--- a/package/network/services/ppp/Makefile
+++ b/package/network/services/ppp/Makefile
@@ -39,7 +39,7 @@ endef
 
 define Package/ppp
 $(call Package/ppp/Default)
-  DEPENDS:=+kmod-ppp
+  DEPENDS:=+kmod-ppp +libpthread +shellsync +kmod-mppe
   TITLE:=PPP daemon
   VARIANT:=default
 endef

--- a/package/network/services/ppp/files/ppp.sh
+++ b/package/network/services/ppp/files/ppp.sh
@@ -233,7 +233,15 @@ proto_pppoe_setup() {
 	json_get_var padi_attempts padi_attempts
 	json_get_var padi_timeout padi_timeout
 
+	syncppp_option=""
+	[ "$(uci get syncdial.config.enabled)" -eq "1" ] && {
+		ppp_if_cnt=$(uci show network | grep -c "\.proto=\'pppoe\'$")
+		syncppp_option="syncppp $ppp_if_cnt"
+		shellsync $ppp_if_cnt 10
+	}
+
 	ppp_generic_setup "$config" \
+		$syncppp_option \
 		plugin rp-pppoe.so \
 		${ac:+rp_pppoe_ac "$ac"} \
 		${service:+rp_pppoe_service "$service"} \