diff --git a/docker-vpn/Dockerfile b/docker-vpn/Dockerfile
index 43f9c07..c158849 100644
--- a/docker-vpn/Dockerfile
+++ b/docker-vpn/Dockerfile
@@ -9,6 +9,10 @@ RUN apt update -y && \
 
 RUN update-alternatives --set ip6tables /usr/sbin/ip6tables-nft
 
+# legacy xtables support for ipv4 and ipv6
+RUN update-alternatives --set iptables /usr/sbin/iptables-legacy
+RUN update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
+
 # install webserver service
 RUN apt install -y nginx
 
@@ -28,4 +32,4 @@ COPY init-container.sh /opt
 COPY src /var/www/html/
 
 # initialize a container
-CMD /opt/init-container.sh
\ No newline at end of file
+CMD /opt/init-container.sh