Setting MTS behind a firewall

Hi, I´ve a Linux machine running Oracle 8.1.7. In this machine I´ve also configured a firewall using iptables (RedHat 7.2), and I allow incoming packets to port 1521 (listener port). But if I set up the MTS server, as known it opens a second port, which changes each time the database is stopped/started, and thereby, I cannot put a new rule in my firewall relative to that port.

The MTS is set using the sintax:

mts_dispatchers = "(PROTOCOL=TCP)"
mts_dispatchers = "(PROTOCOL=IPC)(DISPATCHERS=1)"
mts_max_dispatchers = 5
mts_servers = 1
mts_max_servers = 10

I search in metalink, and I find that the port can be set using:

mts_dispatchers = "(ADDRESS=(PROTOCOL=TCP)(HOST=my_ip_address)(PORT=fixed_port))"
mts_dispatchers = "(PROTOCOL=IPC)(DISPATCHERS=1)"
mts_max_dispatchers = 5
mts_servers = 1
mts_max_servers = 10

but I probed it and it doesn´t work!!!!

Does anybody know what am I doing wrong?

Thanks a lot, and sorry for my english :-)

-- 
Atte.
Álvaro Palma Aste
Grupo de Ing. Biomédica
Depto. de Ing. Eléctrica - U. de Chile
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