que tal
PREROUTING -i eth0 -p udp --match multiport --dport 10000-14999 -j DNAT --to 192.168.110.101
ou
PREROUTING -i eth0 -p udp --match multiport --dport 10000-14999 -j DNAT --to 192.168.110.101:10000-14999
editar
-t nat -A PREROUTING -i eth0 -p udp --match multiport --dport 10000-14999 -j DNAT --to 192.168.110.101
-t nat -A POSTROUTING -s 192.168.110.101 -j SNAT --to-destination 192.168.110.1