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

[James C. <qu...@la...>]

Your network environment is probably unusual, with duplicate or
dropped packets.

Please try adding --missing-window 300 to the pptp command.

That was the default in 1.8.0, and it was disabled in 1.9.0.

On Thu, Sep 20, 2018 at 07:10:50PM +0000, dz wrote:
> Dear developers,
> 
> After upgrading Ubuntu and hence pptp-linux package to version 1.9.0+ds-2 my
> connection to an Asus home router-based pptp server dies after some minutes
> of active usage throwing in syslog a burst of dozens of messages
> "pptp[1320]: anon warn[pqueue_add:pqueue.c:151]: discarding duplicate packet
> nnnnn".
> The connection is still on and ppp0 is shown among interfaces but no data
> goes through. Disconnecting and re-connecting resolves the issue just for
> few minutes of active use.
> Uninstalling 1.9.0+ds-2 version of pptp-linux and installing instead
> pptp-linux_1.8.0-1_amd64.deb fixes the issue. Occasional single messages
> "discarding duplicate packet yyyyy" appear in the log with no impact to the
> connection. It stays on and works stable for days.
> The problem is repeatable. I have installed a fresh formatted test system
> with ubuntu-18.04.1-server-amd64 OS and pptp-linux v.1.9.0+ds-2 and the
> problem was there at once. Downgrading to pptp-linux_1.9.0+ds-1_amd64.deb
> does not solve the issue. Downgrading to v.1.8.0-1 does solve it at once.
> Providing a relevant fragment of syslog for the reference:
> ---
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58793
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58797
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58839
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58840
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58841
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58842
> ...
> Sep 19 23:12:18 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58884
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58885
> ...
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58906
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58907
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58908
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58909
> Sep 19 23:12:19 dz-test pptp[1320]: anon warn[pqueue_add:pqueue.c:151]:
> discarding duplicate packet 58910
> ---
> After the last line the connection became unusable.
> I could provide more information if needed.
> Please help to investigate the issue and possibly to resolve it in the next
> version of pptp-linux package.
> 
> With best regards, Dmitry
> 
> 
> 
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-- 
James Cameron
http://quozl.netrek.org/