On Mon, Nov 15, 2010 at 11:01:57AM -0700, Phil Meyer wrote: > On 11/12/2010 10:47 AM, Phil Meyer wrote: > >Pleas guide me as to where and/or who would work this bug: > > > >Fedora 12+ and RHEL6 both suffer this issue. > > > This was caused by the new seabios booting much faster than the old > BIOS. Thus causing the dhcp request to run afoul of the 15 second > default delay in the 'new bridge' traffic. > > By default, a new bridge on RHEL defaults to a 15 second delay before > any traffic can pass over the new bridge. > > This is a 'convention' used to prevent bridge loops from causing network > meltdowns. > > By setting the delay to 5 seconds, everything works perfectly. > > To display the current setting: > > # brctl showstp br0 | grep -i delay > forward delay 14.99 bridge forward > delay 14.99 > > To set it: > > # brctl setfd br0 5
In the libvirt networking docs we recommend using DELAY=0 to avoid this problem. Even 5 seconds can be too long in some scenarios, and provided you're not putting multiple physical NICs in one bridge, or attaching a guest to multiple host networks, you'll be safe from loops http://wiki.libvirt.org/page/Networking#Creating_network_initscripts Regards, Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| _______________________________________________ virt-tools-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/virt-tools-list
