[systemd-devel] Antw: [EXT] Re: network-online.target time

[Ulrich Windl]

>>> Peter Morrow <Peter.Morrow at microsoft.com> schrieb am 06.05.2020 um 17:56
in
Nachricht
<21624_1588780597_5EB2DE35_21624_6_1_aa19cc55fd1846a2344357bfb5465a645993bf1a.ca
el at microsoft.com>:
[...]
>> 
>> You can turn that off if you like: IPv6DuplicateAddressDetection=
> 
> This option worked well when I tried it (total time came down to
> ~700ms) but unfortunately disabling it entirely isn't an option.
> 
> FWIW setting CONFIG_IPV6_OPTIMISTIC_DAD=y in the kernel is providing a
> good middle ground.

As a note from real life: A major IT company claiming to be the horsepower for
enterprises, (so to say) once sent out a replacement motherboard for a
defective server, and when we powered up that server again, a storage system
from the same company failed. As it turned out the new motherboard had the same
MAC address as that storage system's NIC...
When the technician suggested to replace the server motherboard again, I was
asking whether it wouldn't be easier for all if the MAC address would be
re-programmed. The technician said that it's impossible to change the MAC
addresses... ;-)

Long story put short: Tests for duplicate addresses DO make sense....

> 
> Peter.
> 
> 
>> Lennart
>> 
>> ‑‑
>> Lennart Poettering, Berlin
> 
> 
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