Re: [Openvpn-users] TCP works UDP fails

[richard <rvenne@xxxxxxxxxxxxxxxxx>]

Giancarlo Razzolini wrote:
> Francois Wautier wrote:
>
> > Wait a tick... I have exactly the same problem.
> >
> > I have a Cisco router and things used to work with an older version of OpenVPN 
> > (1.6).
> >
> > Since I moved to v 2,  UDP doesn't work. TCP works like a charm.
> >
> > Looking at it, it seems that the server side is not responding, although it 
> > says it is.
> >
> > In my case, the Cisco router is doing DNAT for my server. It just looks as if 
> > NAT had stopped working for UDP packets. 
> >
> > My 2 cents,
> > 	François
> >
> >
> >
> >
> > > On Tuesday 05 July 2005 22:01, col_mil@xxxxxxxxxx wrote:
> > >
> > >
> > > > Have been stumped by this for months.
> > > >
> > > > Both server + client running debian sarge + openvpn 2.0-3.
> > > >
> > > > server receives client data via wireless access point on
> > > > eth1, (client is wireless)
> > >
> > > What is the manufacturer and model of access point? I had openvpn UDP
> > > problems with my D-Link DI-614+. The openvpn peer was on the Ethernet
> > > switch, not wireless, but I still suspect the router.
> > >
> > > Changing the router to DMZ mode (passing everything through to the
> > > openvpn peer) got things working again.
> > >
> > > I'm going to switch to a Linksys WAP and see if the openvpn UDP is
> > > NAT'ed properly. It always worked behind a Linux NAT firewall.
> >
> >
> >
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>
> I had these kind of problem with some d-link so called "router"
> (seriously, some of them are so confuse, that they doesn't deserve being
> called router). But it might also be a timeout. Try increasing the
> hand-window parameter to something more than 60 seconds and see what
> happens. If you still cannot get a connection, then try doing some
> traffic analisys with tcpdump or iptraf. If you don't see the packets
> coming on your machine, then you can surelly blame the router.

I got same troubles with netgear and another router. the link is breaken 
on each ISP's IP change. openvpn@UDP is unable to remount the link. I've 
hacked a little perl script to reconnect with a diffrent local port, 
which works fun. But in my case, that happens only with ONE ISP: France 
télécom ( yeah I know, they s**k a lot).

client(woody/sarge)->server(freebsd current stable)


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