Re: [Openvpn-users] tcp over tcp with udp problem?

[Michael Hale <michaelh@xxxxxxxxxxxxxxxx>]

On Nov 5, 2003, at 6:03 PM, James Yonan wrote:

> Michael Hale <michaelh@xxxxxxxxxxxxxxxx> said:
>
> > Hi I was wondering if the way openvpn is implemented, if it suffers
> > from the problem of tcp running over tcp
> > (http://sites.inka.de/sites/bigred/devel/tcp-tcp.html)?  It seems like
> > running with the udp connection would solve this problem, but I wanted
> > to ask the people who wrote this software explicitly just to make sure
> > ;-)
>
> As a tunnel transport, UDP is almost always a better choice from a 
> performance
> perspective, though TCP can work reasonably well if the network is not
> congested.  As the network becomes more congested and the percentage of
> dropped packets goes up, a TCP tunnel's performance will drop off more 
> sharply
> than a UDP tunnel, because of the reliability layer collision which is 
> cited
> in the article.
Could  you describe the structure of the UDP packets that get sent 
across?  Specifically I am interested in how connections are maintained 
across the UDP-SSL tunnel, since UDP does not offer guarantee of 
delivery.
> OpenVPN originally supported UDP only, but TCP support was eventually 
> added
> due to overwhelming popular demand.  Of course things didn't stop 
> there...
> soon we were tunneling over HTTP.  I suppose it's just a matter of 
> time before
> someone suggests tunneling IP over SMTP :)
>
> James


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