diff --git a/trunk/research/msg_zerocopy/client.cpp b/trunk/research/msg_zerocopy/client.cpp
index c30f3584d..d3b501171 100644
--- a/trunk/research/msg_zerocopy/client.cpp
+++ b/trunk/research/msg_zerocopy/client.cpp
@@ -28,8 +28,8 @@ int main(int argc, char** argv)
     sockaddr_in peer;
     memset(&peer, 0, sizeof(sockaddr_in));
 
-    int port = 8000;
-    const char* host = "127.0.0.1";
+    int port = atoi(argv[2]);
+    char* host = argv[1];
     peer.sin_family = AF_INET;
     peer.sin_port = htons(port);
     peer.sin_addr.s_addr = inet_addr(host);
@@ -54,7 +54,7 @@ int main(int argc, char** argv)
 
     r0 = st_recvmsg(stfd, &msg, 0, ST_UTIME_NO_TIMEOUT);
     assert(r0 > 0);
-    printf("From %s:%d %d bytes, flags %#x, %s\n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port), r0,
+    printf("Pong %s:%d %d bytes, flags %#x, %s\n", inet_ntoa(peer.sin_addr), ntohs(peer.sin_port), r0,
         msg.msg_flags, msg.msg_iov->iov_base);
 
     return 0;
diff --git a/trunk/research/msg_zerocopy/server.cpp b/trunk/research/msg_zerocopy/server.cpp
index cc1259680..0b1145fa3 100644
--- a/trunk/research/msg_zerocopy/server.cpp
+++ b/trunk/research/msg_zerocopy/server.cpp
@@ -29,10 +29,11 @@ int main(int argc, char** argv)
     sockaddr_in addr;
     memset(&addr, 0, sizeof(sockaddr_in));
 
-    int port = 8000;
+    int port = atoi(argv[2]);
+    char* host = argv[1];
     addr.sin_family = AF_INET;
     addr.sin_port = htons(port);
-    addr.sin_addr.s_addr = inet_addr("0.0.0.0");
+    addr.sin_addr.s_addr = inet_addr(host);
 
     r0 = bind(fd, (sockaddr *)&addr, sizeof(sockaddr_in));
     assert(!r0);
@@ -40,7 +41,7 @@ int main(int argc, char** argv)
     st_netfd_t stfd = st_netfd_open_socket(fd);
     assert(stfd);
 
-    printf("Listen at udp://%d\n", port);
+    printf("Listen at udp://%s:%d\n", host, port);
 
     msghdr msg;
     memset(&msg, 0, sizeof(msghdr));