diff -Nur linux-2.6.15.5/include/linux/ip.h linux-2.6.15.5-zph/include/linux/ip.h
--- linux-2.6.15.5/include/linux/ip.h	2006-03-02 00:37:27.000000000 +0200
+++ linux-2.6.15.5-zph/include/linux/ip.h	2006-03-03 13:07:35.000000000 +0200
@@ -157,6 +157,7 @@
 	int			mc_index;	/* Multicast device index */
 	__u32			mc_addr;
 	struct ip_mc_socklist	*mc_list;	/* Group array */
+
 	/*
 	 * Following members are used to retain the infomation to build
 	 * an ip header on each ip fragmentation while the socket is corked.
@@ -170,6 +171,7 @@
 		u32			addr;
 		struct flowi		fl;
 	} cork;
+	__u8                    zph_tos; 	/* ZPH TOS received on connect */	
 };
 
 #define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
diff -Nur linux-2.6.15.5/net/ipv4/ip_sockglue.c linux-2.6.15.5-zph/net/ipv4/ip_sockglue.c
--- linux-2.6.15.5/net/ipv4/ip_sockglue.c	2006-03-02 00:37:27.000000000 +0200
+++ linux-2.6.15.5-zph/net/ipv4/ip_sockglue.c	2006-03-03 13:07:35.000000000 +0200
@@ -1044,6 +1044,12 @@
 				int hlim = inet->mc_ttl;
 				put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
 			}
+
+			if (inet->cmsg_flags&IP_CMSG_TOS) {
+				int hlim = inet->zph_tos;
+				put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(hlim), &hlim);
+			}
+
 			len -= msg.msg_controllen;
 			return put_user(len, optlen);
 		}
diff -Nur linux-2.6.15.5/net/ipv4/tcp_input.c linux-2.6.15.5-zph/net/ipv4/tcp_input.c
--- linux-2.6.15.5/net/ipv4/tcp_input.c	2006-03-02 00:37:27.000000000 +0200
+++ linux-2.6.15.5-zph/net/ipv4/tcp_input.c	2006-03-03 13:11:52.000000000 +0200
@@ -3967,6 +3967,7 @@
 					 struct tcphdr *th, unsigned len)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
+	struct inet_sock *inet = inet_sk(sk);
 	int saved_clamp = tp->rx_opt.mss_clamp;
 
 	tcp_parse_options(skb, &tp->rx_opt, 0);
@@ -4028,6 +4029,12 @@
 		if (tp->ecn_flags&TCP_ECN_OK)
 			sock_set_flag(sk, SOCK_NO_LARGESEND);
 
+		/* ZPH:
+		 * Copy TOS field from the SYNACK packet to zph_tos field
+		 * of the af_inet member of sock structure
+		 */
+		inet->zph_tos = skb->nh.iph->tos;
+
 		tp->snd_wl1 = TCP_SKB_CB(skb)->seq;
 		tcp_ack(sk, skb, FLAG_SLOWPATH);