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Viewing file:     pppbind.txt (5.88 KB)      -rw-r--r--

Date: Sat, 19 Oct 1996 02:21:45 +0200
X-Sender: sw0001@aixrs1.hrz.uni-essen.de To: isdn4linux@hub-wue.franken.de
From: Matthias Hessler <hessler@wi-inf.uni-essen.de> Subject: RE: options files
Sender: owner-isdn4linux@hub-wue.franken.de Reply-To: isdn4linux@hub-wue.franken.de

At 17:57 18.10.1996 +0200, you wrote:
>Matthias Hessler <hessler@wi-inf.uni-essen.de> ha escrito a
>isdn4linux@hub-wue.franken.de:
>
>> well, isdnctrl does not quite assign interface ipppx to /dev/ipppx by
>> default (e.g. interface ippp3 to /dev/ippp3). I'm not entirely sure how
>it
>> does its assignements, but I think it takes interface ipppx and binds it
>to
>> the first available /dev/ipppx, starting x with 0 and counting up (e.g.
>your
>> interface ippp3 gets bound to /dev/ippp0 because there is an ipppd
>already
>> waiting there)
>> Which leads to your problem: you want interface ippp3 _exclusively_ bound
>to
>> /dev/ippp3 because you want only your ipppd configured for /dev/ippp3
>> answering all the traffic from your interface ippp3.
>
>Hi Matthias
>
>Ok; for clarifying scripts (and my concepts :) I name net interfaces
>isdn0..isdn3, but when I try to launch ipppd, it tells me there must be at
>least ippp0 configured (???) Does it means i have to configure interfaces
>twice (one time for ipppX and other for isdnX)?

No.

Here is what happened: You named your net interfaces isdn0..isdn3 and did not use the pppbind option. Now isdnctrl has no clue that it should connect those interfaces to any /dev/ippp* .

If you name your net interfaces ippp0..ippp3, then isdnctrl _automatically_ recognizes (by the name of those interfaces) that those should be connected to the /dev/ippp* . It does it (if I'm not wrong about that default behavior) when data arrives by connecting a net interface to the first available /dev/ippp* .
Let's say if data arrives on net interface ippp3, it tries to connect it to /dev/ippp0, if that is available. If not (already another connection going on?), it tries /dev/ippp1, and so on.
As you have two ipppd's with different options running that is not what you want, because you can never tell in advance which data will be answered by which ipppd.

No matter how the name of your net interfaces is, if you use the "isdnctrl pppbind" option, you can tell isdnctrl to _always_ connect some netinterface with some /dev/ippp* . E.g.:
isdnctrl pppbind isdn3 2
tells isdnctrl to always put data from net interface isdn3 to /dev/ippp2.
That is very handy, if you want to have a special ipppd lurking on /dev/ippp2 that should get all that traffic from isdn3.

Isdnctrl acts like a switch board.

Default behaviour (using net interfaces ippp0 and ippp1): =========================================================

                  Kernel---------+
                    |            |
Net interface     ippp0        ippp1 (isdnctrl addif ippp*)
                    |            |
                    |            |
Isdnctrl         (by default, to next available device
                  => no isdnctrl pppbind necessary)
                    |            |
                    |            |
Device            /dev/ippp0 /dev/ippp1 /dev/ippp2 /dev/ippp3
                    |            |          |          |
                   ipppd       ipppd      ipppd      ipppd


Default behaviour (using net interfaces isdn0, isdn1, isdn2, isdn3): ====================================================================

                  Kernel------+----------+----------+
                    |         |          |          | Net interface     isdn0     isdn1      isdn2      isdn3 (isdnctrl addif ippp*)

isdnctrl          (no connection from isdn* to any /dev/ippp*,
                   because: name of net interface is not "ippp*")

Device            /dev/ippp0 /dev/ippp1 /dev/ippp2 /dev/ippp3
                    |            |          |          |
                   ipppd       ipppd      ipppd      ipppd



Behavior using "isdnctrl pppbind" (A):
======================================

                  Kernel------+----------+----------+
                    |         |          |          | Net interface     isdn0     isdn1      isdn2      isdn3 (isdnctrl addif isdn*)
                                                    |
                                                    | Isdnctrl                                    +-------+ (isdnctrl pppbind isdn3 2)
                                            |
                                            | Device            /dev/ippp0 /dev/ippp1 /dev/ippp2 /dev/ippp3
                    |            |          |          |
                   ipppd       ipppd      ipppd      ipppd


Behavior using "isdnctrl pppbind" (A):
======================================

                  Kernel------+----------+----------+
                    |         |          |          | Net interface     isdn0     isdn1      isdn2      isdn3 (isdnctrl addif isdn*)
                                         |
                                         | Isdnctrl                         +-------+ (isdnctrl pppbind isdn2 1)
                                 |
                                 |
Device            /dev/ippp0 /dev/ippp1 /dev/ippp2 /dev/ippp3
                    |            |          |          |
                   ipppd       ipppd      ipppd      ipppd


I hope that's correct. Please correct me if I'm wrong...

Bye,
Matthias

**************************************************************** Matthias HeЯler            Email: hessler@wi-inf.uni-essen.de Gelsenkirchener Str. 67    Tel. : 0201-8915964 45141 Essen                Fax. : 0201-8915965 ****************************************************************

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