Hi, * Alf [Thu Nov 04, 2021 at 08:24:35PM +0100]:
> Having 2 tiny servers (APU2.C4 and APU.2D4) in my local net each having > 3 ethernet interfaces assigned to a bridge "br0" (configured in > /etc/network/interfaces). > Upgrading from Bustser to Bullseye worked fine for the first box, the bridge > received a new MAC assigned by the kernel as described in the listchanges. > After reconfiguring that in the roter everything was working as before. > > Upgrading the second box in the same network segment lead to almost complete > blocking of traffic in my local network and the 2nd box was not detected by > the router. > Connecting via serial console and checking network setup revealed: > > The second box got precisely the SAME MAC address as the first box! > After using bridge_hw to assign the old MAC based on the MAC of one interface > solved the problem. > > Conclusion is that hardware addresses should be unique in general, but the > current way generates same address also if the MAC's of involved interfaces > differs - see here: [...] Could it be, that the two systems use the same machine ID? (See e.g. https://github.com/systemd/systemd/issues/21185) regards -mika-
signature.asc
Description: PGP signature
