diff --git a/scripts/lua/modules/timeseries/custom/ts_5min_custom.lua.sample b/scripts/lua/modules/timeseries/custom/ts_5min_custom.lua.sample
new file mode 100644
index 0000000000..630903e304
--- /dev/null
+++ b/scripts/lua/modules/timeseries/custom/ts_5min_custom.lua.sample
@@ -0,0 +1,33 @@
+--
+-- (C) 2019 - ntop.org
+--
+
+local ts_utils = require "ts_utils_core"
+
+local ts_custom = {}
+
+local function setup()
+   -- SCHEMAS MUST BE ADDED IN THIS FUNCTION
+   --
+   -- This is an example of a 5 minute (300 sec) counter
+   --
+   local schema
+   
+   schema = ts_utils.newSchema("host:traffic_total", {step = 300})
+   schema:addTag("ifid")
+   schema:addTag("host")
+   schema:addMetric("bytes")
+end
+
+function ts_custom.host_update_stats(when, hostname, host, ifstats, verbose)
+   -- THIS IS THE FUNCTION THAT IS CALLED EVERY 5 MINUTES BY NTOPNG
+   -- USE THIS TO append() TO THE TIMESERIES
+
+   ts_utils.append("host:traffic_total",
+		   {ifid = ifstats.id, host = hostname,
+		    bytes = host["bytes.sent"] + host["bytes.rcvd"]},
+		   when, verbose)
+end
+
+setup()
+return ts_custom
diff --git a/scripts/lua/modules/timeseries/custom/ts_minute_custom.lua.sample b/scripts/lua/modules/timeseries/custom/ts_minute_custom.lua.sample
new file mode 100644
index 0000000000..cce62d88a4
--- /dev/null
+++ b/scripts/lua/modules/timeseries/custom/ts_minute_custom.lua.sample
@@ -0,0 +1,34 @@
+--
+-- (C) 2019 - ntop.org
+--
+
+local ts_utils = require "ts_utils_core"
+
+local ts_custom = {}
+
+local function setup()
+   -- SCHEMAS MUST BE ADDED IN THIS FUNCTION
+   --
+   -- This is an example of a minute (60 sec) counter
+   --
+   local schema
+   
+   schema = ts_utils.newSchema("iface:tcp_seq_errors", {step = 60})
+   schema:addTag("ifid")
+   schema:addMetric("packets")
+end
+
+function ts_custom.iface_update_stats(when, _ifname, ifstats, verbose)
+   -- THIS IS THE FUNCTION THAT IS CALLED EVERY MINUTE BY NTOPNG
+   -- USE THIS TO append() TO THE TIMESERIES
+
+   ts_utils.append("iface:tcp_seq_errors",
+		   {ifid = ifstats.id,
+		    packets = ifstats.tcpPacketStats.retransmissions
+		       + ifstats.tcpPacketStats.out_of_order
+		       + ifstats.tcpPacketStats.lost},
+		   when, verbose)
+end
+
+setup()
+return ts_custom
diff --git a/scripts/lua/modules/ts_5min_dump_utils.lua b/scripts/lua/modules/ts_5min_dump_utils.lua
index 14407ecbd9..2fb623545c 100644
--- a/scripts/lua/modules/ts_5min_dump_utils.lua
+++ b/scripts/lua/modules/ts_5min_dump_utils.lua
@@ -10,6 +10,12 @@ require "ntop_utils"
 require "check_redis_prefs"
 local ts_utils = require "ts_utils_core"
 
+local ts_custom
+if ntop.exists(dirs.installdir .. "/scripts/lua/modules/timeseries/custom/ts_5min_custom.lua") then
+    package.path = dirs.installdir .. "/scripts/lua/modules/timeseries/custom/?.lua;" .. package.path
+    ts_custom = require "ts_5min_custom"
+end
+
 -- Set to true to debug host timeseries points timestamps
 local enable_debug = false
 
@@ -555,6 +561,11 @@ function ts_dump.host_update_stats_rrds(when, hostname, host, ifstats, verbose)
         bytes_sent_unicast = host["udpBytesSent.unicast"],
         bytes_sent_non_uni = host["udpBytesSent.non_unicast"]
     }, when)
+
+    -- create custom rrds
+    if ts_custom and ts_custom.host_update_stats then
+        ts_custom.host_update_stats(when, hostname, host, ifstats, verbose)
+    end
 end
 
 function ts_dump.host_update_ndpi_rrds(when, hostname, host, ifstats, verbose, config)
diff --git a/scripts/lua/modules/ts_min_dump_utils.lua b/scripts/lua/modules/ts_min_dump_utils.lua
index fe8f841bba..c61eaceb2d 100644
--- a/scripts/lua/modules/ts_min_dump_utils.lua
+++ b/scripts/lua/modules/ts_min_dump_utils.lua
@@ -12,6 +12,13 @@ require "ntop_utils"
 require "ts_minute"
 require "check_redis_prefs"
 local ts_utils = require("ts_utils_core")
+
+local ts_custom
+if ntop.exists(dirs.installdir .. "/scripts/lua/modules/timeseries/custom/ts_5min_custom.lua") then
+    package.path = dirs.installdir .. "/scripts/lua/modules/timeseries/custom/?.lua;" .. package.path
+    ts_custom = require "ts_5min_custom"
+end
+
 local ts_dump = {}
 
 -- ########################################################
@@ -586,6 +593,11 @@ function ts_dump.run_min_dump(_ifname, ifstats, when, verbose)
         ts_dump.iface_update_ndpi_rrds(when, _ifname, ifstats, verbose, config)
     end
 
+    -- create custom rrds
+    if ts_custom and ts_custom.iface_update_stats then
+        ts_custom.iface_update_stats(when, _ifname, ifstats, verbose)
+    end
+
     if config.interface_ndpi_timeseries_creation == "per_category" or config.interface_ndpi_timeseries_creation ==
         "both" then
         ts_dump.iface_update_categories_rrds(when, _ifname, ifstats, verbose)