*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -d 5.7.1.4 -i lo -j DNAT --to-destination 5.1.7.4
-A POSTROUTING -s 5.1.7.4 -o enp0s3 -j SNAT --to-source 5.7.1.4
COMMIT
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -i lo -j ACCEPT
-A FORWARD -i lo -o enp0s3 -j ACCEPT
-A FORWARD -i enp0s3 -o lo -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
COMMIT