Merged in anastmag/scapy_issue-5095/issue5095 (pull request #61)

Fixed issue #5095

scapy/sendrecv.py

@@ -219,9 +219,9 @@ def __gen_send(s, x, inter=0, loop=0, count=None, verbose=None, realtime=None, *
         loop = -count
     elif not loop:
         loop=-1
-    dt0 = None
     try:
         while loop:
+            dt0 = None
             for p in x:
                 if realtime:
                     ct = time.time()