Re: Network bridge usage.
> On Sun, Jan 01, 2023 at 11:31:38AM -0800, peter@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?
> 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)
>
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