diff --git a/automated install/basic-install.sh b/automated install/basic-install.sh
index ac57db43..c20308ab 100755
--- a/automated install/basic-install.sh	
+++ b/automated install/basic-install.sh	
@@ -117,18 +117,20 @@ welcomeDialogs() {
 
 
 verifyFreeDiskSpace() {
-    # 25MB is the minimum space needed (20MB install + 5MB one day of logs.)
-    requiredFreeBytes=25600
-
-    existingFreeBytes=`df -lk / 2>&1 | awk '{print $4}' | head -2 | tail -1`
-    if ! [[ "$existingFreeBytes" =~ ^[0-9]\+$ ]]; then
-        existingFreeBytes=`df -lk /dev 2>&1 | awk '{print $4}' | head -2 | tail -1`
-    fi
-
-    if [[ $existingFreeBytes -lt $requiredFreeBytes ]]; then
-        whiptail --msgbox --backtitle "Insufficient Disk Space" --title "Insufficient Disk Space" "\nYour system appears to be low on disk space. pi-hole recomends a minimum of $requiredFreeBytes Bytes.\nYou only have $existingFreeBytes Free.\n\nIf this is a new install you may need to expand your disk.\n\nTry running:\n    'sudo raspi-config'\nChoose the 'expand file system option'\n\nAfter rebooting, run this installation again.\n\ncurl -L install.pi-hole.net | bash\n" $r $c
-        exit 1
-    fi
+	# 25MB is the minimum space needed (20MB install + 5MB one day of logs.)
+	requiredFreeBytes=25600
+	
+	existingFreeBytes=`df -lk / 2>&1 | awk '{print $4}' | head -2 | tail -1`    	
+	if ! [[ "$existingFreeBytes" =~ ^([0-9])+$ ]]; then       
+		existingFreeBytes=`df -lk /dev 2>&1 | awk '{print $4}' | head -2 | tail -1`		
+	fi
+	
+	if [[ $existingFreeBytes -lt $requiredFreeBytes ]]; then
+		whiptail --msgbox --backtitle "Insufficient Disk Space" --title "Insufficient Disk Space" "\nYour system appears to be low on disk space. pi-hole recomends a minimum of $requiredFreeBytes Bytes.\nYou only have $existingFreeBytes Free.\n\nIf this is a new install you may need to expand your disk.\n\nTry running:\n    'sudo raspi-config'\nChoose the 'expand file system option'\n\nAfter rebooting, run this installation again.\n\ncurl -L install.pi-hole.net | bash\n" $r $c
+		echo "$existingFreeBytes is less than $requiredFreeBytes"
+		echo "Insufficient free space, exiting..."
+		exit 1
+	fi
 }
 
