how to do ip address changes in idrac

howto/new-machine-cymru.md

@@ -568,6 +568,21 @@ If that's not good enough, try `hard` instead of soft, see also the
 (rather not much more helpful, I'm afraid) [upstream
 documentation](https://www.dell.com/support/manuals/en-ca/idrac7-8-lifecycle-controller-v2.50.50.50/idrac_2.50.50.50_racadm/racreset?guid=guid-69ea52c5-153d-4369-b7c4-6694a3b9e0d4&lang=en-us).
 
+### IP address change
+
+WARNING: This procedure did not work last time it was tried, it might
+need to be changed.
+
+To change the IP address of the iDRAC itself, you can use the `racadm
+setniccfg` command:
+
+    racadm setniccfg -s 172.30.140.4 255.255.255.0 172.30.140.1
+
+It might take a while for the changes to take effect. In the [latest
+change](https://gitlab.torproject.org/tpo/tpa/team/-/issues/40097#note_2718312) we actually lost access to the RACADM interface after 30
+seconds, but it's unclear if that is because the VLAN was changed or
+it is because the change took 30 seconds to take effect.
+
 ### Other documentation
 
  * [Integrated Dell Remote Access Controller](https://www.dell.com/support/manuals/ca/en/cabsdt1/integrated-dell-remote-access-cntrllr-7-v1.50.50/idrac7ug1.50.50-v1/overview) ([PDF](https://dl.dell.com/topicspdf/integrated-dell-remote-access-cntrllr-7-v1.50.50_users-guide_en-us.pdf))