[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] ipv6 addresses on vifX.Y interfaces and bridges
Am Sonntag, 6. Januar 2008 23:48:13 schrieb Daniel P. Berrange: > On Mon, Jan 07, 2008 at 09:44:09AM +1100, James Harper wrote: > > > On Mon, Jan 07, 2008 at 09:26:43AM +1100, James Harper wrote: > > > > The network scripts appear to set noarp on all the vifX.Y and > > > > xen-brX > > > > > > interfaces, but I also need to remove the IPv6 address and stop the > > > > interfaces participating in autoconfiguration... > > > > > > > > Has anyone done this already? > > > > > > You don't need to remove the link-local IPv6 addresses, they are > > > > harmless. > > > > > The key is to stop auto-conf taking place on the bridge. The way todo > > > this is to set the mtu of the bridge to something tiny (eg 68) before > > > bringing the interface up, and then once it is up, restore the mtu to > > > its normal 1500. > > > > > > This was previously merged in xen-unstable, in 13364 > > > > That sounds a bit kludgy... wouldn't it be better to make use of > > /proc/sys/net/ipv6/<interface>/autoconf and/or .../accept_ra? > > Would have to ask Herbert about that - when he wrote the patch this was > the only reliable way of selectively disabling Ipv6 on the bridge, but > not other eth devices. > > > Wouldn't the bridge just autoconf next time an ra is sent once its mtu > > is back up to 1500? > > No, because the low MTU means it never gets assigned a link-local address > and thus has no way to parcitipate in ipv6 autoconf thereafter. But it's a dirty hack, isn't it? what about just using the ip tool to get rid of the ipv6 address after the interface has been configured? "ip -6 addr flush dev ethX" (or whatever device) should do the trick... :) it removes any global or local address on the interface and prevents any further autoconfiguration. > Dan. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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