diff -ruN linux-2.6.13.orig/include/net/ip_vs.h linux-2.6.13/include/net/ip_vs.h
--- linux-2.6.13.orig/include/net/ip_vs.h	2005-09-28 00:49:21.000000000 +0200
+++ linux-2.6.13/include/net/ip_vs.h	2005-09-28 14:39:32.000000000 +0200
@@ -19,6 +19,7 @@
  */
 #define IP_VS_SVC_F_PERSISTENT	0x0001		/* persistent port */
 #define IP_VS_SVC_F_HASHED	0x0002		/* hashed entry */
+#define IP_VS_SVC_F_ONEPACKET	0x0004		/* one-packet scheduling */
 
 /*
  *      Destination Server Flags
@@ -84,6 +85,7 @@
 #define IP_VS_CONN_F_IN_SEQ	0x0400		/* must do input seq adjust */
 #define IP_VS_CONN_F_SEQ_MASK	0x0600		/* in/out sequence mask */
 #define IP_VS_CONN_F_NO_CPORT	0x0800		/* no client port set yet */
+#define IP_VS_CONN_F_ONE_PACKET	0x1000		/* forward only one packet */
 
 /* Move it to better place one day, for now keep it unique */
 #define NFC_IPVS_PROPERTY	0x10000
diff -ruN linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_conn.c linux-2.6.13/net/ipv4/ipvs/ip_vs_conn.c
--- linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_conn.c	2005-09-28 00:49:23.000000000 +0200
+++ linux-2.6.13/net/ipv4/ipvs/ip_vs_conn.c	2005-09-28 02:54:55.000000000 +0200
@@ -127,6 +127,9 @@
 	unsigned hash;
 	int ret;
 
+	if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
+		return 0;
+
 	/* Hash by protocol, client address and port */
 	hash = ip_vs_conn_hashkey(cp->protocol, cp->caddr, cp->cport);
 
@@ -275,6 +278,11 @@
  */
 void ip_vs_conn_put(struct ip_vs_conn *cp)
 {
+	if (cp->flags & IP_VS_CONN_F_ONE_PACKET) {
+		ip_vs_conn_expire_now(cp);
+		return;
+	}
+
 	/* reset it expire in its timeout */
 	mod_timer(&cp->timer, jiffies+cp->timeout);
 
@@ -506,7 +514,7 @@
 	/*
 	 *	unhash it if it is hashed in the conn table
 	 */
-	if (!ip_vs_conn_unhash(cp))
+	if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET))
 		goto expire_later;
 
 	/*
diff -ruN linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_core.c linux-2.6.13/net/ipv4/ipvs/ip_vs_core.c
--- linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_core.c	2005-09-28 00:49:23.000000000 +0200
+++ linux-2.6.13/net/ipv4/ipvs/ip_vs_core.c	2005-09-28 02:54:55.000000000 +0200
@@ -215,6 +215,7 @@
 	struct ip_vs_dest *dest;
 	struct ip_vs_conn *ct;
 	__u16  dport;	 /* destination port to forward */
+	__u16 flags;
 	__u32  snet;	 /* source network of the client, after masking */
 
 	/* Mask saddr with the netmask to adjust template granularity */
@@ -345,6 +346,9 @@
 		dport = ports[1];
 	}
 
+	flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+		 && iph->protocol == IPPROTO_UDP)?
+		IP_VS_CONN_F_ONE_PACKET : 0;
 	/*
 	 *    Create a new connection according to the template
 	 */
@@ -352,7 +356,7 @@
 			    iph->saddr, ports[0],
 			    iph->daddr, ports[1],
 			    dest->addr, dport,
-			    0,
+			    flags,
 			    dest);
 	if (cp == NULL) {
 		ip_vs_conn_put(ct);
@@ -383,6 +387,7 @@
 	struct iphdr *iph = skb->nh.iph;
 	struct ip_vs_dest *dest;
 	__u16 _ports[2], *pptr;
+	__u16 flags;
 
 	pptr = skb_header_pointer(skb, iph->ihl*4,
 				  sizeof(_ports), _ports);
@@ -412,6 +417,9 @@
 		return NULL;
 	}
 
+	flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+		 && iph->protocol == IPPROTO_UDP)?
+		IP_VS_CONN_F_ONE_PACKET : 0;
 	/*
 	 *    Create a connection entry.
 	 */
@@ -419,7 +427,7 @@
 			    iph->saddr, pptr[0],
 			    iph->daddr, pptr[1],
 			    dest->addr, dest->port?dest->port:pptr[1],
-			    0,
+			    flags,
 			    dest);
 	if (cp == NULL)
 		return NULL;
@@ -462,6 +470,9 @@
 	    && (inet_addr_type(iph->daddr) == RTN_UNICAST)) {
 		int ret, cs;
 		struct ip_vs_conn *cp;
+		__u16 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
+				iph->protocol == IPPROTO_UDP)?
+				IP_VS_CONN_F_ONE_PACKET : 0;
 
 		ip_vs_service_put(svc);
 
@@ -471,7 +482,7 @@
 				    iph->saddr, pptr[0],
 				    iph->daddr, pptr[1],
 				    0, 0,
-				    IP_VS_CONN_F_BYPASS,
+				    IP_VS_CONN_F_BYPASS | flags,
 				    NULL);
 		if (cp == NULL)
 			return NF_DROP;
diff -ruN linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_ctl.c linux-2.6.13/net/ipv4/ipvs/ip_vs_ctl.c
--- linux-2.6.13.orig/net/ipv4/ipvs/ip_vs_ctl.c	2005-09-28 00:49:23.000000000 +0200
+++ linux-2.6.13/net/ipv4/ipvs/ip_vs_ctl.c	2005-09-28 14:49:20.000000000 +0200
@@ -1753,14 +1753,18 @@
 		const struct ip_vs_dest *dest;
 
 		if (iter->table == ip_vs_svc_table)
-			seq_printf(seq, "%s  %08X:%04X %s ",
+			seq_printf(seq, "%s  %08X:%04X %s%s ",
 				   ip_vs_proto_name(svc->protocol),
 				   ntohl(svc->addr),
 				   ntohs(svc->port),
-				   svc->scheduler->name);
+				   svc->scheduler->name,
+				   (svc->flags & IP_VS_SVC_F_ONEPACKET)?
+				   " ops":"");
 		else
-			seq_printf(seq, "FWM  %08X %s ",
-				   svc->fwmark, svc->scheduler->name);
+			seq_printf(seq, "FWM  %08X %s%s ",
+				   svc->fwmark, svc->scheduler->name,
+				   (svc->flags & IP_VS_SVC_F_ONEPACKET)?
+				   " ops":"");
 
 		if (svc->flags & IP_VS_SVC_F_PERSISTENT)
 			seq_printf(seq, "persistent %d %08X\n",