« Premiere libre en partant du haut » donnait la MEME adresse a deux VM
deployees en parallele : ni l'une ni l'autre n'est montee quand l'autre
cherche, donc aucune ne voit l'autre. Mesure — debian-12 et debian-13
ont tous deux pris .250 et se sont disputes l'adresse, une seule
survivant. C'est ce qui faisait echouer le 12 quand le 13 passait.
Le depart du balayage vient desormais du NOM de la VM, par crc32. Les
noms different toujours, la collision disparait, et le tirage reste
stable d'un redeploiement a l'autre. Le balayage garde ses garde-fous :
baux existants et adresses qui repondent restent ecartes.
Verifie : debian-12 -> .216, debian-13 -> .218.
--- EN ---
"First free from the top" gave the SAME address to two VMs deployed in
parallel: neither is up when the other looks, so neither sees the other.
Measured — debian-12 and debian-13 both took .250 and fought over it,
only one surviving. That is what made 12 fail while 13 went through.
The scan now starts from the VM NAME, via crc32. Names always differ,
the collision is gone, and the draw stays stable across redeployments.
The scan keeps its guards: existing leases and answering addresses are
still skipped.
Verified: debian-12 -> .216, debian-13 -> .218.
Assisted-by: Claude Opus 5
(cherry picked from commit 91592383e213ad98873125866e6120e5da5874fe)
Mathieu Benoit
788c17dbb5