diff -Nur squid-3.0.STABLE8/src/cf.data.pre squid-3.0.STABLE8-zph/src/cf.data.pre
--- squid-3.0.STABLE8/src/cf.data.pre	2008-07-18 13:02:53.000000000 +0300
+++ squid-3.0.STABLE8-zph/src/cf.data.pre	2008-08-22 13:25:45.000000000 +0300
@@ -1119,6 +1119,60 @@
 	making the request.
 DOC_END
 
+NAME: zph_tos_local
+TYPE: int
+DEFAULT: 0
+LOC: Config.zph_tos_local
+DOC_START
+       Allows you to select a TOS/Diffserv value to mark local hits. Read above
+       (tcp_outgoing_tos) for details/requirements about TOS.
+       Default: 0 (disabled).
+DOC_END
+
+NAME: zph_tos_peer
+TYPE: int
+DEFAULT: 0
+LOC: Config.zph_tos_peer
+DOC_START
+       Allows you to select a TOS/Diffserv value to mark peer hits. Read above
+       (tcp_outgoing_tos) for details/requirements about TOS.
+       Default: 0 (disabled).
+DOC_END
+
+NAME: zph_tos_parent
+COMMENT: on|off
+TYPE: onoff
+LOC: Config.onoff.zph_tos_parent
+DEFAULT: on
+DOC_START
+       Set this to off if you want only sibling hits to be marked.
+       If set to on (default), parent hits are being marked too.
+DOC_END
+
+NAME: zph_preserve_miss_tos
+COMMENT: on|off
+TYPE: onoff
+LOC: Config.onoff.zph_preserve_miss_tos
+DEFAULT: on
+DOC_START
+       If set to on (default), any HTTP response towards clients will
+       have the TOS value of the response comming from the remote
+       server masked with the value of zph_preserve_miss_tos_mask.
+       For this to work correctly, you will need to patch your linux
+       kernel with the TOS preserving ZPH patch.
+DOC_END
+
+NAME: zph_preserve_miss_tos_mask
+TYPE: int
+DEFAULT: 255
+LOC: Config.zph_preserve_miss_tos_mask
+DOC_START
+       Allows you to mask certain bits in the TOS received from the
+       remote server, before copying the value to the TOS send towards
+       clients.
+       Default: 255 (TOS from server is not changed).
+DOC_END
+
 NAME: tcp_outgoing_address
 TYPE: acl_address
 DEFAULT: none
diff -Nur squid-3.0.STABLE8/src/client_side_reply.cc squid-3.0.STABLE8-zph/src/client_side_reply.cc
--- squid-3.0.STABLE8/src/client_side_reply.cc	2008-07-18 13:02:54.000000000 +0300
+++ squid-3.0.STABLE8-zph/src/client_side_reply.cc	2008-08-22 13:25:54.000000000 +0300
@@ -48,6 +48,7 @@
 #include "ESI.h"
 #endif
 #include "MemObject.h"
+#include "fde.h"
 #include "ACLChecklist.h"
 #include "ACL.h"
 #if DELAY_POOLS
@@ -1548,6 +1549,11 @@
         /* guarantee nothing has been sent yet! */
         assert(http->out.size == 0);
         assert(http->out.offset == 0);
+        if (Config.zph_tos_local)
+      	{
+			debugs(33, 1, "ZPH hit hier.code=" << http->request->hier.code <<" TOS="<<Config.zph_tos_local);
+	    	comm_set_tos(http->getConn()->fd,Config.zph_tos_local);
+      	}             
         tempBuffer.offset = reqofs;
         tempBuffer.length = getNextNode()->readBuffer.length;
         tempBuffer.data = getNextNode()->readBuffer.data;
@@ -1827,6 +1833,24 @@
     char *buf = next()->readBuffer.data;
 
     char *body_buf = buf;
+    
+    if (reqofs==0 && !logTypeIsATcpHit(http->logType))
+    {
+		int tos = 0;
+		if (Config.zph_tos_peer && 

