Date: Mon, 03 Sep 2001 21:11:27 +0100 From: Brian Somers <brian@Awfulhak.org> To: Shunsuke SHINOMIYA <s-shino@kt.rim.or.jp> Cc: freebsd-bugs@freebsd.org, freebsd-stable@freebsd.org, re@freebsd.org, snap-users@kame.net Subject: Re: user-ppp assigns the address same with already assigned for other clients Message-ID: <200109032011.f83KBRj24419@hak.lan.Awfulhak.org> In-Reply-To: Message from Shunsuke SHINOMIYA <s-shino@kt.rim.or.jp> of "Sun, 02 Sep 2001 22:18:25 %2B0900." <20010902213719.968A.S-SHINO@kt.rim.or.jp>
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I've cc'd snap-users@kame.net in case someone can come up with a
quick fix (FreeBSD is about to be released, and this bug has just
been exposed)....
> Dear sir,
>
> I noticed while building the PPTP server with FreeBSD 4.4-RC, user-ppp
> seems that it assigns already assigned address for other clients.
>
> It checked by 4.4-RC-20010825-JPSNAP.
>
> For example, pptpd(PoPToP) running with user-ppp(ppp.conf contains the
> following), and one client has already connected. Other client make
> connections and user-ppp assigns the same address of already connected
> by high probability, and it becomes impossible communicate normally.
>
> > set log Phase IPCP
> >
> > set ifaddr 192.168.1.1 192.168.1.64-192.168.1.65 255.255.255.255
> > accept dns
> > set dns 192.168.1.1
> > set timeout 0
> >
> > disable PAP CHAP MSCHAP
> > enable MSCHAPv2
> > disable deflate pred1
> > deny deflate pred1
> >
> > set mppe 128 stateless
> > enable mppe
This is very bad. This will break most ppp server setups that
allocate IP numbers on demand.
Taking a quick look, I can only *guess* that this has been caused by
one of the recent kame MFCs, as the SIOCAIFADDR ioctl() (that ppp uses
to assign the addresses, and expects to fail for duplicates) is now
implemented in the kernel by using SIOCAIFADDR_IN6 (the ipv6-capable
implementation).
I'll try to get a chance to look at it in the next day or two.
For anyone that may be able to help, I've attached a couple of ppp
config entries. Running ``ppp loop'' and typing ``open'' in two
different screens will show the problem -- four interfaces are
configured, two pairs of duplicates.
> Thanks.
>
>
> / Shunsuke Shinomiya /
> /s-shino@kt.rim.or.jp/
Cheers.
--
Brian <brian@freebsd-services.com> <brian@Awfulhak.org>
http://www.freebsd-services.com/ <brian@[uk.]FreeBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@[uk.]OpenBSD.org>
loop:
set timeout 0
set device "!ppp -direct loop-in"
set dial
set login
set log
set ifaddr 10.2.0.1/24 10.1.0.1-10.1.0.2
loop-in:
set timeout 0
set log
set ifaddr 10.1.0.1/24 10.2.0.1-10.2.0.2
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