iptables -t nat -A PREROUTING -p tcp --dport 10000 -j DNAT --to-destination 111.13.101.208:80
iptables -t nat -A POSTROUTING -p tcp -d 111.13.101.208 --dport 80 -j SNAT --to-source  10.0.0.10 --sport 10000

Chain PREROUTING (policy ACCEPT 8 packets, 781 bytes)
pkts bytes target     prot opt in     out     source        destination
11   688 DNAT       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:10000 to:111.13.101.208:80

Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination
0     0 SNAT       tcp  --  *      *       0.0.0.0/0            111.13.101.208      tcp spt:10000 dpt:80 to:10.100.1.138

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination