network: always enable IPv4 ACD for statically configured IPv4LL address

diff --git a/src/network/networkd-address.c b/src/network/networkd-address.c
index afcbb12473bd00f6c0fc1303969cf5f1b287f08b..04ad2aa69d4beab3dea59e312ba6a76533695bde 100644 (file)
--- a/src/network/networkd-address.c
+++ b/src/network/networkd-address.c
@@ -2115,6 +2115,13 @@ static int address_section_verify(Address *address) {
             !FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
                 address->flags |= IFA_F_NODAD;
 
+        if (address->family == AF_INET && in4_addr_is_link_local(&address->in_addr.in) &&
+            !FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
+                log_debug("%s: An IPv4 link-local address is specified, enabling IPv4 Address Conflict Detection (ACD).",
+                          address->section->filename);
+                address->duplicate_address_detection |= ADDRESS_FAMILY_IPV4;
+        }
+
         return 0;
 }