diff --git a/doc/plan.org b/doc/plan.org
index b2756a2..345afa8 100644
--- a/doc/plan.org
+++ b/doc/plan.org
@@ -8867,6 +8867,7 @@ nico@ESPRIMO-P956:~/master-thesis/bin$
 **** DONE MAXIMUM payload size: 215 0s + 42 + \n = 219 bytes payload
      CLOSED: [2019-08-04 Sun 13:43]
 ****
+*** TODO 2019-08-04: retesting with simulation while compiling
 ** The NetPFGA saga
 Problems encountered:
 - The logfile for a compile run is 10k+ lines
diff --git a/netpfga/minip4/testdata/gen_testdata_nat64_500byte.py b/netpfga/minip4/testdata/gen_testdata_nat64_500byte.py
index 4457ad0..96f42e1 100755
--- a/netpfga/minip4/testdata/gen_testdata_nat64_500byte.py
+++ b/netpfga/minip4/testdata/gen_testdata_nat64_500byte.py
@@ -134,7 +134,7 @@ def test_nat64():
     pkg6 = e6 / i6 / u6 / p6
 
     e4 = e6
-    i4 = IP(dst = "10.0.0.42", src = "10.0.0.66")
+    i4 = IP(dst = "10.0.0.42", src = "10.0.0.66", id=0)
     u4 = u6
     p4 = p6
     pkg4 = e4 / i4 / u4 / p4