iptables问题求解

zxf1942

CentOS5下用BT下载文件问题？

E文太烂，帮忙给解释下这是什么意思？

iptables -I INPUT -p tcp --dport <your_port_number> -j ACCEPT
iptables -I INPUT -p udp --dport <your_port_number> -j ACCEPT

<your_port_number> is the port number you have used for port forwarding (Avoid 6881-6999, any from 49125-65535 is fine)

Once you've established the port is open you need to make the change persist through a reboot

create a file /etc/init.d/iptables_azureus and add the lines below
(sleep 220
/sbin/iptables -I INPUT -p tcp --dport <your_port_number> -j ACCEPT
/sbin/iptables -I INPUT -p udp --dport <your_port_number> -j ACCEPT ) &

The (sleep 220 is there to make the script wait a few minutes to allow subsequent firewall configuration scripts to run. 220 seconds is a large value and you may choose to configure a lower value. The key is that the opening of the azureus port is not countermanded by the firewall initialisation which runs later. At the end is a ) & which allows the script to let the rest of the boot continue, while the script waits.

chmod +x /etc/init.d/iptables_azureus make the file executable
update-rc.d iptables_azureus start 51 S . links the file into the startup sequence

是不是让我创建/etc/init.d/iptables_azureus这个文件，并加入：
sleep 220
/sbin/iptables -I INPUT -p tcp --dport <your_port_number> -j ACCEPT
/sbin/iptables -I INPUT -p udp --dport <your_port_number> -j ACCEPT
那么your_port_number我到底该添多少？6881行吗？

chmod +x /etc/init.d/iptables_azureus make the file executable是把iptables_azureus变为可执行文件吧。

update-rc.d iptables_azureus start 51 S . links the file into the startup sequence这个是让iptables_azureus在系统启动是自动运行吧。那么他是怎么实现的呢？
我运行
#update-rc.d iptables_azureus start 51 S
#command not found
正确命令应该是什么阿 ？
如果我在启动后执行：
# iptables -I INPUT -p udp --dport 6881 -j ACCEPT
# iptables -I INPUT -p tcp --dport 6881 -j ACCEPT
是不是一样可以起到上面的作用阿 ？