Re: [pptp-devel] pptp connection dies in pptp-linux_1.9.* Works fine in pptp-linux_1.8.0-1

[dz <dz...@gm...>]

Hello Christoph,

Thanks for your help and detailed reply.
I cloned git repository of pptp-linux and messed a bit with various 
versions.
Providing the summary.
- the baseline of the 'good behaviour' is still 
pptp-linux_1.8.0-1_amd64.deb; it throws occasional single 'discarding 
duplicate packet' messages but keeps the steady connection for days
- I was not able to determine corresponding 'good' baseline while 
compiling packages myself;
- 1.8.0 compiles with several warnings in a numer of .c files and the 
resulting package does not keep the steady connection
- compiled 1.9.0 stalls the connection and altogether drops it with no 
'discarding duplicate packet' messages in syslog
- compiled 1.10.0 keeps the connection for longer (some several hours) 
but eventually stalls it with the same 'discarding duplicate packet' 
burst in the log
- under the circumstances it would be hard to proceed with 'git bisect' 
as there is no 'good' baseline among packages compiled from source
My suggestions:
- compiling at my default Ubuntu 18.04.1 server system seems to provide 
packages somehow different from *.deb; maybe some compiling options 
should be changed;
- my specific VPN server is an Asus home router based PPTP server; maybe 
it is not enough performant and hence creates such challenging 
conditions for the client; '--loglevel 1' shows numerous packet 
reordering messages;
- I still think that stalling the connection under such conditions is 
related to some bug/memory leak issue in packages after 
pptp-linux_1.8.0-1_amd64.deb

Would play more with my test system. I've not compared the memory usage 
yet.

Regards, Dmitry