diff --git a/06.PVE制作DNS服务器.md b/06.PVE制作DNS服务器.md
index 5970410..263b20e 100644
--- a/06.PVE制作DNS服务器.md
+++ b/06.PVE制作DNS服务器.md
@@ -337,17 +337,22 @@ log-level notice
 bind [::]:6053@lo
 bind-tcp [::]:6053@lo
 
-prefetch-domain yes
-
-rr-ttl-min 60
-rr-ttl-max 28800
-rr-ttl-reply-max 14400
-
 cache-size 32768
 force-qtype-SOA 65
 max-query-limit 1024
 max-reply-ip-num 24
 
+prefetch-domain yes
+
+serve-expired yes
+serve-expired-ttl 129600
+serve-expired-reply-ttl 30
+serve-expired-prefetch-time 28800
+
+rr-ttl-min 60
+rr-ttl-max 28800
+rr-ttl-reply-max 14400
+
 server 172.16.1.1 -group intranet -exclude-default-group
 nameserver /fox.home.arpa/intranet
 domain-rules /fox.home.arpa/ -speed-check-mode none -no-cache
diff --git a/src/debian/debian_dns_smartdns.conf b/src/debian/debian_dns_smartdns.conf
index 471b9be..1892e1c 100644
--- a/src/debian/debian_dns_smartdns.conf
+++ b/src/debian/debian_dns_smartdns.conf
@@ -20,17 +20,22 @@ log-level notice
 bind [::]:6053@lo
 bind-tcp [::]:6053@lo
 
-prefetch-domain yes
-
-rr-ttl-min 60
-rr-ttl-max 28800
-rr-ttl-reply-max 14400
-
 cache-size 32768
 force-qtype-SOA 65
 max-query-limit 1024
 max-reply-ip-num 24
 
+prefetch-domain yes
+
+serve-expired yes
+serve-expired-ttl 129600
+serve-expired-reply-ttl 30
+serve-expired-prefetch-time 28800
+
+rr-ttl-min 60
+rr-ttl-max 28800
+rr-ttl-reply-max 14400
+
 server 172.16.1.1 -group intranet -exclude-default-group
 nameserver /fox.home.arpa/intranet
 domain-rules /fox.home.arpa/ -speed-check-mode none -no-cache