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-rw-r--r--src/resolve/resolved-dns-cache.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index eb51b4b895..751e961351 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -458,6 +458,10 @@ int dns_cache_put(
if (r > 0)
continue;
+ /* See https://tools.ietf.org/html/rfc2308, which
+ * say that a matching SOA record in the packet
+ * is used to to enable negative caching. */
+
r = dns_answer_find_soa(answer, q->keys[i], &soa);
if (r < 0)
goto fail;