iptables由上而下，由Tables，Chains，Rules组成。 INPUT链 – 处理来自外部的数据。 OUTPUT链 – 处理向外发送的数据。 FORWARD链 – 将数据转发到本机的其他网卡设备上。 PREROUTING链 – 处理刚到达本机并在路由转发前的数据包。它会转换数据包中的目标IP地址（destination ...

When deciding on a firewall implementation, most Unix-savvy administrators have usually chosen to use ipfilter on OpenBSD for their combination of capabilities and stability, as the capabilities of ...

Mastering iptables could take a while, but if you have a few rules to cover the basic security needs, you'll be well on your way to protecting your Linux system. Jack Wallen explains some key rules to ...

Linux's iptables allows powerful firewalls to be implemented at a minute fraction of the cost of many commercial offerings. Basic iptables firewalls are packet filters, which means they inspect the ...

Iptables, more properly referred to as “iptables/netfilter” because of the two modules that are involved — the userspace module “iptables” and the kernel ...

Most of us think of iptables strictly as a firewall tool for keeping remote attackers at bay. But did you know it also can be used to keep local users in line? The experimental match extension owner ...

After finally reaching the tipping point with off-the-shelf solutions that can’t match increasing speeds available, we recently took the plunge. Building a homebrew router turned out to be a better ...