diff --git a/etc/ffdns/local.conf b/etc/ffdns/local.conf
index 929e80f..304eb55 100644
--- a/etc/ffdns/local.conf
+++ b/etc/ffdns/local.conf
@@ -7,6 +7,10 @@ DNSSCRIPT_CONTACT_EMAIL=""
 #DNSSCRIPT_SERVER_NAME="dns.herpf.fff.community"
 DNSSCRIPT_SERVER_NAME=""
 
+### specify the internal local ServerIP used as Source
+### when fetching the other Servers DNSSEC-Entries (IPv6 preferred)
+InternalUpstreamIP=""
+
 ZoneFilesFolder="/etc/bind/fff/"
 TempFolder="/tmp/ffdns/"
 GeneratedIncludeFileFolder="/etc/bind/"
diff --git a/usr/lib/ffdns/dns-functions.sh b/usr/lib/ffdns/dns-functions.sh
index bbad2c6..b8f18fe 100755
--- a/usr/lib/ffdns/dns-functions.sh
+++ b/usr/lib/ffdns/dns-functions.sh
@@ -224,8 +224,11 @@ UpdateDNSSECEntryCache () {
 	ZoneTempFolder="$2"
 	CachedZoneFile="$3"
 	DNSSECKeyFolder="$4"
+	UpstreamIP="$5"
 	UpdateMaster=0
 	
+	[ -z "$UpstreamIP" ] || UpstreamIP="-b ""$UpstreamIP"" "
+	
 	Nameservers="$(GetAllZoneNameservers "$Domain" "$CachedZoneFile")"
 	
 	mkdir -p "$ZoneTempFolder"
@@ -238,7 +241,7 @@ UpdateDNSSECEntryCache () {
 			if [ "$Nameserver" = "$DNSSCRIPT_SERVER_NAME" ]; then
 				DNSKEYS="$( GetOwnKeysForZone "$DNSSECKeyFolder" "$Domain" )"
 			else
-				DNSKEYS="$(delv @"$Nameserver" _dnsseckeys."$Domain" TXT 2>/dev/null | \
+				DNSKEYS="$(delv @"$Nameserver" "$UpstreamIP"_dnsseckeys."$Domain" TXT 2>/dev/null | \
 					sed -ne '/^;/d;s/^.*\sIN\s\+TXT\s\+"\(.*\)"$/'"$Domain"'.\tIN DNSKEY\t\1/p' | \
 					NormalizeZoneFileFormatting )"
 			fi
@@ -255,7 +258,7 @@ UpdateDNSSECEntryCache () {
 	ChildServers="$( sed -ne '/^\s*\(@\|'"$SEDDomain"'\.\)\s/!s/^\s*\(\S\+\)\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Nn][Ss]\s\+\(\S\+\);\?.*$/\1#\3/p' "$CachedZoneFile" | \
 		sed -e 's/\([^.]\)$/\1\.'"$Domain"'\./g;s/\.$//g;s/\([^.]\)#/\1\.'"$Domain"'\.#/g;s/\.#/#/g' )"
 	for ChildServer in $ChildServers; do
-		DNSKEYS="$(delv @"${ChildServer##*\#}" "${ChildServer%%\#*}" CDS 2>/dev/null | \
+		DNSKEYS="$(delv @"${ChildServer##*\#}" "$UpstreamIP""${ChildServer%%\#*}" CDS 2>/dev/null | \
 			sed -ne '/^;/d;s/^.*\sIN\s\+CDS\s\+\(.*\)$/'"${ChildServer%%\#*}"'.\tIN DS\t\1/p' | \
 			NormalizeZoneFileFormatting )"
 		
diff --git a/usr/lib/ffdns/update-dns-functions.sh b/usr/lib/ffdns/update-dns-functions.sh
index c64deb8..2ae037a 100755
--- a/usr/lib/ffdns/update-dns-functions.sh
+++ b/usr/lib/ffdns/update-dns-functions.sh
@@ -43,7 +43,7 @@ UpdateMasterZone() {
 	if [ -n "$ServeMasterZone" ]; then
 		ZoneTempFolder="$TempFolder""cache/""$MasterDomain""/"
 	
-		UpdateMaster="$(UpdateDNSSECEntryCache "$MasterDomain" "$ZoneTempFolder" "$CachedMasterFile" "$DNSSECKeyFolder")"
+		UpdateMaster="$(UpdateDNSSECEntryCache "$MasterDomain" "$ZoneTempFolder" "$CachedMasterFile" "$DNSSECKeyFolder" "$InternalUpstreamIP")"
 		if [ $((PostFetchMasterSerial)) -gt $((PreFetchMasterSerial)) ] || [ $UpdateMaster -ne 0 ] || [ ! -f "$MasterFile" ]; then
 			cp -f "$CachedMasterFile" "$CachedMasterFile""I"
 			for KeyFile in "$ZoneTempFolder"*; do
@@ -95,7 +95,7 @@ UpdateExternal() {
 		
 		sed -i -e 's/^\s*'"$CommunityExternPrefix"'\s/@ /g;/^\s*\(@\|\S\+\.\)\s\+\([0-9]*\s\)\?\s*[Ii][Nn]\s\+[Dd][Ss]\s/d' "$CachedZoneFile"
 		
-		UpdateExternDomain="$(UpdateDNSSECEntryCache "$ExternDomain" "$ZoneTempFolder" "$CachedZoneFile" "$DNSSECKeyFolder")"
+		UpdateExternDomain="$(UpdateDNSSECEntryCache "$ExternDomain" "$ZoneTempFolder" "$CachedZoneFile" "$DNSSECKeyFolder" "$InternalUpstreamIP")"
 		if [ $UpdateExternView -ne 0 ] || [ $UpdateExternDomain -ne 0 ]; then
 			for KeyFile in "$ZoneTempFolder"*; do
 				[ "$KeyFile" = "$ZoneTempFolder""*" ] || \
diff --git a/usr/lib/ffdns/update-dns.sh b/usr/lib/ffdns/update-dns.sh
index ec6253e..bb3b7ce 100755
--- a/usr/lib/ffdns/update-dns.sh
+++ b/usr/lib/ffdns/update-dns.sh
@@ -8,7 +8,7 @@
 # exit script when command fails
 set -e
 
-export DNSSCRIPT_VERSION="0.9.1"
+export DNSSCRIPT_VERSION="0.9.2"
 
 . /etc/ffdns/community.conf
 . /etc/ffdns/local.conf