diff --git a/tun_linux.go b/tun_linux.go
index abca009..e4d1044 100644
--- a/tun_linux.go
+++ b/tun_linux.go
@@ -630,6 +630,23 @@ func (t *NativeTun) rules() []*netlink.Rule {
 			it.Family = unix.AF_INET6
 			rules = append(rules, it)
 		}
+		// Fallback rules after system default rules (32766: main, 32767: default)
+		// Only reached when main and default tables have no route
+		const fallbackPriority = 32768
+		if p4 {
+			it = netlink.NewRule()
+			it.Priority = fallbackPriority
+			it.Table = t.options.IPRoute2TableIndex
+			it.Family = unix.AF_INET
+			rules = append(rules, it)
+		}
+		if p6 {
+			it = netlink.NewRule()
+			it.Priority = fallbackPriority
+			it.Table = t.options.IPRoute2TableIndex
+			it.Family = unix.AF_INET6
+			rules = append(rules, it)
+		}
 		return rules
 	}