diff -ur v2.4.26/linux/include/net/ip_vs.h linux/include/net/ip_vs.h
--- v2.4.26/linux/include/net/ip_vs.h	2004-03-28 16:23:57.000000000 +0300
+++ linux/include/net/ip_vs.h	2004-03-31 00:09:01.717956912 +0300
@@ -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
@@ -82,6 +83,7 @@
 #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 -ur v2.4.26/linux/net/ipv4/ipvs/ip_vs_conn.c linux/net/ipv4/ipvs/ip_vs_conn.c
--- v2.4.26/linux/net/ipv4/ipvs/ip_vs_conn.c	2004-03-28 16:23:57.000000000 +0300
+++ linux/net/ipv4/ipvs/ip_vs_conn.c	2004-03-31 00:55:34.256426536 +0300
@@ -139,6 +139,9 @@
 	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);
 
@@ -292,6 +295,11 @@
  */
 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);
 
@@ -1204,7 +1212,7 @@
 	/*
 	 *	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 -ur v2.4.26/linux/net/ipv4/ipvs/ip_vs_core.c linux/net/ipv4/ipvs/ip_vs_core.c
--- v2.4.26/linux/net/ipv4/ipvs/ip_vs_core.c	2003-11-28 22:04:14.000000000 +0200
+++ linux/net/ipv4/ipvs/ip_vs_core.c	2004-03-31 00:29:52.246847624 +0300
@@ -159,6 +159,7 @@
 	const __u16 *portp;
 	struct ip_vs_conn *ct;
 	__u16  dport;	 /* destination port to forward */
+	__u16 flags;
 	__u32  snet;	 /* source network of the client, after masking */
 
 	portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
@@ -290,6 +291,9 @@
 		dport = portp[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
 	 */
@@ -297,7 +301,7 @@
 			    iph->saddr, portp[0],
 			    iph->daddr, portp[1],
 			    dest->addr, dport,
-			    0,
+			    flags,
 			    dest);
 	if (cp == NULL) {
 		ip_vs_conn_put(ct);
@@ -332,6 +336,7 @@
 	struct ip_vs_conn *cp = NULL;
 	struct ip_vs_dest *dest;
 	const __u16 *portp;
+	__u16 flags;
 
 	/*
 	 *    Persistent service
@@ -357,6 +362,9 @@
 		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.
 	 */
@@ -364,7 +372,7 @@
 			    iph->saddr, portp[0],
 			    iph->daddr, portp[1],
 			    dest->addr, dest->port?dest->port:portp[1],
-			    0,
+			    flags,
 			    dest);
 	if (cp == NULL)
 		return NULL;
@@ -404,6 +412,9 @@
 	    && (inet_addr_type(iph->daddr) == RTN_UNICAST)) {
 		int ret;
 		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);
 
@@ -413,7 +424,7 @@
 				    iph->saddr, portp[0],
 				    iph->daddr, portp[1],
 				    0, 0,
-				    IP_VS_CONN_F_BYPASS,
+				    IP_VS_CONN_F_BYPASS | flags,
 				    NULL);
 		if (cp == NULL) {
 			kfree_skb(skb);
diff -ur v2.4.26/linux/net/ipv4/ipvs/ip_vs_ctl.c linux/net/ipv4/ipvs/ip_vs_ctl.c
--- v2.4.26/linux/net/ipv4/ipvs/ip_vs_ctl.c	2004-03-28 16:23:57.000000000 +0300
+++ linux/net/ipv4/ipvs/ip_vs_ctl.c	2004-03-31 00:45:36.897238936 +0300
@@ -1517,11 +1517,13 @@
 				else
 					temp2[0] = '\0';
 
-				sprintf(temp, "%s  %08X:%04X %s %s",
+				sprintf(temp, "%s  %08X:%04X %s %s%s",
 					ip_vs_proto_name(svc->protocol),
 					ntohl(svc->addr),
 					ntohs(svc->port),
-					svc->scheduler->name, temp2);
+					svc->scheduler->name, temp2,
+					(svc->flags & IP_VS_SVC_F_ONEPACKET)?
+					" ops":"");
 				len += sprintf(buf+len, "%-63s\n", temp);
 				if (len >= length)
 					goto done;
@@ -1562,9 +1564,11 @@
 				else
 					temp2[0] = '\0';
 
-				sprintf(temp, "FWM  %08X %s %s",
+				sprintf(temp, "FWM  %08X %s %s%s",
 					svc->fwmark,
-					svc->scheduler->name, temp2);
+					svc->scheduler->name, temp2,
+					(svc->flags & IP_VS_SVC_F_ONEPACKET)?
+					" ops":"");
 				len += sprintf(buf+len, "%-63s\n", temp);
 				if (len >= length)
 					goto done;