diff --git a/src/gateway/linux.rs b/src/gateway/linux.rs
index a17e1c4..34543b9 100644
--- a/src/gateway/linux.rs
+++ b/src/gateway/linux.rs
@@ -93,9 +93,16 @@ fn get_ipv6_gateway_map() -> HashMap<String, Ipv6Addr> {
     for row in route_table {
         let fields: Vec<&str> = row.split_whitespace().collect();
         if fields.len() >= 10 {
+            // fields[0]: destination
+            // fields[1]: destination prefix length
             // fields[4]: IPv6 Address 32 hex chars without colons
             // fields[9]: Interface Name
-            if fields[4] != "00000000000000000000000000000000" {
+
+            // default route has zero destination and zero prefix length
+            if fields[0] == "00000000000000000000000000000000"
+                && fields[1] == "00"
+                && fields[4] != "00000000000000000000000000000000"
+            {
                 ipv6_gateway_map.insert(fields[9].to_string(), convert_hex_ipv6(fields[4]));
             }
         }