and this other iptables :
iptables -t nat -A PREROUTING -d 192.168.0.50/32 -i eth1 -m state --state NEW -j DNAT --to-destination 10.10.10.100 iptables -t nat -A POSTROUTING -s 10.10.10.100/32 -o eth1 -j SNAT --to-source 192.168.0.50
and this other iptables :
iptables -t nat -A PREROUTING -d 192.168.0.50/32 -i eth1 -m state --state NEW -j DNAT --to-destination 10.10.10.100
iptables -t nat -A POSTROUTING -s 10.10.10.100/32 -o eth1 -j SNAT --to-source 192.168.0.50