conversion iptables to mikrotik

Hi,

Is it possible to convert this iptables rules to a mikrotik router?

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t mangle -N internet
iptables -t mangle -A PREROUTING -i eth0 -p tcp -m tcp --dport 53:65000 -j internet
iptables -t mangle -A internet -j MARK --set-mark 99
iptables -t nat -A PREROUTING -i eth0 -m mark --mark 99 -p tcp -m tcp --dport 54:464 -j DNAT --to-destination 192.168.1.231

iptables -t mangle -I internet 1 -m mac --mac-source D8-30-62-61-05-82 -j RETURN

Thank you in advance.

yes, ti is possible.

please see
http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Filter
http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/NAT
http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Mangle

you just do not have to have rules to create a new chain, it will be created automatically when you specify new name for chain in jump rule.