diff --git a/agent/plugins/domainjoin/domainjoin_unix_script.go b/agent/plugins/domainjoin/domainjoin_unix_script.go
index 69bf64c51..2877711ef 100755
--- a/agent/plugins/domainjoin/domainjoin_unix_script.go
+++ b/agent/plugins/domainjoin/domainjoin_unix_script.go
@@ -602,11 +602,12 @@ do_dns_config() {
     if [ $LINUX_DISTRO = "UBUNTU" ]; then
         if [ -d /etc/netplan ]; then
             # Ubuntu 18.04
+            if_name=$(ip route list | grep default | grep -E  'dev (\w+)' -o | awk '{print $2}')
             cat << EOF | tee /etc/netplan/99-custom-dns.yaml
 network:
     version: 2
     ethernets:
-        eth0:
+        $if_name:
             nameservers:
                 addresses: [$INPUT_DNS_IP_ADDRESS1, $INPUT_DNS_IP_ADDRESS2]
             dhcp4-overrides: