Index: /trunk/include/VBox/pdmnetinline.h
===================================================================
--- /trunk/include/VBox/pdmnetinline.h	(revision 31274)
+++ /trunk/include/VBox/pdmnetinline.h	(revision 31275)
@@ -196,8 +196,7 @@
             pUdpHdr->uh_sum = RTNetUDPChecksum(u32PseudoSum, pUdpHdr);
             break;
-        /** @todo: Implement:
         case PDMNETCSUMTYPE_PSEUDO:
-            pUdpHdr->uh_sum = ???;
-            break; */
+            pUdpHdr->uh_sum = ~RTNetIPv4FinalizeChecksum(u32PseudoSum);
+            break;
         default:
             AssertFailed();