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Date: Sat, 17 Sep 2011 22:42:57 +0200 From: Marc Haber <mh+netdev@...schlus.de> To: netdev@...r.kernel.org Subject: Re: Bridge stays down until a port is added On Thu, Aug 11, 2011 at 08:17:06AM -0700, Stephen Hemminger wrote: > On Thu, 11 Aug 2011 09:06:59 +0200 > Marc Haber <mh+netdev@...schlus.de> wrote: > > New new behavior is somewhat unhandy when one uses the bridge address > > for services that the host offers, to save on IP addresses and > > networks (for example, when one has only a single IP address and a > > single additional network), since one has to take extra measures to > > have the addresses on the bridge interface reachable. > > > > Or am I doing things wrong? > > The goal is to make the bridge behave the same as a vlan or > a physical device. Could you explain better what the application(s) > would expect. The situation of a bridge is quite different from a physical ethernet interface. The physical interface is usually connected to a switch and is thus immediately up, even if no systems other than the switch are online. In the case of a bridge on a virtualization host used to connect virtual machines, the bridge only goes up after the first VM was started. In the IPv6 SLAAC case, the host tries start its radvd on the bridge well before the first VM comes up, the radvd barfs since the interface is not up, does not come up, and the VMs are without network. In this case, it is needed to force the bridge into an UP state earlier so that radvd can start. If people are supposed to add a dummy interface to the bridge if they want to use ipv6, this should be documented. And it's ugly. Greetings Marc -- ----------------------------------------------------------------------------- Marc Haber | "I don't trust Computers. They | Mailadresse im Header Mannheim, Germany | lose things." Winona Ryder | Fon: *49 621 72739834 Nordisch by Nature | How to make an American Quilt | Fax: *49 3221 2323190 -- 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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