Re: [Openvpn-users] Read from tun appears to be failing - GET INST BY VIRT [failed]

[James Yonan <jim@xxxxxxxxx>]

On Fri, 4 Mar 2005, Bradley Schatz wrote:

> Hi,
> 
>  
> 
> I am attempting to connect a winxp client to a linux 2.6.x server, both
> running openvpn-2.0_rc16, using the tun method over udp. The windows
> firewall is disabled for the tun adapter, and on the linux server I have the
> firewall rules allowing all traffic from and to the tun adapter allowed,
> using INPUT, OUTPUT and FORWARD rules. 
> 
>  
> 
> Both the client and the server initialize correctly, saying "Initialization
> sequence completed", and using tcpdump on my external interface, see  udp
> packets going back and forward between the two hosts on the openvpn port on
> a regular basis. I assume this is some keep alive mechanism. 
> 
>  
> 
> >From the server, where the tun address is 10.1.52.1, and its point to point
> address is 10.1.52.2, I cannot ping the ptp address (nor any of the remote
> ip addresses) Running tcpdump on the tun interface, I see the ping requests,
> but no responses. The rate of UDP packets generated by openvpn does not
> appear to be affected at all. It appears that the traffic read from the tun
> adapter is being silently dropped.
> 
>  
> 
> Looking into the log I see the following what does this mean?
> 
>  
> 
> Mar  4 09:54:11 digger openvpn[8847]:  read from TUN/TAP returned 84
> 
> Mar  4 09:54:11 digger openvpn[8847]: GET INST BY VIRT: 10.1.52.2 [failed]

This means that OpenVPN didn't know what to do with a packet that had a 
destination address of 10.1.52.2, so it dropped it.  This is probably an 
issue with your configuration files.

James


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