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Date: Wed, 27 Oct 2010 10:48:54 -0700 From: Nolan Leake <nolan@...ulusnetworks.com> To: Jim <jim876@...all.nl> Cc: netdev@...r.kernel.org, David Miller <davem@...emloft.net> Subject: Re: tap0 device stopped working in 2.6.36 (ok in 2.6.35) On Wed, 2010-10-27 at 18:09 +0200, Jim wrote: > Not exactly, VirtualBox calls it "bridged adapter", it 'bridges' the > guest machine to the tap0 interface on the host for so called host-only > networking. > See eg. http://forums.virtualbox.org/viewtopic.php?f=1&t=165 OK, so you have the tap0 device, and you assign an IP to it and run dhcpd on it. Understood. Thank you for the explanatory link. > And this sequence is now simply failing > tunctl -t tap0 -u tuxuser > ifconfig tap0 10.0.0.1 up The link is not ready until some process has attached to the tap device. tunctl simply attaches and then immediately detaches, leaving it link-down until the virtualbox process starts and attaches. But this doesn't cause the problem for me! I suspect that is because I am running an ipv4 only kernel; the "ADDRCONF(NETDEV_UP): tap0: link is not ready" error comes from net/ipv6/addrconf.c. I have no idea why ipv6 vetos the upping of a link-down interface, while ipv4 doesn't care. If this is all intended behavior, then I guess I'll need to make the old "tap devices are always link-up" mode the default, and add a way for newer software to opt-in into correct link-state reporting. David (CC'd), could you comment on this? Thanks, Nolan -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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