--- /dev/null
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -1673,6 +1673,9 @@ int sifdefaultroute (int unit, u_int32_t
+ memset (&rt, 0, sizeof (rt));
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+
++ SET_SA_FAMILY(rt.rt_gateway, AF_INET);
++ SIN_ADDR(rt.rt_gateway) = gateway;
++
+ rt.rt_dev = ifname;
+
+ if (kernel_version > KVERSION(2,1,0)) {
+@@ -1680,7 +1683,7 @@ int sifdefaultroute (int unit, u_int32_t
+ SIN_ADDR(rt.rt_genmask) = 0L;
+ }
+
+- rt.rt_flags = RTF_UP;
++ rt.rt_flags = RTF_UP | RTF_GATEWAY;
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+ if (!ok_error(errno))
+ error("default route ioctl(SIOCADDRT): %m");