 
@@ -302,10 +304,31 @@ setStaticIPv4() {
 	fi
 }
 
+function valid_ip()
+{
+	local  ip=$1
+	local  stat=1
+	
+	if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+		OIFS=$IFS
+		IFS='.'
+		ip=($ip)
+		IFS=$OIFS
+		[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
+		&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
+		stat=$?
+	fi
+	return $stat
+}
+
 setDNS(){
-	DNSChoseCmd=(whiptail --separate-output --radiolist "Select Upstream DNS Provider" $r $c 2)
+	DNSChoseCmd=(whiptail --separate-output --radiolist "Select Upstream DNS Provider. To use your own, select Custom." $r $c 6)
 	DNSChooseOptions=(Google "" on
-					  OpenDNS "" off)
+					  OpenDNS "" off
+					  Level3 "" off
+					  Norton "" off
+					  Comodo "" off
+					  Custom "" off)
 	DNSchoices=$("${DNSChoseCmd[@]}" "${DNSChooseOptions[@]}" 2>&1 >/dev/tty)
 	if [[ $? = 0 ]];then
 		case $DNSchoices in
@@ -319,6 +342,79 @@ setDNS(){
 				piholeDNS1="208.67.222.222"
 				piholeDNS2="208.67.220.220"
 				;;
+			Level3)
+				echo "::: Using Level3 servers."
+				piholeDNS1="4.2.2.1"
+				piholeDNS2="4.2.2.2"
+				;;
+			Norton)
+				echo "::: Using Norton ConnectSafe servers."
+				piholeDNS1="199.85.126.10"
+				piholeDNS2="199.85.127.10"
+				;;
+			Comodo)
+				echo "::: Using Comodo Secure servers."
+				piholeDNS1="8.26.56.26"
+				piholeDNS2="8.20.247.20"
+				;;
+			Custom)
+				until [[ $DNSSettingsCorrect = True ]]
+				do
+					
+					strInvalid="Invalid"
+				
+					if [ ! $piholeDNS1 ]; then
+						if [ ! $piholeDNS2 ]; then
+							prePopulate=""
+						else
+							prePopulate=", $piholeDNS2"
+						fi
+					elif  [ $piholeDNS1 ] && [ ! $piholeDNS2 ]; then
+						prePopulate="$piholeDNS1"
+					elif [ $piholeDNS1 ] && [ $piholeDNS2 ]; then
+						prePopulate="$piholeDNS1, $piholeDNS2"
+					fi
+					
+					piholeDNS=$(whiptail --backtitle "Specify Upstream DNS Provider(s)"  --inputbox "Enter your desired upstream DNS provider(s), seperated by a comma.\n\nFor example '8.8.8.8, 8.8.4.4'" $r $c "$prePopulate" 3>&1 1>&2 2>&3)
+					if [[ $? = 0 ]];then
+						piholeDNS1=$(echo $piholeDNS | sed 's/[, \t]\+/,/g' | awk -F, '{print$1}')
+						piholeDNS2=$(echo $piholeDNS | sed 's/[, \t]\+/,/g' | awk -F, '{print$2}')
+						
+						if ! valid_ip $piholeDNS1 || [ ! $piholeDNS1 ]; then
+							piholeDNS1=$strInvalid
+						fi
+												
+						if ! valid_ip $piholeDNS2 && [ $piholeDNS2 ]; then
+							piholeDNS2=$strInvalid
+						fi
+						
+					else
+						echo "::: Cancel selected, exiting...."
+						exit 1
+					fi
+					
+					if [[ $piholeDNS1 == $strInvalid ]] || [[ $piholeDNS2 == $strInvalid ]]; then
+						whiptail --msgbox --backtitle "Invalid IP" --title "Invalid IP" "One or both entered IP addresses were invalid. Please try again.\n\n    DNS Server 1:   $piholeDNS1\n    DNS Server 2:   $piholeDNS2" $r $c						
+						
+						if [[ $piholeDNS1 == $strInvalid ]]; then
+							piholeDNS1=""
+						fi
+						
+						if [[ $piholeDNS2 == $strInvalid ]]; then
+							piholeDNS2=""
+						fi
+						
+						DNSSettingsCorrect=False
+					else					
+						if (whiptail --backtitle "Specify Upstream DNS Provider(s)" --title "Upstream DNS Provider(s)" --yesno "Are these settings correct?\n    DNS Server 1:   $piholeDNS1\n    DNS Server 2:   $piholeDNS2" $r $c) then
+								DNSSettingsCorrect=True
+						else
+							# If the settings are wrong, the loop continues
+							DNSSettingsCorrect=False
+						fi
+					fi
+				done
+				;;
 		esac
 	else
 		echo "::: Cancel selected. Exiting..."
@@ -359,8 +455,16 @@ versionCheckDNSmasq(){
   $SUDO cp $newFileToInstall $newFileFinalLocation
   echo " done."
   $SUDO sed -i "s/@INT@/$piholeInterface/" $newFileFinalLocation
-  $SUDO sed -i "s/@DNS1@/$piholeDNS1/" $newFileFinalLocation
-  $SUDO sed -i "s/@DNS2@/$piholeDNS2/" $newFileFinalLocation
+  if [[ "$piholeDNS1" != "" ]]; then
+    $SUDO sed -i "s/@DNS1@/$piholeDNS1/" $newFileFinalLocation
+  else
+    $SUDO sed -i '/^server=@DNS1@/d' $newFileFinalLocation
+  fi
+  if [[ "$piholeDNS2" != "" ]]; then
+    $SUDO sed -i "s/@DNS2@/$piholeDNS2/" $newFileFinalLocation
+  else
+    $SUDO sed -i '/^server=@DNS2@/d' $newFileFinalLocation
+  fi
 }
 
 installScripts() {