diff --git a/resources/chaosknoten/auth-dns/zones/ccchh.net.zone b/resources/chaosknoten/auth-dns/zones/ccchh.net.zone
index 91519200..7e7099b6 100644
--- a/resources/chaosknoten/auth-dns/zones/ccchh.net.zone
+++ b/resources/chaosknoten/auth-dns/zones/ccchh.net.zone
@@ -101,6 +101,8 @@ dooris                          A     10.89.208.16
                                 AAAA  2a07:c481:1:33::1c
 _acme-challenge.dooris          CNAME 37caae1f-b77f-4eb1-aa71-dc3f7ed24360.auth.acmedns.hamburg.ccc.de.
 
+dooris-legacy                   A     10.89.208.31
+
 hmdooris-ccu                    A     10.89.208.17
 
 dooris-ng                       A     10.89.209.29
diff --git a/resources/z9/z9-router/kea_dhcp.yaml b/resources/z9/z9-router/kea_dhcp.yaml
index 4f7ea31f..1970c3ef 100644
--- a/resources/z9/z9-router/kea_dhcp.yaml
+++ b/resources/z9/z9-router/kea_dhcp.yaml
@@ -49,6 +49,9 @@ kea_dhcp__dhcp4:
         - ip-address: 10.89.209.28
           hostname: hp-color
           hw-address: "3c:52:82:29:21:79"
+        - ip-address: 10.89.208.31
+          hostname: dooris-legacy
+          hw-address: "b8:27:eb:80:a5:66"
         - ip-address: 10.89.209.29
           hostname: dooris-ng
           hw-address: "6c:4b:90:19:21:a1"