How can i convert the below given IPtables DNAT to Astaro
iptables -t nat -N maildnat_internet
iptables -t nat -A PREROUTING -i external interface -s ! 192.168.0.0/16 -d 202.54.20.3 -j maildnat_internet
iptables -t nat -A maildnat_internet -i external interface -d 202.54.20.3 -j DNAT --to-destination 192.168.20.3
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