Debian 10 - defaults to nftables by default this enables iptables

https://wiki.debian.org/nftables

debian/resources/iptables.sh

@@ -44,6 +44,12 @@ iptables -P INPUT DROP
 iptables -P FORWARD DROP
 iptables -P OUTPUT ACCEPT
 
+# Debian 10 - defaults to nftables by default this enables iptables
+if [ ."$os_codename" = ."buster" ]; then
+	update-alternatives --set iptables /usr/sbin/iptables-legacy
+	update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
+fi
+
 #answer the questions for iptables persistent
 echo iptables-persistent iptables-persistent/autosave_v4 boolean true | debconf-set-selections
 echo iptables-persistent iptables-persistent/autosave_v6 boolean true | debconf-set-selections