Hi,

On Tue, Jun 02, 2015 at 06:38:59PM +0800, Zesen Qian wrote:
> Is using tap instead of tun my only choice? As I 've already seen
> packets flowing out of the tun interface in the server end, the only
> problem is that the packets is not forward to another interface.

Might be rp_filter getting in the way, if you routing is not set up
symmetrically on the server side (outside OpenVPN).  Hard to say without
further details.

And no, don't go to tap unless you fully understand why tun is not 
possible for you - there are a few scenarios (transparent bridging between
networks to make IPX or multicast work, for example, or "AIX machines
that do not have tun interfaces") but usually tun is the better choice.

gert
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Gert Doering - Munich, Germany                             g...@greenie.muc.de
fax: +49-89-35655025                        g...@net.informatik.tu-muenchen.de

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