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John Horne | 3 Jul 2006 16:29
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Multiple unsupported protocol errors

Hello,

I have built an FC5 server with poptop 1.3.2. The kernel (2.6.17) and
PPP (2.4.3) are as supplied with FC5.

We can connect to the server with no problem using desktop PC's.
However, when a colleague tries to connect using a PDA, the debugging
output shows lots of 'unsupported protocol' errors:

===============================================================
Jul  3 12:53:21 betty pppd[12911]: local  IP address 192.168.196.64
Jul  3 12:53:21 betty pppd[12911]: remote IP address 141.163.196.64
Jul  3 12:53:21 betty pptpd[12910]: GRE: accepting packet #14
Jul  3 12:53:21 betty pppd[12911]: Script /etc/ppp/ip-up started (pid
12944)
Jul  3 12:53:21 betty pppd[12911]: rcvd [proto=0x7] bd b3 fa bc b0 4c 6c
a9 2d b2 66 12 96 48 7d ac a6 b4 62 95 c6 5e 69 08 bf 25 69 ca 78 c8 09
8f ...
Jul  3 12:53:21 betty pppd[12911]: Unsupported protocol 0x7 received
Jul  3 12:53:21 betty pppd[12911]: sent [LCP ProtRej id=0x3 00 07 bd b3
fa bc b0 4c 6c a9 2d b2 66 12 96 48 7d ac a6 b4 62 95 c6 5e 69 08 bf 25
69 ca 78 c8 ...]
Jul  3 12:53:21 betty pppd[12911]: Script /etc/ppp/ip-up finished (pid
12944), status =0x0
Jul  3 12:53:22 betty pptpd[12910]: GRE: accepting packet #15
Jul  3 12:53:22 betty pppd[12911]: rcvd [proto=0xc1] 1d 80 5e 33 fc bc
e5 99 5a 60 aa 7c 1a e6 c6 71 6e 21 ee ae 9d 06 55 60 f1 b1 45 59 31 3c
4d 7b ...
Jul  3 12:53:22 betty pppd[12911]: Unsupported protocol 0xc1 received
Jul  3 12:53:22 betty pppd[12911]: sent [LCP ProtRej id=0x4 00 c1 1d 80
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James Cameron | 4 Jul 2006 01:04
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Re: Multiple unsupported protocol errors

We've seen multiple reports of PDAs that assume MPPC is available
regardless of how they are asked to operate.  Try an alternate MPPE or
MPPC implementation.

--

-- 
James Cameron                         http://quozl.netrek.org/
HP Open Source, Volunteer             http://opensource.hp.com/
PPTP Client Project, Release Engineer http://pptpclient.sourceforge.net/

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John Horne | 4 Jul 2006 11:30
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Re: Multiple unsupported protocol errors

On Tue, 2006-07-04 at 09:04 +1000, James Cameron wrote:
> We've seen multiple reports of PDAs that assume MPPC is available
> regardless of how they are asked to operate.  Try an alternate MPPE or
> MPPC implementation.
> 
Hello,

Oh rats. I was hoping that the PDA was being honest when it said it had
negotiated not to use compression. The kernel has the built-in MPPE, but
no MPPC. As far as I can tell Jan Dubiec's patches only go up to the
2.6.13 kernel. FC5 runs (currently) with a 2.6.17 kernel, so either we
need to drop back the kernel level, which may affect other things, or we
need to modify the existing mppe to support mppc based on Jan's patches.
Looks like possibly a fair bit of work.

John.

--

-- 
---------------------------------------------------------------
John Horne, University of Plymouth, UK  Tel: +44 (0)1752 233914
E-mail: John.Horne <at> plymouth.ac.uk       Fax: +44 (0)1752 233839

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Seferovic Edvin | 4 Jul 2006 11:37
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Re: Multiple unsupported protocol errors

Isnt the mppe-mppc already in the kernel ( since 2.6.16 or so ) ???
PPP MPPE compression ( encryption ) ??

Regards,

Edvin 

-----Original Message-----
From: poptop-server-bounces <at> lists.sourceforge.net
[mailto:poptop-server-bounces <at> lists.sourceforge.net] On Behalf Of John Horne
Sent: Dienstag, 04. Juli 2006 11:31
To: poptop-server <at> lists.sourceforge.net
Subject: Re: [Poptop-server] Multiple unsupported protocol errors

On Tue, 2006-07-04 at 09:04 +1000, James Cameron wrote:
> We've seen multiple reports of PDAs that assume MPPC is available
> regardless of how they are asked to operate.  Try an alternate MPPE or
> MPPC implementation.
> 
Hello,

Oh rats. I was hoping that the PDA was being honest when it said it had
negotiated not to use compression. The kernel has the built-in MPPE, but
no MPPC. As far as I can tell Jan Dubiec's patches only go up to the
2.6.13 kernel. FC5 runs (currently) with a 2.6.17 kernel, so either we
need to drop back the kernel level, which may affect other things, or we
need to modify the existing mppe to support mppc based on Jan's patches.
Looks like possibly a fair bit of work.

