A secondary DNS server at a branch office stopped receiving updates from the primary after a new firewall was installed between them. Ordinary name lookups through the firewall still work. The firewall allows only UDP 53. What is blocked?
Un serveur DNS secondaire d'une agence ne reçoit plus les mises à jour du serveur primaire depuis l'installation d'un nouveau pare-feu entre eux. Les résolutions de noms ordinaires à travers le pare-feu fonctionnent toujours. Le pare-feu n'autorise que UDP 53. Qu'est-ce qui est bloqué ?
Answers
ADHCP, which DNS depends onDHCP, dont DNS dépend
BICMP, which DNS uses to find the primaryICMP, que DNS utilise pour trouver le primaire
CZone transfers, which use TCP 53Les transferts de zone, qui utilisent TCP 53
DNTP, which DNS needs for timestampsNTP, dont DNS a besoin pour l'horodatage
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