diff --git a/migration.mk b/migration.mk
index 9f78a8e..0f6ab4a 100644
--- a/migration.mk
+++ b/migration.mk
@@ -51,7 +51,12 @@ $(OLDBINDDIR):
 # A nice rule for the command-line.
 migration-file: $(MIGRATION_FILE_TARGET)
 
-migration: build-client migration-file run-migration-client run-client-genzones copy-old-zones
+fix-old-zones-ns:
+	@echo "fix old zones NS entries"
+	sed -i "s/ns0.arn-fai.net/ns0.karchnu.fr/g"        $(OLDBINDDIR)/*
+	sed -i "s/alsace.tetaneutral.net/ns1.karchnu.fr/g" $(OLDBINDDIR)/*
+
+migration: build-client migration-file fix-old-zones-ns run-migration-client run-client-genzones copy-old-zones
 	@echo "next as root: make powerdns-add-zones"
 
 # POWERDNS RULES
diff --git a/tools/powerdns-sync.cr b/tools/powerdns-sync.cr
index 9671849..0e3e6c5 100644
--- a/tools/powerdns-sync.cr
+++ b/tools/powerdns-sync.cr
@@ -1,8 +1,40 @@
+# Duration to wait before taken modification into account (in minutes).
+duration = 5
+
 if ARGV.size != 2
 	puts "usage: #{PROGRAM_NAME} dnsmanagerd-bind9-dir powerdns-bind9-dir"
 	exit 0
 end
 
+class BrainlessLog
+	class_property last_text_size : Int32 = 0
+
+	# In case the lastly `unimportant` written string is to be kept on-screen.
+	def self.important(str : String)
+		unimportant "" # Clear the line and last_text_size = 0
+		STDOUT.puts str
+	end
+
+	# Log something that isn't important, meaning text that will be
+	# rewritten in-place since we don't really want to read it.
+	# WARNING: user may want to keep the lastly written string, `keep` it.
+	def self.unimportant(str : String)
+		STDOUT.write ("\r" + (" " * self.last_text_size)).to_slice # Clear the line.
+		self.last_text_size = str.size
+		STDOUT.write ("\r" + str).to_slice
+	end
+
+	# In case the last `unimportant` string is to be kept on-screen.
+	def self.keep
+		STDOUT.puts "" unless self.last_text_size == 0
+	end
+
+	# In case the last `unimportant` string should be removed.
+	def self.flush
+		unimportant "" if self.last_text_size > 0
+	end
+end
+
 class Context
 	class_property dnsmanagerd_dir : String = ""
 	class_property powerdns_dir    : String = ""
@@ -11,11 +43,13 @@ end
 def copy_domain_files(domain : String) : Nil
 	src  = "#{Context.dnsmanagerd_dir}/#{domain}"
 	dest = "#{Context.powerdns_dir}/#{domain}"
-	puts "copying #{src} -> #{dest}"
+	BrainlessLog.important "copying #{src} -> #{dest}"
 	i = File.info src
 	File.copy src, dest
 rescue e : File::AccessDeniedError
-	puts "You don't have enough rights: #{e}"
+	BrainlessLog.important "You don't have enough rights: #{e}"
+rescue e : File::Error
+	BrainlessLog.important "File error: #{e}"
 end
 
 def run_process(cmd : String, params : Array(String), env : Hash(String, String)) : Nil
@@ -30,25 +64,25 @@ def run_process(cmd : String, params : Array(String), env : Hash(String, String)
 end
 
 def pdns_reload(domain : String) : Nil
-	puts "reloading a domain: pdns_control bind-reload-now #{domain}"
+	BrainlessLog.important "reloading a domain: pdns_control bind-reload-now #{domain}"
 	run_process("pdns_control", [ "bind-reload-now", domain ], { "HOME" => "/" })
 end
 
 def update_domain(domain : String) : Nil
-	puts "domain to reload: #{domain}"
+	BrainlessLog.important "domain to reload: #{domain}"
 	copy_domain_files domain
 	pdns_reload domain
 end
 
 def pdns_add(domain : String) : Nil
-	puts "adding a new domain: pdns_control bind-add-zone #{Context.powerdns_dir}/#{domain}"
+	BrainlessLog.important "adding a new domain: pdns_control bind-add-zone #{Context.powerdns_dir}/#{domain}"
 	run_process("pdns_control",
 			[ "bind-add-zone", domain, "#{Context.powerdns_dir}/#{domain}" ],
 			{ "HOME" => "/" })
 end
 
 def add_domain(domain : String) : Nil
-	puts "domain to add: #{domain}"
+	BrainlessLog.important "domain to add: #{domain}"
 	copy_domain_files domain
 	pdns_add domain
 end
@@ -56,11 +90,11 @@ end
 def delete_file(path : String)
 	File.delete path
 rescue e : File::AccessDeniedError
-	puts "You don't have enough rights: #{e}"
+	BrainlessLog.important "You don't have enough rights: #{e}"
 end
 
 def del_domain(domain : String) : Nil
-	puts "domain to delete: #{domain}"
+	BrainlessLog.important "domain to delete: #{domain}"
 	delete_file "#{Context.powerdns_dir}/#{domain}"
 	# TODO: pdns_control ???
 end
@@ -77,18 +111,18 @@ both.each do |d|
 	i2 = File.info "#{Context.powerdns_dir}/#{d}"
 
 	if i1.modification_time > i2.modification_time
-		puts "has been modified: #{d}"
 		# Wait for a few minutes before changing anything, to avoid useless reloads.
-		if Time.local > i1.modification_time.shift minutes: 5
-			puts "file was modified more than 5 minutes ago"
+		if Time.local > i1.modification_time.shift minutes: duration
+			BrainlessLog.important "#{d}: updating"
 			update_domain d
 		else
-			puts "file has been modified less than 5 minutes ago: do not update yet"
+			BrainlessLog.unimportant "#{d}: has been modified less than #{duration} minute ago, do not update yet"
 		end
 	else
-		puts "hasn't been modified: #{d}"
+		BrainlessLog.unimportant "#{d}: hasn't been modified"
 	end
 end
+BrainlessLog.flush
 
 to_add = dnsmanagerd_dir_content - powerdns_dir_content
 to_add.each { |d| add_domain d }