ppp over serial with dial in functionality

[zix]

Hi Everybody,
I am supporting pppos for our target box. As we
have 1 single serial for console and pppos, so I am blocking getty in /
etc/inittab. Now, I have to support the dial in functionality. I think
for this support, we need to run agetty/mgetty. Can anybody give some
idea how to go about this? I am wondering if I run getty, can ppp over
serial run? I thing its possible, but now idea how to go about it. Any
help wil be great.

Thanks a lot for your time,
zix

[zix]

>>>sorry, not the entire dial in, we have to support only incoming call.

thanks,
zix

[Doug Mitton]

zix <zix...@gmail.com> wrote:

I use this regularly. I use mgetty and all the config is default
except for:

(Sorry about the line wrap.)

login.config:
/AutoPPP/ - - /usr/sbin/pppd nodefaultroute auth -chap +pap
192.168.10.1:192.168.10.253 ms-dns 192.168.10.1

* - - /bin/login @

You also have to have pap configured with id/passwords in
`pap-secrets` under "etc/ppp/".

I initiate it in `inittab` with:

T3:5:respawn:/sbin/mgetty -D -R 60 -n 2 -x 0 -p "@ Login:" -i
"/etc/issue.dial" -s 115200 -m '"" ATZM0 OK' ttyS2

This works well and reliably. I can:
- dial out
- dial in and login for a command prompt
- dial in and initiate a PPP connection

Just to keep out idle rif-raf I also use the "ringback" mode.

Good luck!
--
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[zix]

> I use this regularly.  I use mgetty and all the config is default
> except for:
>
> (Sorry about the line wrap.)
>
> login.config:
> /AutoPPP/ -    -   /usr/sbin/pppd nodefaultroute auth -chap +pap
> 192.168.10.1:192.168.10.253 ms-dns 192.168.10.1
>
> *       -       -       /bin/login @
>
> You also have to have pap configured with id/passwords in
> `pap-secrets` under "etc/ppp/".
>
> I initiate it in `inittab` with:
>
> T3:5:respawn:/sbin/mgetty -D -R 60 -n 2 -x 0 -p "@ Login:" -i
> "/etc/issue.dial" -s 115200 -m '"" ATZM0 OK' ttyS2
>
> This works well and reliably.  I can:
> - dial out
> - dial in and login for a command prompt
> - dial in and initiate a PPP connection
>
> Just to keep out idle rif-raf I also use the "ringback" mode.
>
> Good luck!
> --
> -------------------------------------------------
>        http://www3.sympatico.ca/dmitton
> SPAM Reduction: Remove ".invalid" from my domain.
> -------------------------------------------------

Hi, thanks for your response..well, some points are unclear to me. You
are respawning the mgetty over the only serial port, so how can pppos
for internet work over the same? I think ppp when runs needs the
exclusive access over serial, but if mgetty runs over the same
everytime, how do i run ppp over serial for internet?
lemem say it in a bit detail...
(1) First I get a call, so as mgetty is running it calls ppp and let
teh process continue...then I hangup, can i now run pppd client over
serial to connect my isp and connect to the internet?
(2) If (1) is possible, then the reverse is also possible. But can I
do that in middle? I mean can I receive any call while in the middle
of surfing? or start the internet connection while I am also connected
over the phone line?

Thanks and Regards,
zix
Please let me know a bit in detail....

[Doug Mitton]

zix <zix...@gmail.com> wrote:

Hmm, maybe I misunderstood your original question. Everything I
explained is for dial-in only. This process simply allows:
- dial-in shell
- dial-in ppp
from a single instance of mgetty. There is even a facility to ad FAX
to this but I'm just not using that.

>(1) First I get a call, so as mgetty is running it calls ppp and let
>teh process continue...then I hangup, can i now run pppd client over
>serial to connect my isp and connect to the internet?

There is a lot of detail in the mgetty man page and documents but
basically, when mgetty answers the phone with the parameters shown
above it listens to the connection and:
- if ppp "handshake" tones are received it spawns ppp
- if nothing is heard it spawns a login.

>(2) If (1) is possible, then the reverse is also possible. But can I
>do that in middle? I mean can I receive any call while in the middle
>of surfing? or start the internet connection while I am also connected
>over the phone line?

The serial (modem) phone line can only provide one function at a time.
It can:
- make calls (FAX or dialout ppp)
- receive calls (fax, shell or dial-in PPP)

In case I misunderstand, if you are using the local computer to surf
the internet via cable, DSL, wireless, etc (anything BUT dialup) then
the serial (modem) port is available for a remote computer to call in
and access either a shell or dialup-ppp and use your existing internet
connection.

>Thanks and Regards,
>zix
> Please let me know a bit in detail....

I use this setup to provide my own personal dial-up ISP if I am not at
home and want to connect to the internet. Not all ISP's especially
wireless or cable offer dialup access. Sometimes that is whats
convenient.