Re: Is it possible to set MTU for a vpn connection

[David Woodhouse <dwmw2 infradead org>]

On Thu, 2009-09-10 at 13:11 -0700, Dan Williams wrote:
> On Thu, 2009-09-03 at 02:31 +0530, ritz wrote:
> > On Wed, 2009-09-02 at 10:56 -0400, Derek Atkins wrote:
> > > ritz <khadgaray gmail com> writes:
> > > 
> > > > Hello
> > > >
> > > >   I do not see any option to set MTU under NMSettingVPN. All I could
> > > > find was for ethernet, and wireless. Are there any plans to add this ?
> > > 
> > > The way I do this is manipulating the helper script to reset the MTU
> > > after the VPN comes up.  It's a PITA.
> > > 
> > > > reference:
> > > > http://live.gnome.org/NetworkManagerConfiguration
> > > > http://bugzilla.gnome.org/show_bug.cgi?id=584200
> > > 
> > > -derek
> > 
> > 
> > vpnc-console uses the the below to set MTU correctly
> > 
> >         if [ -n "$INTERNAL_IP4_MTU" ]; then
> 
> INTERNAL_IP4_MTU is pretty new I guess?  Must be added in 0.5.x I guess.
> In any case, the patch below is about what should get used, yes.

No, vpnc doesn't set $INTERNAL_IP4_MTU at all -- it's only there in
vpnc-script for the benefit of openconnect (which _does_ negotiate with
the server and set it appropriately).

-- 
David Woodhouse                            Open Source Technology Centre
David Woodhouse intel com                              Intel Corporation