+    	 	 (http->request->hier.code==SIBLING_HIT ||

+			 Config.onoff.zph_tos_parent && http->request->hier.code==PARENT_HIT))
+		{
+			tos = Config.zph_tos_peer;
+			debugs(33, 1, "ZPH: Peer hit, TOS="<<tos<<" hier.code="<<http->request->hier.code);
+		}
+		else if (Config.onoff.zph_preserve_miss_tos && Config.zph_preserve_miss_tos_mask)
+		{
+			tos = fd_table[fd].upstreamTOS & Config.zph_preserve_miss_tos_mask;
+			debugs(33, 1, "ZPH: Preserving TOS on miss, TOS="<<tos);
+		}
+		comm_set_tos(fd,tos);
+    }     
 
     if (buf != result.data) {
         /* we've got to copy some data */
diff -Nur squid-3.0.STABLE8/src/fde.h squid-3.0.STABLE8-zph/src/fde.h
--- squid-3.0.STABLE8/src/fde.h	2008-07-18 13:02:54.000000000 +0300
+++ squid-3.0.STABLE8-zph/src/fde.h	2008-08-22 13:26:05.000000000 +0300
@@ -106,7 +106,7 @@
         long handle;
     } win32;
 #endif
-
+    unsigned char upstreamTOS;			/* see FwdState::dispatch()  */
 };
 
 #endif /* SQUID_FDE_H */
diff -Nur squid-3.0.STABLE8/src/forward.cc squid-3.0.STABLE8-zph/src/forward.cc
--- squid-3.0.STABLE8/src/forward.cc	2008-07-18 13:02:54.000000000 +0300
+++ squid-3.0.STABLE8-zph/src/forward.cc	2008-08-22 13:26:10.000000000 +0300
@@ -964,6 +964,52 @@
 
     netdbPingSite(request->host);
 
+    /* Retrieves remote server TOS value, and stores it as part of the
+     * original client request FD object. It is later used to forward
+     * remote server's TOS in the response to the client in case of a MISS.
+     */
+	fde * clientFde = &fd_table[client_fd];
+	if (clientFde)
+	{
+		int tos = 1;
+		int tos_len = sizeof(tos);
+		clientFde->upstreamTOS = 0;
+	    if (setsockopt(server_fd,SOL_IP,IP_RECVTOS,&tos,tos_len)==0)
+	    {
+	       unsigned char buf[512];
+	       int len = 512;
+	       if (getsockopt(server_fd,SOL_IP,IP_PKTOPTIONS,buf,(socklen_t*)&len) == 0)
+	       {
+	           /* Parse the PKTOPTIONS structure to locate the TOS data message
+	            * prepared in the kernel by the ZPH incoming TCP TOS preserving
+	            * patch.
+	            */
+	    	   unsigned char * p = buf;
+	           while (p-buf < len)
+	           {
+	              struct cmsghdr *o = (struct cmsghdr*)p;
+	              if (o->cmsg_len<=0)
+	                 break;
+	
+	              if (o->cmsg_level == SOL_IP && o->cmsg_type == IP_TOS)
+	              {
+	            	  clientFde->upstreamTOS = (unsigned char)(*(int*)CMSG_DATA(o));
+	            	  break;
+	              }
+	              p += CMSG_LEN(o->cmsg_len);
+	           }
+	       }
+	       else
+	       {
+	           debugs(33, 1, "ZPH: error in getsockopt(IP_PKTOPTIONS) on FD "<<server_fd<<" "<<xstrerror());
+	       }
+	    }
+	    else
+	    {
+	    	debugs(33, 1, "ZPH: error in setsockopt(IP_RECVTOS) on FD "<<server_fd<<" "<<xstrerror());
+	    }
+	}    
+
     if (servers && (p = servers->_peer)) {
         p->stats.fetches++;
         request->peer_login = p->login;
diff -Nur squid-3.0.STABLE8/src/structs.h squid-3.0.STABLE8-zph/src/structs.h
--- squid-3.0.STABLE8/src/structs.h	2008-07-18 13:02:54.000000000 +0300
+++ squid-3.0.STABLE8-zph/src/structs.h	2008-08-22 13:26:24.000000000 +0300
@@ -553,6 +553,8 @@
         int emailErrData;
         int httpd_suppress_version_string;
         int global_internal_static;
+        int zph_tos_parent;
+        int zph_preserve_miss_tos;
         int debug_override_X;
         int WIN32_IpAddrChangeMonitor;
     }
@@ -721,6 +723,9 @@
     int sleep_after_fork;	/* microseconds */
     time_t minimum_expiry_time;	/* seconds */
     external_acl *externalAclHelperList;
+    int zph_tos_local;
+    int zph_tos_peer;
+    int zph_preserve_miss_tos_mask;
 #if USE_SSL
 
     struct