Fix from Glenn McGrath.
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index c3cfcd8..d4167e9 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -769,7 +769,7 @@
llist_t *iface_list;
for (iface_list = defn->ifaces; iface_list; iface_list = iface_list->link) {
struct interface_defn_t *tmp = (struct interface_defn_t *) iface_list->data;
- if ((strcmp(tmp->iface, currif->iface) == 0) ||
+ if ((strcmp(tmp->iface, currif->iface) == 0) &&
(tmp->address_family == currif->address_family)) {
bb_error_msg("duplicate interface \"%s\"", tmp->iface);
return NULL;