diff --git a/src/network/networkd-dhcp4.c b/src/network/networkd-dhcp4.c
index cacd867f9b0..ac1781d83ee 100644
--- a/src/network/networkd-dhcp4.c
+++ b/src/network/networkd-dhcp4.c
@@ -590,7 +590,8 @@ static int dhcp4_set_hostname(Link *link) {
 }
 
 static bool promote_secondaries_enabled(const char *ifname) {
-        char *promote_secondaries_sysctl, *promote_secondaries_path;
+        _cleanup_free_ char *promote_secondaries_sysctl = NULL;
+        char *promote_secondaries_path;
         int r;
 
         promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
@@ -627,7 +628,7 @@ int dhcp4_set_promote_secondaries(Link *link) {
          * interface. If it is not globally enabled or enabled for the
          * specific interface we must either enable it.
          */
-        if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled("default") || promote_secondaries_enabled(link->ifname))) {
+        if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
                 char *promote_secondaries_path = NULL;
 
                 log_link_debug(link, "promote_secondaries is unset, setting it");
diff --git a/sysctl.d/50-default.conf b/sysctl.d/50-default.conf
index aff99300d94..e263cf06284 100644
--- a/sysctl.d/50-default.conf
+++ b/sysctl.d/50-default.conf
@@ -22,15 +22,12 @@ kernel.sysrq = 16
 kernel.core_uses_pid = 1
 
 # Source route verification
-net.ipv4.conf.default.rp_filter = 1
 net.ipv4.conf.all.rp_filter = 1
 
 # Do not accept source routing
-net.ipv4.conf.default.accept_source_route = 0
 net.ipv4.conf.all.accept_source_route = 0
 
 # Promote secondary addresses when the primary address is removed
-net.ipv4.conf.default.promote_secondaries = 1
 net.ipv4.conf.all.promote_secondaries = 1
 
 # Fair Queue CoDel packet scheduler to fight bufferbloat