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RE: [Openvpn-users] truncated-ip - 200 bytes missing


  • Subject: RE: [Openvpn-users] truncated-ip - 200 bytes missing
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Mon, 15 Sep 2003 19:09:40 -0000

Bert Shuler <bshuler@xxxxxxxxxxxxxxxxxxx> said:

Sounds like a possible MTU/fragmentation problem.  Try using a smaller MTU
size.  Another possibility is to use --mtu-dynamic, for internal
fragmentation.  You can also try different settings for --mtu-disc (but use
the same setting on each side).

MTU problems are generally caused by routers in the path which do not
correctly fragment packets or respond to "ICMP Fragmentation needed but DF
set" messages.

I am exploring different ways of working around these kinds of problems.  The
next beta release of OpenVPN will have a new option --fixmss which allows the
specification of an upper bound on the TCP MSS (That's the maximum payload
size per packet which TCP will use during a session).  This approach has been
reported to work wonders in fixing MTU/fragmentation problems.

James 

> this is with two tun adaptors .... Linux OS
> 
> -----Original Message-----
> From: Inode [mailto:inode@xxxxxxxxxxxxxxxx] 
> Sent: Monday, September 15, 2003 11:27 AM
> To: Bert Shuler
> Cc: openvpn-users@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Openvpn-users] truncated-ip - 200 bytes missing
> 
> 
> Hi, I got the same problem using openvpn...
> the problem was that I use a client windows and a server using 
> OpenBSD... The problem was that OpenBSD use TUN interface and Windows 
> use TAP interface. You have to use on the two client the same, or tun or
> 
> tap.
> 
> Inode
> 
> Bert Shuler wrote:
> 
> > Has anyone had any experience with this?
> > 
> > 13:45:02.310819 truncated-ip - 200 bytes missing!X.X.X.X.www >
> > Y.Y.Y.Y.2878: . 1:1461(1460) ack 328 win 6432 (DF)
> > 
> > 
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> 
> 
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