diff --git a/applications/lofar2/designs/lofar2_unb2b_beamformer/src/vhdl/lofar2_unb2b_beamformer.vhd b/applications/lofar2/designs/lofar2_unb2b_beamformer/src/vhdl/lofar2_unb2b_beamformer.vhd
index 00f3c7f77902d0396c647efcc8e936c4eeeec3e6..713a076bafdea9b2bc0346797ea45a4e1551446c 100644
--- a/applications/lofar2/designs/lofar2_unb2b_beamformer/src/vhdl/lofar2_unb2b_beamformer.vhd
+++ b/applications/lofar2/designs/lofar2_unb2b_beamformer/src/vhdl/lofar2_unb2b_beamformer.vhd
@@ -757,9 +757,9 @@ BEGIN
   -- derive MAC, IP and UDP Port from ID
   id_backplane <= RESIZE_UVEC(ID(c_sdp_W_gn_id-1 DOWNTO 2), c_byte_w);
   id_eth       <= RESIZE_UVEC(ID(1 DOWNTO 0) & TO_UVEC(0, 2), c_byte_w);  
-  eth_src_mac <= x"00228608" & id_backplane & INCR_UVEC(id_eth, 0); -- Interface id = 0
-  ip_src_addr <= x"C0A8" & id_backplane & INCR_UVEC(id_eth, 1);     -- Interface id = 0
-  udp_src_port <= x"D0" & ID;
+  eth_src_mac  <= c_sdp_cep_eth_src_mac_47_16 & id_backplane & INCR_UVEC(id_eth, 0); -- Interface id = 0
+  ip_src_addr  <= c_sdp_cep_ip_src_addr_31_16 & id_backplane & INCR_UVEC(id_eth, 1);     -- Interface id = 0
+  udp_src_port <= c_sdp_cep_udp_src_port_15_8 & ID;
 
   -- Beamformers
   gen_bf : FOR beamset_id IN 0 TO c_sdp_N_beamsets-1 GENERATE
diff --git a/applications/lofar2/libraries/sdp/src/vhdl/sdp_beamformer_output.vhd b/applications/lofar2/libraries/sdp/src/vhdl/sdp_beamformer_output.vhd
index 34652ab6913ec7f30af4538f59f3c8e142464ccd..025eed1369793e16dee78c209f41eb8fb9758064 100644
--- a/applications/lofar2/libraries/sdp/src/vhdl/sdp_beamformer_output.vhd
+++ b/applications/lofar2/libraries/sdp/src/vhdl/sdp_beamformer_output.vhd
@@ -76,6 +76,9 @@ ARCHITECTURE str OF sdp_beamformer_output IS
 
   CONSTANT c_data_w                 : NATURAL := c_nof_complex*c_sdp_W_beamlet; --16b
   CONSTANT c_beamlet_id             : NATURAL := g_beamset_id * c_sdp_S_sub_bf;
+
+  -- c_fifo_fill must be the exact size of a packet such that no packet gets stuck in the FIFO or the FIFO gets read out too soon.
+  -- For packets of variable length, dp_fifo_fill_eop must be used. In this case we can use the standard fill fifo.
   CONSTANT c_fifo_fill              : NATURAL := c_sdp_cep_nof_blocks_per_packet * c_sdp_cep_nof_beamlets_per_block / 4; -- Size of packet: 4 beamlets fit in 1 64bit longword 
   CONSTANT c_fifo_size              : NATURAL := c_fifo_fill*2; -- Make fifo size large enough for adding header and muxing beamsets.
  
diff --git a/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd b/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
index f62cfa0e4480fb2d312ee6818b9baa181a4ee04d..2668b93b27041cb0af04bc4e7c717d0028f6279d 100644
--- a/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
+++ b/applications/lofar2/libraries/sdp/src/vhdl/sdp_pkg.vhd
@@ -143,7 +143,11 @@ PACKAGE sdp_pkg is
   CONSTANT c_sdp_reg_dp_xonoff_addr_w       : NATURAL := ceil_log2(c_sdp_N_beamsets) + 1;
   CONSTANT c_sdp_ram_st_bst_addr_w          : NATURAL := ceil_log2(c_sdp_N_beamsets) + ceil_log2(c_sdp_S_sub_bf*c_sdp_N_pol*(c_longword_sz/c_word_sz));
 
-  -- 10GbE offload
+  -- 10GbE offload (cep = central processor)
+  CONSTANT c_sdp_cep_eth_src_mac_47_16 : STD_LOGIC_VECTOR(31 DOWNTO 0) := x"00228608";  -- 47:16, 15:8 = backplane, 7:0 = node
+  CONSTANT c_sdp_cep_ip_src_addr_31_16 : STD_LOGIC_VECTOR(15 DOWNTO 0) := x"C0A8";      -- 31:16, 15:8 = backplane, 7:0 = node + 1 = 192.168.xx.yy
+  CONSTANT c_sdp_cep_udp_src_port_15_8 : STD_LOGIC_VECTOR(7 DOWNTO 0)  := x"D0";        -- 15:8, 7:0 = gn_id (= ID[7:0] = backplane[5:0] & node[1:0])
+
   CONSTANT c_sdp_cep_nof_blocks_per_packet  : NATURAL := 4;
   CONSTANT c_sdp_cep_nof_beamlets_per_block : NATURAL := c_sdp_N_pol * c_sdp_S_sub_bf; 
   CONSTANT c_sdp_cep_nof_hdr_fields : NATURAL := 3+12+4+18+1; -- 592b; 9.25 64b words
diff --git a/libraries/base/dp/tb/vhdl/tb_dp_xonoff.vhd b/libraries/base/dp/tb/vhdl/tb_dp_xonoff.vhd
index 2b2f4c0b71fcaf11fde263baa4781262131a1905..b84e35a07c23a3a4c48d95ecd22b51c2b2e00254 100644
--- a/libraries/base/dp/tb/vhdl/tb_dp_xonoff.vhd
+++ b/libraries/base/dp/tb/vhdl/tb_dp_xonoff.vhd
@@ -252,8 +252,8 @@ BEGIN
   exp_size <= g_pkt_len;
   
   proc_dp_verify_block_size(exp_size, clk, verify_snk_in.valid, verify_snk_in.sop, verify_snk_in.eop, cnt_size);
-  
-  -- Verify output ready latency
+ 
+  -- Verify output ready latency between dut siso ready and sink in valid.
   proc_dp_verify_valid(clk, verify_en_valid, stimuli_src_in.ready, prev_verify_snk_out.ready, verify_snk_in.valid);
   
   p_verify_xonoff : PROCESS