Hi, On 06/06, Lennart Poettering wrote: > Date: Fri, 6 Jun 2014 15:43:21 +0200 > From: Lennart Poettering <lenn...@poettering.net> > To: Mantas Mikulėnas <graw...@gmail.com> > Cc: systemd Mailing List <systemd-devel@lists.freedesktop.org> > Subject: Re: [systemd-devel] Systemd-networkd, default route and multiple > interfaces > User-Agent: Leviathan/19.8.0 [zh] (Cray 3; I; Solaris 4.711; Console) > > On Wed, 04.06.14 00:29, Mantas Mikulėnas (graw...@gmail.com) wrote: > > > > > On Tue, Jun 3, 2014 at 9:58 PM, Lennart Poettering > > <lenn...@poettering.net> wrote: > > > > > > On Mon, 02.06.14 21:02, Tom Gundersen (t...@jklm.no) wrote: > > > > > > > On Mon, Jun 2, 2014 at 8:47 PM, Reventlov > > > > <contact+systemd...@volcanis.me> wrote: > > > > > Since network files are applied to links whenever the links > > > > > appear, how do systemd manage the "disappearance" of a default route ? > > > > > > > > You can have several default routes, so we just configure them all and > > > > let the kernel handle it for us. We probably should improve the config > > > > options to make it possible to override the priority of the routes. > > > > > > Windows initializes the route metric value for each route from the > > > "speed" of the interface. If there are multiple links and for one we > > > know it's a gigabit ethernet link, and the other is a 54mbit wlan link, > > > then the former would automatically get preference... it's a bit black > > > magic, but kinda cool black magic i think... > > > > > > that said, i am not sure we even have a sane API to determine the speed > > > of links... maybe ethtool reports it at least for wired ethernet? but > > > for wlan? > > > > Both `iwconfig <dev>` and `iw <dev> link` report the link speed (one > > using the old wext and the other nl80211, I think?). > > > > No idea about all the other link types that Linux supports though. > > As long as we'd only have to check ethtool for wired ethernet and the > wireless stack for wireless ethernet and can cover 70% of all devices > with that, this sounds like the right thing to do for me...
Note, however, that wlan link speed can fluctuate in time. At least that's what happens with eduroam at our university (mostly cisco APs). Also, when comparing wlan and eth link speeds, does one take into account the different overheads due to frames, encryption, etc., or just compare bare speeds? Cheers, Leonid. -- Leonid Isaev GPG fingerprints: DA92 034D B4A8 EC51 7EA6 20DF 9291 EE8A 043C B8C4 C0DF 20D0 C075 C3F1 E1BE 775A A7AE F6CB 164B 5A6D
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