Index: /trunk/src/VBox/Devices/Network/DevPCNet.cpp
===================================================================
--- /trunk/src/VBox/Devices/Network/DevPCNet.cpp	(revision 78477)
+++ /trunk/src/VBox/Devices/Network/DevPCNet.cpp	(revision 78478)
@@ -1623,4 +1623,9 @@
 {
     Log(("#%d pcnetStart:\n", PCNET_INST_NR));
+
+    /* Reset any cached RX/TX descriptor state. */
+    CSR_CRDA(pThis) = CSR_CRBA(pThis) = CSR_NRDA(pThis) = CSR_NRBA(pThis) = 0;
+    CSR_CRBC(pThis) = CSR_NRBC(pThis) = CSR_CRST(pThis) = 0;
+
     if (!CSR_DTX(pThis))
         pThis->aCSR[0] |= 0x0010;    /* set TXON */