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Re: [LUG] default ubuntu mirrors
- To: list@xxxxxxxxxxxxx
- Subject: Re: [LUG] default ubuntu mirrors
- From: Michael Everitt <michael@xxxxxxxxxx>
- Date: Sat, 18 Apr 2020 16:06:20 +0100
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On 17/04/20 20:58, comrade meowski wrote:
> On 17/04/2020 20:31, comrade meowski wrote:
>
>> I've double checked at multiple sites but just for my own peace of mind
>> before I start bothering mirror maintainers I'd like some confirmation.
>> A local Arch VM is also timing out on mirrors so it's infrastructure
>> related somewhere out there.
>
>
> Damn it, thank god I checked and kept digging before pestering mirror
> admins... Found a show stopping bug deep in the network stack that
> reaches out sideways into numerous other inter-related subsystems and am
> already dying inside thinking about how to triage and fix this...
>
> Certain hypervisor platforms + bridged virtual NICs + host with bonded
> physical NICs + certain guest operating systems results in "double
> MACcing" and obvious fatal breakage. I can flip effected VMs from bridged
> to NAT mode and the problem goes away (it also makes the VMs unusable for
> production so that's literally no good whatsoever).
>
> Behold this horror:
>
> ghost@failbot:~/SRC$ ssh archway.REDACTED 'cat /etc/live/dhcp.leases' |
> head -n 3
> 1587237812 08:00:27:05:4a:66 10.10.10.114 zfsbot
> ff:e2:34:3f:3e:00:02:00:00:ab:11:aa:b6:c9:f2:38:c7:c6:45
> 1587237553 08:00:27:9f:8b:25 10.10.10.120 discobiscuit
> ff:e2:34:3f:3e:00:02:00:00:ab:11:53:b6:81:ac:6c:56:2f:dd
> 1587223151 08:00:27:a9:35:a4 10.10.10.67 archipelago
> ff:27:a9:35:a4:00:01:00:01:22:1d:e3:12:08:00:27:a9:35:a4
>
> A recent cross-operating system upgrade has done this somewhere and this
> is not going to be a nice one to fix. To the internet!
>
Hmm, but how is that affecting routing . MAC is physical layer, that should
theoretically make (virtually!) no difference? What problem is that causing
higher up the stack??
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