3 files changed, 22 insertions, 4 deletions
diff --git a/src/core/dhcp/nm-dhcp-client.c b/src/core/dhcp/nm-dhcp-client.c
index 4ebc1754..cd6e67e2 100644
--- a/src/core/dhcp/nm-dhcp-client.c
+++ b/src/core/dhcp/nm-dhcp-client.c
@@ -275,10 +275,25 @@ nm_dhcp_client_create_options_dict(NMDhcpClient *self, gboolean static_keys)
     return options;
 }
 
+/**
+ * nm_dhcp_client_get_lease():
+ * @self: the client
+ * @ignore_acd_pending: FALSE means to only return the lease that already
+ * passed ACD, thus it is in use by us. TRUE means to return a new lease
+ * that might still be pending of Address Collision Detection (ACD) check,
+ * if there is one, or return the current lease that passed ACD if not.
+ *
+ * Returns the current lease that passed ACD or a pending lease still under
+ * ACD check.
+ *
+ */
 const NML3ConfigData *
-nm_dhcp_client_get_lease(NMDhcpClient *self)
+nm_dhcp_client_get_lease(NMDhcpClient *self, gboolean ignore_acd_pending)
 {
-    return NM_DHCP_CLIENT_GET_PRIVATE(self)->l3cd_curr;
+    if (ignore_acd_pending)
+        return NM_DHCP_CLIENT_GET_PRIVATE(self)->l3cd_curr;
+    else
+        return NM_DHCP_CLIENT_GET_PRIVATE(self)->l3cd_next;
 }
 
 /*****************************************************************************/
diff --git a/src/core/dhcp/nm-dhcp-client.h b/src/core/dhcp/nm-dhcp-client.h
index 2b262f76..8c685faf 100644
--- a/src/core/dhcp/nm-dhcp-client.h
+++ b/src/core/dhcp/nm-dhcp-client.h
@@ -242,7 +242,7 @@ const NMDhcpClientConfig *nm_dhcp_client_get_config(NMDhcpClient *self);
 
 pid_t nm_dhcp_client_get_pid(NMDhcpClient *self);
 
-const NML3ConfigData *nm_dhcp_client_get_lease(NMDhcpClient *self);
+const NML3ConfigData *nm_dhcp_client_get_lease(NMDhcpClient *self, gboolean ignore_acd_pending);
 
 void nm_dhcp_client_stop(NMDhcpClient *self, gboolean release);
 
diff --git a/src/core/dhcp/nm-dhcp-nettools.c b/src/core/dhcp/nm-dhcp-nettools.c
index b81ce77a..f4f244c6 100644
--- a/src/core/dhcp/nm-dhcp-nettools.c
+++ b/src/core/dhcp/nm-dhcp-nettools.c
@@ -1484,7 +1484,10 @@ stop(NMDhcpClient *client, gboolean release)
     NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE(self);
 
     if (release) {
-        if (n_dhcp4_client_probe_release(priv->probe))
+        /* After we receive a lease from server, it doesn't matter if we completed ACD,
+         * we should send the release message. */
+        if (nm_dhcp_client_get_lease(client, FALSE)
+            && n_dhcp4_client_probe_release(priv->probe) < 0)
             _LOGT("dhcp-client4: failed to send request with RELEASE message");
     }