Index: ifupdown-0.7.52/execute.c
===================================================================
--- ifupdown-0.7.52.orig/execute.c
+++ ifupdown-0.7.52/execute.c
@@ -25,7 +25,7 @@ static void set_environ(interface_defn *
 {
     char **environend;
     int i;
-    const int n_env_entries = iface->n_options + 8;
+    const int n_env_entries = (iface ? iface->n_options : 0) + 8;
 
     {
         char **ppch;
@@ -42,7 +42,7 @@ static void set_environ(interface_defn *
     environend = environ;
     *environend = NULL;
 
-    for (i = 0; i < iface->n_options; i++) {
+    for (i = 0; iface && i < iface->n_options; i++) {
         if (strcmp(iface->option[i].name, "pre-up") == 0 || strcmp(iface->option[i].name, "up") == 0 || strcmp(iface->option[i].name, "down") == 0 || strcmp(iface->option[i].name, "post-down") == 0) {
             continue;
         }
@@ -52,6 +52,7 @@ static void set_environ(interface_defn *
         *environend = NULL;
     }
 
+  if (iface) {
     *(environend++) = setlocalenv("%s=%s", "IFACE", iface->real_iface);
     *environend = NULL;
 
@@ -63,12 +64,17 @@ static void set_environ(interface_defn *
 
     *(environend++) = setlocalenv("%s=%s", "METHOD", iface->method->name);
     *environend = NULL;
+  }
 
+  if (mode) {
     *(environend++) = setlocalenv("%s=%s", "MODE", mode);
     *environend = NULL;
+  }
 
+  if (phase) {
     *(environend++) = setlocalenv("%s=%s", "PHASE", phase);
     *environend = NULL;
+  }
 
     *(environend++) = setlocalenv("%s=%s", "VERBOSITY", verbose ? "1" : "0");
     *environend = NULL;
@@ -168,8 +174,7 @@ int execute_scripts(interface_defn * ifd
         return 1;
 
     char buf[100];
-    snprintf(buf, sizeof(buf), "run-parts %s%s/etc/network/if-%s.d",
-        ignore_failures ? "" : "--exit-on-error ",
+    snprintf(buf, sizeof(buf), "run-parts %s/etc/network/if-%s.d",
         verbose ? "--verbose " : "", opt);
 
     int result = (*exec)(buf);
@@ -285,6 +290,11 @@ int execute(char *command, interface_def
     char *out;
     int ret;
 
+    if (!environ) {
+       /* initialize the environment to find /sbin/ip */
+       set_environ(NULL, NULL, NULL);
+    }
+
     out = parse(command, ifd);
     if (!out) {
         return 0;
Index: ifupdown-0.7.52/inet.defn
===================================================================
--- ifupdown-0.7.52.orig/inet.defn
+++ ifupdown-0.7.52/inet.defn
@@ -89,7 +89,7 @@ method dhcp
         elsif (execable("/sbin/dhclient3"))
     pump -i %iface% [[-h %hostname%]] [[-l %leasehours%]] \
         elsif (execable("/sbin/pump") && mylinuxver() >= mylinux(2,1,100))
-    udhcpc -n -p /run/udhcpc.%iface%.pid -i %iface% [[-x hostname:%hostname%]] \
+    udhcpc -R -b -p /run/udhcpc.%iface%.pid -i %iface% [[-x hostname:%hostname%]] \
         elsif (execable("/sbin/udhcpc") && mylinuxver() >= mylinux(2,2,0))
     dhcpcd [[-h %hostname%]] [[-i %vendor%]] [[-I %client%]] \
            [[-l %leasetime%]] %iface% \