John.
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Phil Mayers | 4 Jul 2006 11:49
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Re: Multiple unsupported protocol errors

Seferovic Edvin wrote:
> Isnt the mppe-mppc already in the kernel ( since 2.6.16 or so ) ???
> PPP MPPE compression ( encryption ) ??

No. MPPC is patented. You are thinking of the recently-added in-kernel 
MPPE without MPPC.

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Seferovic Edvin | 4 Jul 2006 11:52
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Re: Multiple unsupported protocol errors

>No. MPPC is patented. You are thinking of the recently-added in-kernel 
>MPPE without MPPC.

I knew about patent, but why do they call it "MPPE compression" in kernel?
This is very misleading name. Maybe they should just call it MPPE !

Regards,

Edvin Seferovic

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Phil Mayers | 4 Jul 2006 11:55
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Re: Multiple unsupported protocol errors

Seferovic Edvin wrote:
>> No. MPPC is patented. You are thinking of the recently-added in-kernel 
>> MPPE without MPPC.
> 
> I knew about patent, but why do they call it "MPPE compression" in kernel?
> This is very misleading name. Maybe they should just call it MPPE !

PPP has a generic layer for compression. MPPE *is* actually a PPP-layer 
"compression" type, that does not compress. It encrypts (and actually 
makes things larger by 4 bytes). MPPC is a capability bit on the MPPE 
encryption. Blame Microsoft for their standard hackery.

I believe the reasoning behind this is that MPPE predates the PPP 
encryption layer, but I could be wrong.

Possibly you're right that it's not helpful naming.

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James Cameron | 5 Jul 2006 01:11
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Re: Multiple unsupported protocol errors

On Tue, Jul 04, 2006 at 10:30:39AM +0100, John Horne wrote:
> As far as I can tell Jan Dubiec's patches only go up to the 2.6.13
> kernel. FC5 runs (currently) with a 2.6.17 kernel, so either we need
> to drop back the kernel level, which may affect other things, or we
> need to modify the existing mppe to support mppc based on Jan's
> patches.

You're right, either drop back or port Jan's work to current kernel.org
versions.  It's not something I can be involved in due to the MPPC
patent issue, and I'm fairly sure kernel.org & LKML wouldn't want your
work for the same reason.  But it's technically possible.

You might also try asking Jan for an update of his work.

--

-- 
James Cameron                         http://quozl.netrek.org/
HP Open Source, Volunteer             http://opensource.hp.com/
PPTP Client Project, Release Engineer http://pptpclient.sourceforge.net/

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John Horne | 6 Jul 2006 00:09
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Re: Multiple unsupported protocol errors

On Wed, 2006-07-05 at 09:11 +1000, James Cameron wrote:
> On Tue, Jul 04, 2006 at 10:30:39AM +0100, John Horne wrote:
> > As far as I can tell Jan Dubiec's patches only go up to the 2.6.13
> > kernel. FC5 runs (currently) with a 2.6.17 kernel, so either we need
> > to drop back the kernel level, which may affect other things, or we
> > need to modify the existing mppe to support mppc based on Jan's
> > patches.
> 
> You're right, either drop back or port Jan's work to current kernel.org
> versions.  It's not something I can be involved in due to the MPPC
> patent issue, and I'm fairly sure kernel.org & LKML wouldn't want your
> work for the same reason.  But it's technically possible.
> 
Yes, I appreciate that the patent issue is a problem, and obviously why
MPPC is not even considered to be included in the kernel. This is not an
easy piece of work for me, so I am keen to make sure that I am not about
to repeat what someone else is already working on! :-)

Local tests have confirmed that MPPC is still required with the latest
PDA's we have (Orange M5000's I gather). Whether we proceed and try and
code something or not is being debated by my manager.

> You might also try asking Jan for an update of his work.
> 
Done that. No reply yet.

Thanks,

John.
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Alan Murray | 7 Jul 2006 16:57
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Re: Problems with ppp 2.4.4b1

Fabiano Rodrigo Boscatto <fabiano.boscatto <at> pucpr.br> writes:

> After an apt-get upgrade, i have this error in
> syslog:
> Jun 14 17:58:14 VPNCORP pppd[6203]: Plugin
> /usr/lib/pptpd/pptpd-logwtmp.so is for pppd version 2.4.3, this is 2.4.4b1

I temporarily fixed this problem by commenting out the line:

logwtmp

in /etc/pptpd.conf

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Gmane