[pptp-server] SMP 2.2.14-5.0 Problem

[Michael St. Laurent]

Charlie's probably right on the money with this one.  I've downloaded the
source RPMS from the e-smith site, modified the spec file to make it compile
for the kernel version I have and then installed the results.  I don't know
if it has fixed the problem for certain as I usually only had a crash every
few days or so but the fix "sounds right."  If you wish to try the same
thing you will also need to download and install the RPM for libsmbpw before
the ppp-2.4.0-10 package will build.


--------------------
Michael St. Laurent
Hartwell Corporation


> -----Original Message-----
> From: Charlie Brady [mailto:charlieb at e-smith.com]
> Sent: Monday, April 23, 2001 2:28 PM
> To: Michael St. Laurent
> Cc: 'pptp-server at lists.schulte.org'; 'zlowry at home.com'; 'Mike
> McPherson'; 'Jamin Collins'; 'Pete Starzewski'
> Subject: RE: [pptp-server] SMP 2.2.14-5.0 Problem
> 
> 
> 
> On Mon, 23 Apr 2001, Michael St. Laurent wrote:
> 
> > OK, it appears that poptop working for some but not for 
> others on SMP
> > machines.  Perhaps we might find a pattern if we all 
> reported to the list
> > what versions and patches are being used and on what 
> motherboard it is being
> > run.
> >
> > I'll go first:
> >
> > Software:
> > -----------------------------------------
> > PoPToP - 1.1.2
> > pppd - 2.3.11
> > Redhat - 7.0
> > Kernel - 2.2.17-14smp
> 
> PoPToP - 1.1.2
> pppd - 2.4.0
> e-smith 4.1.2, which is based on Redhat - 7.0
> Kernel - 2.2.16-22smp
> 
> > Patches:
> > -----------------------------------------
> > MSChap-v2 & MPPE Encryption for 2.3.11
> > Require-MPPE
> > Strip MS Domain
> 
> An smbpasswd patch
> My MPPE stateful patch
> 
> You can all find ppp-2.4.0-11.{src,i386}.rpm on our ftp site, which
> builds/installs a suitably modified pppd and the supporting kernel
> modules. Rather than have a name clash with the existing 
> ppp.o, this rpm
> includes a module named ppp-4mppe.o. In order for it to be 
> loaded rather
> than the RedHat ppp.o, one needs an entry "alias ppp ppp-4mppe" in
> /etc/modules.conf.
> 
> Based on my experience developing this RPM, the most likely 
> problems you
> might have with SMP is getting the compile arguments just right when
> compiling kernel modules.
> 
> Now, a development RFC. The only difference between ppp.o and 
> ppp-4mppe.o
> is the maximum allowed size of the argument block sent to the 
> kernel ppp
> module by ioctl calls. This is defined by 
> CCP_MAX_OPTION_LENGTH, and is
> increased from 32 bytes to 64 bytes to allow MPPE keys to be 
> communicated
> from the ppp daemon to the mppe kernel module.
> 
> If the communication protocol was changed so that a pointer 
> to the key was
> sent, rather than the key itself, then people wouldn't need to replace
> their vendor's ppp.o module, they'd just add the ppp-mppe.o 
> module, and
> replace pppd. The ppp-mppe.o module would need to take the pointer and
> copy the key from user to kernel space.
> 
> Any objections? Anyone care to help me develop and test the changes?
> 
> -- 
> 
>   Charlie Brady                         charlieb at e-smith.com
>   http://www.e-smith.org (development)  
http://www.e-smith.com (corporate)
  Phone: +1 (613) 368 4376 or 564 8000  Fax: +1 (613) 564 7739
  e-smith, inc. 1500-150 Metcalfe St, Ottawa, ON K2P 1P1 Canada



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