001 01H S74 256 100H
S58 001 01H S75 000 00H
S59 001 01H S76 001 01H
S60 064 40H S77 060 3cH
S61 000 00H S78 061 3dH
at\s
IDLE 22:22:36
LAST DIAL n/a
PORT 1 ANI n/a
PORT 2 ANI 2268090
DATA ANI n/a
CAUSE CODE (000) Unspecified
SERIAL BPS 230400 AT$B230400
SERIAL FLOW H/W AT\Q3
DCD 1 AT&C1
DTR 2 AT&D2
DATA ECHO ON ATE1
RESULTS ON ATQ0
RESULT TYPE LONG ATV1
CONNECT MSG DTE ATW0
INACTIVE TIMER 0 AT\T0
COMPRESSION ON AT%C2
B-CHAN PROT QuickSelect
VOICE DBA IN/OUT
ML PPP Disabled
ML EPD CLASS 5
ML EPD ADDR 9042268090
L2 FRAME TYPE I-Frame
V.120 Frm Sz 256 Bytes
CALL WAITING Port 1
CONF CODE 60
TRANS CODE 61
DROP CODE 62
CALL STATUS Protocol: n/a, Rate: n/a
Don't mind the ML PPP disabled. I keep the NVRAM like that and then in my
chat script I do this; ATS80=0.
Here are the two files that I use to connect:
iag-isdn
--------
#!/bin/sh
MODEM=cua1
pppd asyncmap 0 noipdefault defaultroute /dev/$MODEM 38400 \
user chrisf remotename iag ipparam masq \
connect "chat -t 2 -f /usr/local/bin/iag-chat.isdn"
iag-chat.isdn
-------------
ABORT BUSY ABORT 'NO ANSWER' '' 'ATS80=0 D7566664' 'CONNECT 230400\r'
The 'ipparam masq' is an extra user-defined parameter that gets sent to my
ppp-up and ppp-down scripts so that I can tell whether to enable IP
Masquerading for that particular dial-out or dial-in.
Also notice the 38400 in the iag-isdn script. I have a hi-speed (StarTek
16650 chips) serial card and therefore I have replaced the 38400 baud rate
with proper values to achieve 230400 baud. I put this line in my
/etc/rc.d/rc.serial:
setserial /dev/cua0 spd_cust baud_base 460800 divisor 4
setserial /dev/cua1 spd_cust baud_base 460800 divisor 2
I wouldn't recommend the 16650 chips as they are not very compatible with my
kernel (2.0.27) in the way that it is not auto-detected and the compatibility
differences between 16650 and 16550 wind up setting the recieve threshold at
an innappropriate level (something like 24 chars in a 32 byte FIFO, rather
than 8 in a 16 byte FIFO). Therefore I get recieve over-runs if my machine
is busy. I /think/ that a 16750 would fix this but I am not sure.. or maybe
it is handled better in later kernels.
HTH.
/* Chris Faherty <[EMAIL PROTECTED]>, finger for PGP */
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