Thanks for your replies. I just checked OpenVPN access server and saw that in "server network setting" and in protocol selection you can select Multi-Daemon mode. I thinks that's what exactly I need. Is it implemented via tun + routing?
________________________________ From: David Sommerseth <openvpn.l...@topphemmelig.net> To: openvpn-devel@lists.sourceforge.net Sent: Monday, December 17, 2012 12:28 PM Subject: Re: [Openvpn-devel] multiple OpenVPN instances on a single tun On 17/12/12 09:31, ehsan enayati wrote: > Hi, > I need to run multiple instances of OpenVPN server on just one tun > device driver (say tun0) all on same subnets. I tried editing the > open_tun function in tun.c file, first instance goes well and creates > tun0 but when the second one comes along it cannot use tun0 and I get > the error "ioctl(TUNSETIFF): Device or resource busy". I really need > this functionality. Please give me some hints. It is not possible to do what you try to do. Only one application can bind to a tun or tap socket. It's basically the same issue if you try to have more applications bind and listen to, say port 80, at the same time. It's impossible. And it's restricted by the OS. If you need OpenVPN instances to be on the same subnet, you can use TAP and bridge tap0 and tap1 together. *But* I 'd rather recommend to use tun devices, have them on separate subnets and do the rest with routing. Using tun + routing is by far the cleanest and easiest configuration setups. It also gives the lowest traffic overhead and least headache while debugging the configuration when it fails. -- kind regards, David Sommerseth ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Openvpn-devel mailing list Openvpn-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openvpn-devel
