diff --git a/sisr1/TP05-installation-proxy/nat/dnsfwd.sh b/sisr1/TP05-installation-proxy/nat/dnsfwd.sh
new file mode 100644
index 0000000..36826d4
--- /dev/null
+++ b/sisr1/TP05-installation-proxy/nat/dnsfwd.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+echo "1" > /proc/sys/net/ipv4/ip_forward
+nft add table dnsfwd
+nft add chain dnsfwd prerouting {type nat hook prerouting priority 0 \; }
+nft add chain dnsfwd postrouting {type nat hook postrouting priority 0 \; }
+nft add rule dnsfwd postrouting tcp dport 53 masquerade
+nft add rule dnsfwd postrouting udp dport 53 masquerade
+nft add rule dnsfwd prerouting tcp dport 53 masquerade
+nft add rule dnsfwd prerouting udp dport 53 masquerade
+nft add rule dnsfwd prerouting ct state established,related accept
+nft add rule dnsfwd postrouting ct state established,related accept