Am Dienstag, den 04.08.2009, 14:43 +0200 schrieb Brett Serkez: > Ran into a strange issue with XEN on CentOS that I think is specific > to CentOS, which is why I'm starting by posting to this list first, > I'll post on the XEN list depending on responses. My sense is this > issue has something to do with how CentOS handles network setup on > first boot of the XEN kernel. > > - Installed a brand new CentOS 5.3 server with minimal packages. > > - Installed XEN, modified grub.conf to boot off of the XEN kernel and rebooted. > > - After reboot, network connectivity was lost. > > - Investigation concluded the issue was that the HWaddr address of the > physical NIC matched the fabricated HWaddr that XEN uses for most of > its adapters: FE:FF:FF:FF:FF:FF. When Xen starts does some trickery with your interfaces. You should see FE:FF:FF:FF:FF:FF on device peth0 and the real MAC-address on device eth0. All Xen vif devices will show also MAC FE:FF:FF:FF:FF:FF. That is totally normal. Chris financial.com AG Munich head office/Hauptsitz München: Maria-Probst-Str. 19 | 80939 München | Germany Frankfurt branch office/Niederlassung Frankfurt: Messeturm | Friedrich-Ebert-Anlage 49 | 60327 Frankfurt | Germany Management board/Vorstand: Dr. Steffen Boehnert (CEO/Vorsitzender) | Dr. Alexis Eisenhofer | Dr. Yann Samson | Matthias Wiederwach Supervisory board/Aufsichtsrat: Dr. Dr. Ernst zur Linden (chairman/Vorsitzender) Register court/Handelsregister: Munich – HRB 128 972 | Sales tax ID number/St.Nr.: DE205 370 553