Re: [Openvpn-users] MULTI: Outgoing TUN queue full, dropped packet openvpn 2.0 linux 2.2.25

[James Yonan <jim@xxxxxxxxx>]

On Tue, 12 Jul 2005, cisco wrote:

> every thing work well, until the VPN froze for few minutes
> 
> on the server I get the log 
> 
> openvpn/83.214.128.57:65036 MULTI: Outgoing TUN queue full, dropped
> packet len=40
> 
> I try in proto udp it does the same except than it crash
> 
> us=595883 Assertion failed at multi.c:1559
> 
> James Change Log:2004.12.20 -- Version 2.0-rc6
> speak about some change 
> " Made the "MULTI TCP: I/O wait required blocking in
>   multi_tcp_action, action=7" error nonfatal and replaced
>   with "MULTI: Outgoing TUN queue full, dropped packet".
>   So far the issue only seems to occur on Linux 2.2
>   in --mode server --proto tcp mode.  It occurs when
>   the TUN/TAP driver locks up and refuses to except
>   new packet writes for a second or more."
> http://openvpn.net/archive/openvpn-users/2004-12/msg00563.html
> 
> What is the solution ???
> 
> Openvpn 2.0
> linux 2.2.25
> tun 1.1 http://vtun.sourceforge.net/tun/index.html
> 
> Ps: I try on a knoppix 2.4.26 with the same config I did not succeed to
> stalled it 

Yes, this has been reported a few times, but only on Linux 2.2.  I would take a 
look at it, though I don't currently have access to a 2.2 box.

Here's a patch to try:

--- event.c~    2005-04-10 21:43:56.000000000 -0600
+++ event.c     2005-07-12 11:39:01.997309472 -0600
@@ -37,6 +37,8 @@

 #include "memdbg.h"

+#define SELECT_PREFERRED_OVER_POLL
+
 /*
  * Some OSes will prefer select() over poll()
  * when both are available.

this would help to confirm or rule out the possibility that the change 
from select (in 1.6) to poll (in 2.0) might be causing the problem.

James


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