diff --git a/.gitmodules b/.gitmodules
index 11034c7d2..69988365b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "litex/soc/cores/cpu/picorv32/verilog"]
 	path = litex/soc/cores/cpu/picorv32/verilog
 	url = https://github.com/cliffordwolf/picorv32
+[submodule "litex/build/sim/core/modules/ethernet/tapcfg"]
+	path = litex/build/sim/core/modules/ethernet/tapcfg
+	url = https://github.com/nizox/tapcfg
diff --git a/litex/build/sim/core/modules/ethernet/tapcfg b/litex/build/sim/core/modules/ethernet/tapcfg
new file mode 160000
index 000000000..4ce399dee
--- /dev/null
+++ b/litex/build/sim/core/modules/ethernet/tapcfg
@@ -0,0 +1 @@
+Subproject commit 4ce399deedc42a44f2854b29f8d34ebbd5d45872