diff --git a/src/network/networkd-routing-policy-rule.c b/src/network/networkd-routing-policy-rule.c
index 43f69851c5..6ad22bd5c8 100644
--- a/src/network/networkd-routing-policy-rule.c
+++ b/src/network/networkd-routing-policy-rule.c
@@ -746,6 +746,11 @@ static const RoutingPolicyRule kernel_rules[] = {
 static bool routing_policy_rule_is_created_by_kernel(const RoutingPolicyRule *rule) {
         assert(rule);
 
+        if (rule->l3mdev > 0)
+                /* Currently, [RoutingPolicyRule] does not explicitly set FRA_L3MDEV. So, if the flag
+                 * is set, it is safe to treat the rule as created by kernel. */
+                return true;
+
         for (size_t i = 0; i < ELEMENTSOF(kernel_rules); i++)
                 if (routing_policy_rule_equal(rule, &kernel_rules[i]))
                         return true;
@@ -900,6 +905,12 @@ int manager_rtnl_process_rule(sd_netlink *rtnl, sd_netlink_message *message, Man
                 return 0;
         }
 
+        r = sd_netlink_message_read_u8(message, FRA_L3MDEV, &tmp->l3mdev);
+        if (r < 0 && r != -ENODATA) {
+                log_warning_errno(r, "rtnl: could not get FRA_L3MDEV attribute, ignoring: %m");
+                return 0;
+        }
+
         r = sd_netlink_message_read(message, FRA_SPORT_RANGE, sizeof(tmp->sport), &tmp->sport);
         if (r < 0 && r != -ENODATA) {
                 log_warning_errno(r, "rtnl: could not get FRA_SPORT_RANGE attribute, ignoring: %m");
@@ -1544,6 +1555,12 @@ static int routing_policy_rule_section_verify(RoutingPolicyRule *rule) {
         if (rule->family == AF_UNSPEC && rule->address_family == ADDRESS_FAMILY_NO)
                 rule->family = AF_INET;
 
+        /* Currently, [RoutingPolicyRule] does not have a setting to set FRA_L3MDEV flag. Please also
+         * update routing_policy_rule_is_created_by_kernel() when a new setting which sets the flag is
+         * added in the future. */
+        if (rule->l3mdev > 0)
+                assert_not_reached("FRA_L3MDEV flag should not be configured.");
+
         return 0;
 }
 
diff --git a/src/network/networkd-routing-policy-rule.h b/src/network/networkd-routing-policy-rule.h
index 3786eee34b..ded312b73e 100644
--- a/src/network/networkd-routing-policy-rule.h
+++ b/src/network/networkd-routing-policy-rule.h
@@ -28,6 +28,7 @@ typedef struct RoutingPolicyRule {
         uint8_t protocol; /* FRA_PROTOCOL */
         uint8_t to_prefixlen;
         uint8_t from_prefixlen;
+        uint8_t l3mdev; /* FRA_L3MDEV */
 
         uint32_t table;
         uint32_t fwmark;