diff --git a/boards/uniboard2c/designs/unb2c_test/src/vhdl/unb2c_test.vhd b/boards/uniboard2c/designs/unb2c_test/src/vhdl/unb2c_test.vhd
index f584a6c375feb7ab4694d7e6fb1af511a3083148..6016c8f8e49bdbd148cd9f0842d16d1bb083ca7f 100644
--- a/boards/uniboard2c/designs/unb2c_test/src/vhdl/unb2c_test.vhd
+++ b/boards/uniboard2c/designs/unb2c_test/src/vhdl/unb2c_test.vhd
@@ -914,7 +914,7 @@ BEGIN
     GENERIC MAP (
       g_technology   => g_technology,
       g_rx_udp_port  => TO_UINT(c_eth_rx_udp_port),  -- = 0x1771 = 6001
-      g_jumbo_en     => FALSE,
+      g_jumbo_en     => TRUE,
       g_sim          => g_sim,
       g_sim_level    => 1   -- 0 = use IP model (equivalent to g_sim = FALSE); 1 = use fast serdes model;
     )
diff --git a/libraries/io/eth/src/vhdl/eth_stream.vhd b/libraries/io/eth/src/vhdl/eth_stream.vhd
index 748064fb4c5acceceb76836ef7045f3775287557..848ed7e23f3e4e6d3c222f67b820c6e6345d805d 100644
--- a/libraries/io/eth/src/vhdl/eth_stream.vhd
+++ b/libraries/io/eth/src/vhdl/eth_stream.vhd
@@ -53,7 +53,7 @@ ENTITY eth_stream IS
     g_technology   : NATURAL := c_tech_select_default;
     g_ETH_PHY      : STRING  := "LVDS"; -- "LVDS" (default): uses LVDS IOs for ctrl_unb_common, "XCVR": uses tranceiver PHY
     g_rx_udp_port  : NATURAL := TO_UINT(c_eth_rx_udp_port);
-    g_jumbo_en     : BOOLEAN := FALSE;
+    g_jumbo_en     : BOOLEAN := TRUE;
     g_sim          : BOOLEAN := FALSE;
     g_sim_level    : NATURAL := 0   -- 0 = use IP model (equivalent to g_sim = FALSE); 1 = use fast serdes model;
   );
diff --git a/libraries/technology/tse/tech_tse_setup.vhd b/libraries/technology/tse/tech_tse_setup.vhd
index fc02da2dc47117ca8647e27f75e60cd68577433b..f3b4fd0d8d5b6f84c7b73a0f160b9921011d057d 100644
--- a/libraries/technology/tse/tech_tse_setup.vhd
+++ b/libraries/technology/tse/tech_tse_setup.vhd
@@ -39,7 +39,7 @@ ENTITY tech_tse_setup IS
     -- = FALSE for frame_len <= 1500 octets. If frame is longer then this
     -- yields invalid length flag in rx_sosi.err, but data is still received.
     -- Use g_jumbo_en = TRUE for frame_len <= 9000 octets (jumbo frames).
-    g_jumbo_en : BOOLEAN := FALSE
+    g_jumbo_en : BOOLEAN := TRUE
   );
   PORT (
     -- Clocks and reset