> > On Sun, Jan 01, 2023 at 11:31:38AM -0800, pe...@easthope.ca wrote: > > > Greetings for the New Year to Debian users, > > > > > > Verifying and updating instructions here. > > > https://en.wikibooks.org/wiki/Oberon/ETH_Oberon/QEMUinstall#Network_Connection_on_a_Virtual_Machine > > > Questions (1) and (2) follow. > > > > > > root@joule:/home/root# ip link show br0 > > > 4: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue > > > state DOWN mo de DEFAULT group default qlen 1000 > > > link/ether 92:e0:54:07:2a:e2 brd ff:ff:ff:ff:ff:ff > > > > > > br0 is a virtual interface; not connected to hardware. > > > (1) How is address 92:e0:54:07:2a:e2 derived? > > > > It's first quad is 9, binary 0110. > > Eh? 9 is 0101 in binary! 0110 is denary 10. The last bit in a binary > number determines whether a number is odd or even. > > So I think this means universally administered?
Oops. The U/L bit is actually 1 I think, the last one in 01010010. So yes, locally administered. > > The second bit is set: this > > tells you that it is a locally administered address [1] > > > > Typically it's the VM hypervisor who's in charge of generating > > one (ideally in a way that it doesn't collide with others). For > > example, qemu-xxx have a command line parameter `mac' for that. > > > > Cheers > > > > [1] > > https://en.wikipedia.org/wiki/MAC_address#Universal_vs._local_(U/L_bit) > > >
