Bish: VTun is not included in FreeBSD, but is available as a port which works in "userland." This implementation has much higher overhead than a Netgraph implementation would, because Netgraph operates within the kernel and is heavily multi-threaded. For this reason, and also because of the quality of the Netgraph and mpd code, most FreeBSD users use mpd for tunneling protocols, including PPTP, PPPoE, and L2TP. VTun, which is similar in many ways to L2TP, would work best if implemented the same way.
Engineering-wise, doing this is not very difficult; the only issue is licensing. A Netgraph implementation would need to be BSD-licensed, which means obtaining permission to license a port of the code that way. This is frequently done with device drivers and other code that's ported to the BSDs. Implementing VTun under Netgraph would greatly increase its level of acceptance and use in BSD systems and BSD-based appliances, so it seems to me that it would be desirable to the development team and user community. The source would, of course, be available as part of FreeBSD. The other option is to re-implement the protocol from a spec -- if one exists. The problem is that in the case of VTun, the code may really BE the only complete specification. --Brett Glass At 11:10 PM 1/30/2012, bishop wrote: >Hi Brett, > >VTun is included in the ports already, is it not? > > - bish > >Brett Glass wrote: >>All: >> >>I'm interested in determining whether it's practical to add VTun to >>the suite of VPN protocols supported by FreeBSD's mpd >>(multi-protocol daemon). mpd currently handles PPTP, PPPoE, and L2TP. >> >>The work would require creating a module for FreeBSD's Netgraph >>system (probably called ng_vtun) and adding code to mpd to support it. >> >>The only issue I see with creating the implementation isn't >>technical but legal. Because the module would be a FreeBSD kernel >>module, it would need to be BSD-licensed, so to do the port I would >>either need to implement the code from scratch from the >>specification or get permission for the FreeBSD version to be >>licensed under the BSD License. Is there a list of contributors to >>the VTun code who could be asked for permission to do the latter? >> >>--Brett Glass > > > >----- >No virus found in this message. >Checked by AVG - www.avg.com >Version: 10.0.1416 / Virus Database: 2109/4777 - Release Date: 01/30/12 ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Vtun-Users mailing list Vtun-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/vtun-users
