Date: Sun, 15 Jun 1997 17:48:40 +0200 (MET DST) From: Wolfgang Helbig <helbig@MX.BA-Stuttgart.De> To: wilko@yedi.iaf.nl (Wilko Bulte) Cc: FreeBSD-hackers@FreeBSD.ORG, rene@freeze.iaf.nl Subject: Re: ISDN troubles: it now works Message-ID: <199706151548.RAA29785@helbig.informatik.ba-stuttgart.de> In-Reply-To: <199706151214.OAA00995@yedi.iaf.nl> from Wilko Bulte at "Jun 15, 97 02:14:46 pm"
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> Hello
>
> We've finally gotten ISDN/PPP to work. There were multiple problems,
> including a typo in the kernel config file.
>
> But the best brain crusher was the fact that in isdnpppd the whole
> negotiation/setup stuff about local & remote IP addresses and the default
> route adding was commented out with #if 0's
>
> Which meant that after we finally got the dialling stuff working we
> saw a message telling us which addresses were assigned to local/remote
> ends of the connection. The ISP we have uses dynamic addresses.
> But isdnpppd never used these adresses to re-setup the link. Cute..
> The stupid thing is that all options related to handling dynamic
> adress setup are accepted like in the 'normal' pppd. But are simply
> ignored.
>
> I really don't understand why this is done, because after changing the
> #if 0 into #if 1 the protocols worked OK. That is, you need also a
> small hack in the kernel:
>
> /* FALLTHROUGH */
>
> case SIOCSIFFLAGS:
> x= splimp();
> if(!(ifr->ifr_flags & IFF_UP)) {
> if(sc->sc_outstate != STATE_IDLE){
> printf("bisdn: SIOCSIFFLAGS disco but fall
> thru\n");
> #if wilko
> isdn_disconnect(sc->sc_appl, 0);
> #endif
> }
> sc->ipp_ppp_sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
> sc->ipp_ppp_sc->sc_npmode[NP_IP]=NPMODE_ERROR;
> } else {
> sc->ipp_ppp_sc->sc_if.if_flags |= (IFF_UP|IFF_RUNNING);
> sc->ipp_ppp_sc->sc_npmode[NP_IP]=NPMODE_PASS;
> }
> splx(x);
> break;
>
> It looks like that if you want to use the address negotiation you need
> to patch the above in /sys/bisdn/b_isdnipp.c If you don't the connection
> is broken ('disco') on every attempt to dial. Dial is ok, and then
> during the re-setup with the assigned addresses (I guess..) the connection
> is dropped.
>
> Since I'm not an expert on this stuff I appreciate knowledgable insight/
> comments on why the #if 0 are there and why patch to the ioctl is needed.
Probably because the original patchers never believed that isdnpppd
would stay around that long. It was really meant to be a quick fix
to enable ppp functions in bisdn (for NetBSD). Since Dec 1st 1996
we happily received the first success message about a working
isdnpppd connection from Andrew Gordon. Soon after that we had the
dynamic addressing stuff working by reenabling the ifdef'ed code
and applying a patch similar to the one above.
On the ftp.muc.ditec.de server there are two tarballs--bisdntest
and bisdntest-2. They contain all kernel files and diffs to ease
bisdn(ppp) kernel modification in a -current environment. They
include among others the patch above. And a cute shell script from
Andreas Klemm to automate the kernel patches.
AFAIK bisdntest works well for FreeBSD 2.2.1 and bisdntest-2 is o.k
for FreeBSD 2.2.2. (You'll have to copy bisdn-ioctl.h and
bisdn-isdn.h to /sys/i386/include before starting mkbisdnkernel on
systems where there is no symlink from /usr/include/machine to
/sys/i386/include)
Some changes to bisdntest-2 where necessary to make it work on
-current. Those changes do not add any functionality to the code,
they only reflect modifications in some kernel interfaces. So I
hesitate to put a bisdntest-3 on the bisdn ftp server.
Glad to hear that bisdn works for you with PPP and dynamic IP adresses!
Wolfgang
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