怎么定制Linux系统防火墙设置

安装lmule，README有这个提示：* If you are behind a firewall or router, be sure that ports 4662 (TCP)，and 4672 (UDP) are unblocked, or you will *always* receive a low ID.
好像可以改防火墙的配置文件来许可4662端口与4672端口。具体怎么修改？