diff --git a/ubuntu/networking.md b/ubuntu/networking.md
index 5a01539..7262600 100644
--- a/ubuntu/networking.md
+++ b/ubuntu/networking.md
@@ -13,4 +13,10 @@ https://certbot.eff.org/lets-encrypt/ubuntubionic-apache
 
 
 ip setup:
-https://help.ubuntu.com/lts/serverguide/network-configuration.html
\ No newline at end of file
+https://help.ubuntu.com/lts/serverguide/network-configuration.html
+
+
+## network interfaces
+`ip link` lists all interfaces
+multipass setup some dummy interfaces and left them there.
+to delete did `ip link delete mpqemubr0-dummy`
\ No newline at end of file