10.2.2. Port Ranges
When you define Other Ports in the system-config-securitylevel tool, you may now specify port ranges. For example, if you specify 6881-6999:tcp, the following line is added to /etc/sysconfig/iptables:
A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6881:6999 -j ACCEPT
as-tu essayé en utilisant un interval, par exemple 23-23:tcp ?