diff --git a/doc/erko_howto_tools.txt b/doc/erko_howto_tools.txt
index 3e7f7265908b4ecf9b7978956102a86cde97f643..07d607b3aa9fdbf30d1f6d883d537e95ac7056ff 100755
--- a/doc/erko_howto_tools.txt
+++ b/doc/erko_howto_tools.txt
@@ -409,6 +409,21 @@ node 15:  2023-09-02T18.27.22_e3ec2b2bb_lofar2_unb2c_sdp_station_full
 
 This is the image with time transposed order of beamlets data to CEP (L2SDP-961).
 
+
+Alternative way is to map localhost port 4840 to LCU2 port 4840:
+
+:kooistra@dop466:/dop466_0/kooistra/hdl_build_results/20230415$ ssh portal.lofar.eu
+yes (accept fingerprint)
+:kooistra@dop466:/dop466_0/kooistra/hdl_build_results/20230415$ ssh -v -L 4840:cs001c.control.lofar:4840 -N portal.lofar.eu
+
+# and then ctrl-z, bg or then do SDP commands from another terminal via localhost, e.g.
+sdp_rw.py --host localhost --port 4840 -r firmware_version
+
+
+From ASTRON l2TS can be reached directly, because LCU2 is in ASTRON network:
+
+sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+
 *******************************************************************************
 * RadioHDL with SVN
 *******************************************************************************
diff --git a/doc/sdp_useful_commands_erko.txt b/doc/sdp_useful_commands_erko.txt
index 33d4933132d43eb811f464839530bf26ce21aadd..750e41a7deea62e25bff572d5b712094bca5562e 100644
--- a/doc/sdp_useful_commands_erko.txt
+++ b/doc/sdp_useful_commands_erko.txt
@@ -516,3 +516,29 @@ node  0:  2022-11-21T11.15.47_193f87e53_lofar2_unb2c_sdp_station_full
 node  1:  2022-11-21T11.15.47_193f87e53_lofar2_unb2c_sdp_station_full
 node  2:
 node  3:  2022-11-21T11.15.47_193f87e53_lofar2_unb2c_sdp_station_full
+
+
+11) L2TS sep 2023
+
+# LBA - 4840
+# HBA0 - 4842
+# HBA1 - 4844
+sdp_rw.py --host 10.151.255.1 --port 4842 -r firmware_version
+sdp_rw.py --host 10.151.255.1 --port 4842 -r jesd204b_rx_err0
+sdp_rw.py --host 10.151.255.1 --port 4842 -r jesd204b_rx_err1
+sdp_rw.py --host 10.151.255.1 --port 4842 -r jesd204b_csr_dev_syncn
+sdp_rw.py --host 10.151.255.1 --port 4842 -r jesd204b_csr_rbd_count
+sdp_rw.py --host 10.151.255.1 --port 4842 -r signal_input_bsn
+sdp_rw.py --host 10.151.255.1 --port 4842 -r signal_input_mean
+sdp_rw.py --host 10.151.255.1 --port 4842 -r signal_input_std
+sdp_rw.py --host 10.151.255.1 --port 4842 -r signal_input_samples_delay
+sdp_rw.py --host 10.151.255.1 --port 4842 -r signal_input_data_buffer
+
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_integration_interval
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_bsn
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_aligned_bsn
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_latency
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_total_nof_packets_discarded
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_total_nof_packets_received
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_total_nof_sync_discarded
+sdp_rw.py --host 10.151.255.1 --port 4842 -r xst_ring_rx_total_nof_sync_received