diff --git a/2025/xg-infra-upgrade-2025.md b/2025/xg-infra-upgrade-2025.md
index 0542d7e..3ed8368 100644
--- a/2025/xg-infra-upgrade-2025.md
+++ b/2025/xg-infra-upgrade-2025.md
@@ -154,6 +154,9 @@ To make it visible again
 
 See https://docs.oracle.com/cd/E78901_01/html/E78912/gprhq.html
 
+## Internal DNS server
+
+* https://blog.marcg.pizza/marcg/a-quick-and-dirty-dns-server-using-freebsd-100daystooffload-day-28
 # See also
 
 * [[freebsd-notes]]