diff -aur src/pppd/ipcp.c patched/pppd/ipcp.c
--- src/pppd/ipcp.c	2009-11-16 23:26:07.000000000 +0100
+++ patched/pppd/ipcp.c	2010-01-15 17:31:05.696318649 +0100
@@ -96,6 +96,7 @@
 static bool ask_for_local;		/* request our address from peer */
 static char vj_value[8];		/* string form of vj option value */
 static char netmask_str[20];		/* string form of netmask value */
+static bool noapplycfg;			/* don't apply network config */
 
 /*
  * Callbacks for fsm code.  (CI = Configuration Information)
@@ -231,6 +232,9 @@
       "set local and remote IP addresses",
       OPT_NOARG | OPT_A2PRINTER, (void *) &printipaddr },
 
+    { "noapplycfg", o_bool, &noapplycfg,
+      "don't apply network config", 1 },
+
     { NULL }
 };
 
@@ -1734,14 +1738,15 @@
 	wo->accept_local = 1;
 	ask_for_local = 0;	/* don't tell the peer this address */
     }
-    if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
+    if (!noapplycfg &&
+	!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
 	return 0;
     ipcp_script(_PATH_IPPREUP, 1);
-    if (!sifup(u))
+    if (!noapplycfg && !sifup(u))
 	return 0;
     if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
 	return 0;
-    if (wo->default_route)
+    if (!noapplycfg && wo->default_route)
 	if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
 	    default_route_set[u] = 1;
     if (wo->proxy_arp)
@@ -1808,7 +1813,8 @@
 	script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0);
     if (usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
 	script_setenv("USEPEERDNS", "1", 0);
-	create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
+	if (!noapplycfg)
+		create_resolv(go->dnsaddr[0], go->dnsaddr[1]);
     }
 
     /*
@@ -1874,7 +1880,7 @@
 	mask = GetMask(go->ouraddr);
 
 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
-	if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
+	if (!noapplycfg && !sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
 	    if (debug)
 		warn("Interface configuration failed");
 	    ipcp_close(f->unit, "Interface configuration failed");
@@ -1886,7 +1892,7 @@
 	ipcp_script(_PATH_IPPREUP, 1);
 
 	/* bring the interface up for IP */
-	if (!sifup(f->unit)) {
+	if (!noapplycfg && !sifup(f->unit)) {
 	    if (debug)
 		warn("Interface failed to come up");
 	    ipcp_close(f->unit, "Interface configuration failed");
@@ -1894,7 +1900,7 @@
 	}
 
 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
-	if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
+	if (!noapplycfg && !sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
 	    if (debug)
 		warn("Interface configuration failed");
 	    ipcp_close(f->unit, "Interface configuration failed");
@@ -1905,12 +1911,14 @@
 
 	/* assign a default route through the interface if required */
 	if (ipcp_wantoptions[f->unit].default_route) 
-	    if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
+	    if (!noapplycfg &&
+		sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
 		default_route_set[f->unit] = 1;
 
 	/* Make a proxy ARP entry if requested. */
 	if (ho->hisaddr != 0 && ipcp_wantoptions[f->unit].proxy_arp)
-	    if (sifproxyarp(f->unit, ho->hisaddr))
+	    if (!noapplycfg &&
+		sifproxyarp(f->unit, ho->hisaddr))
 		proxy_arp_set[f->unit] = 1;
 
 	ipcp_wantoptions[0].ouraddr = go->ouraddr;