On Thu, 2017-12-28 at 15:00 +0100, Manuel Schölling wrote: > Hi, > > I am currently developing a wireguard VPN plugin [1] for > NetworkManager. > I am wondering how the device configuration works for VPN devices. > > You can get the IP settings using > nm_connection_get_setting_ip4_config(). It is the VPN plugin's job to > apply these settings, right? > What I do not get, yet, is why does the plugin report these settings > back to NM using nm_vpn_service_plugin_set_ip4_config()? > NM already knows these settings - or is it just to confirm back to NM > what settings were really applied? > > And how does it work for DHCP? Does NM start an DHCP client daemon > for > the device that was created or is it the plugin's job to run a DHCP > client? > > Thanks! > > Manuel
Hi Manuel, AFAIK, none of the existing NM VPN plugins do DHCP on the link themself. Although that would be of course useful, for example with a openvpn+tap interface. E.g. https://bugzilla.gnome.org/show_bug.cgi?id=741487 I think re-implementing DHCP client functionality inside the VPN plugin would be a bad solution, because of the duplication of work. A better solution would be to extend the VPN API so that NM can do DHCP on such links. That is however quite some work (patches welcome ;-) ). I tend to think that VPN plugins are not as great as they should be. There are some advantages of having a plugin compared a native device- type in NetworkManager itself, but there are also downsides. Especially it adds complexity and code duplication. Moreover, the plugin API may be too limited/restricted, and it is a lot of effort to get simple things done. I personally, would not add a VPN plugin but a native device type in NetworkManager itself. For example like MACSec: https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=1a24f528c8645148e9612adff34d6edf70fdbb34 Of course, this is not very helpful for you. Sorry for that. best, Thomas
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