On 02Aug2021 09:04, John Mellor <john.mellor@xxxxxxxxx> wrote:
>On 2021-08-01 7:08 p.m., Cameron Simpson wrote:
>>We've got a few unmanaged netgear switches here and have had some
>>weirdness ourselves. I have lossely discovered that having my Mac on
>>both ethernet and wifi at once causes the LAN to go sour.
>>. . .
>
>Huh? Am I misinterpreting? The MAC is supposed to be world-wide
>unique to each interface.
As I said, the actual meachanism is unverified. We have strong
circumstantial evidence that if my Mac has wifi on and I activate the
ethernet as well, sometimes the local LAN wigs out. There's no router
stuff here - access to other hosts on the same LAN stops working.
Unmanaged switches involved, and power cycling a switch has sometimes
brought order again.
I conjecture stuff like ARP requests getting answered from the wrong
interface, or something. I'd have to experiment with tcpdump some time.
I don't have the same MAC on two interfeaces, but other confusion may
abound. I know the firewall complains constantly about this:
arp info overwritten for 172.16.3.17 by 00:f7:6f:d5:2d:d4 on vr2
arp info overwritten for 172.16.3.17 by 68:d9:3c:8a:bd:dd on vr2
I'm actually unsure what's using that address :-(
Cheers,
Cameron Simpson <cs@xxxxxxxxxx>
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