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Re: [Openvpn-users] Wrong warning about mssfix/fragment


  • Subject: Re: [Openvpn-users] Wrong warning about mssfix/fragment
  • From: James Yonan <jim@xxxxxxxxx>
  • Date: Thu, 2 Dec 2004 09:46:48 -0700 (MST)

On Thu, 2 Dec 2004, Claas Hilbrecht wrote:

> --Am Mittwoch, 1. Dezember 2004 13:04 -0700 James Yonan <jim@xxxxxxxxx> 
> schrieb:
> 
> > In 2.0, we found that the vast majority of MTU problems that people tend
> > to have are solved by simply leaving the TUN/TAP mtu at 1500 and using
> > mssfix and fragment to limit the size of the UDP packets sent between
> > hosts.
> 
> Ok, this is somewhat different than 1.6. Do you have any recommandations 
> for using a mixed 1.6 <-> 2.0 network?

There's some info in the FAQ about this.  1.6 supports mssfix, it's just 
not turned on by default.

> I didn't see a default value noted for --mtu-disc type in the man page (on 
> <http://openvpn.sourceforge.net/man.html>).

The default is to do nothing, i.e. don't explicitly configure the socket
and let Linux default it -- probably Linux will use "yes" as the default.

James


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