the TAP IP was the same as the microtcp instance, which wasn't right. Now the TAP is at 10.0.0.5 and the TCP at 10.0.0.4; fixed some bugs in the TCP state machine and made it so it always ACKs; fixed TCP checksum calculation

misc/serv.py

@@ -0,0 +1,15 @@
+
+from http.server import BaseHTTPRequestHandler, HTTPServer
+
+class RequestHandler(BaseHTTPRequestHandler):
+    
+    def do_GET(self):
+        self.send_response(200)
+        self.send_header('Content-type','text/html')
+        self.end_headers()
+        message = "Hello world!"
+        self.wfile.write(bytes(message, "utf8"))
+        return
+
+addr = ('127.0.0.1', 8080)
+HTTPServer(addr, RequestHandler).serve_forever()