Adds support for setting the default IPv6 gateway for routes using the route-ipv6-gateway option

index 057dbb4b..d2903b87 100644
@@ -1416,12 +1416,10 @@ do_init_route_ipv6_list(const struct options *options,
     int metric = -1;            /* no metric set */
 
     gw = options->ifconfig_ipv6_remote;         /* default GW = remote end */
-#if 0                                   /* not yet done for IPv6 - TODO!*/
-    if (options->route_ipv6_default_gateway)            /* override? */
+    if (options->route_ipv6_default_gateway)
     {
         gw = options->route_ipv6_default_gateway;
     }
-#endif
 
     if (options->route_default_metric)
     {

index b89f4ba2..0d11e968 100644
@@ -200,8 +200,10 @@ static const char usage_message[] =
     "--route-ipv6 network/bits [gateway] [metric] :\n"
     "                  Add IPv6 route to routing table after connection\n"
     "                  is established.  Multiple routes can be specified.\n"
-    "                  gateway default: taken from 'remote' in --ifconfig-ipv6\n"
+    "                  gateway default: taken from --route-ipv6-gateway or 'remote'\n"
+    "                  in --ifconfig-ipv6\n"
     "--route-gateway gw|'dhcp' : Specify a default gateway for use with --route.\n"
+    "--route-ipv6-gateway gw : Specify a default gateway for use with --route-ipv6.\n"
     "--route-metric m : Specify a default metric for use with --route.\n"
     "--route-delay n [w] : Delay n seconds after connection initiation before\n"
     "                  adding routes (may be 0).  If not specified, routes will\n"

@@ -6197,6 +6199,18 @@ add_option(struct options *options,
             }
         }
     }
+    else if (streq(p[0], "route-ipv6-gateway") && p[1] && !p[2])
+    {
+        if (ipv6_addr_safe(p[1]))
+        {
+            options->route_ipv6_default_gateway = p[1];
+        }
+        else
+        {
+            msg(msglevel, "route-ipv6-gateway parm '%s' must be a valid address", p[1]);
+            goto err;
+        }
+    }
     else if (streq(p[0], "route-metric") && p[1] && !p[2])
     {
         VERIFY_PERMISSION(OPT_P_ROUTE);

index 3a6c33f8..66d45081 100644
@@ -329,6 +329,7 @@ struct options
     const char *route_script;
     const char *route_predown_script;
     const char *route_default_gateway;
+    const char *route_ipv6_default_gateway;
     int route_default_metric;
     bool route_noexec;
     int route_delay;