防火墙firewalloeth0

⑴ 什么是“防火墙”(firewall)

所谓防火墙指的是一个由软件和硬件设备组合而成、在内部网和外部网之间、专用网与公共网之间的界面上构造的保护屏障.是一种获取安全性方法的形象说法，它是一种计算机硬件和软件的结合，使Interne
t与Intranet之间建立起一个安全网关（Security Gateway），从而保护内部网免受非法用户的侵入，防火墙主要由服务访问规则、验证工具、包过滤和应用网关4个部分组成， 防火墙就是一个位于计算机和它所连接的网络之间的软件或硬件。该计算机流入流出的所有网络通信均要经过此防火墙。 在网络中，所谓“防火墙”，是指一种将内部网和公众访问网(如Internet)分开的方法，它实际上是一种隔离技术。防火墙是在两个网络通讯时执行的一种访问控制尺度，它能允许你“同意”的人和数据进入你的网络，同时将你“不同意”的人和数据拒之门外，最大限度地阻止网络中的黑客来访问你的网络。换句话说，如果不通过防火墙，公司内部的人就无法访问Internet，Internet上的人也无法和公司内部的人进行通信。
-----来源于网络

⑵ 操作系统的防火墙Windows Firewall服务无法启动

解决操作系统的防火墙Windows Firewall服务无法启动的步骤如下：

1.桌面上的计算机（我的电脑）右击-管理。

⑶ 阻止centos7主动外联

centos7 及以上版本不再使用 iptables 来管理防火墙规则，默认使用 firewall。

firewall-cmd --direct --add-rule ipv4 filter OUTPUT 0 -o eth0 -d 192.168.1.25/32 -j ACCEPT
firewall-cmd --direct --add-rule ipv4 filter OUTPUT 1 -o eth0 -d 192.168.1.28/32 -j DROP

如果以上命令没用效果，你可以执行以下命令清理以上两条命令而不用重启系统：
firewall-cmd --direct --remove-rules ipv4 filter OUTPUT
如果以上命令有效，再添加 --permanent 命令去重新执行，以永久生效：
firewall-cmd --permanent --direct --add-rule ipv4 filter OUTPUT 0 -o eth0 -d 192.168.1.25/32 -j ACCEPT
firewall-cmd --permanent --direct --add-rule ipv4 filter OUTPUT 1 -o eth0 -d 192.168.1.28/32 -j DROP

⑷ linux的iptables和firewall的区别

firewall是centos7里面的新的防火墙命令，它底层还是使用 iptables 对内核命令动态通信包过滤的，简单理解就是firewall是centos7下管理iptables的新命令

⑸ Firewall 是什么意思我记得是防火墙

同学你好，很高兴为您解答！

防火墙

防止未经授权的流量进出安全网络的网络配置 （通常既指计算机硬件也指软件）。

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⑹ oss中防火墙和outpost firewall free的防火墙一样嘛

饿……OSS中的防火墙功能可能稍微强一些……但是总体来说没啥差别，再加上破解也比较难，建议使用免费

⑺ 如何在Linux中启动/停止和启用/禁用FirewallD和Iptables防火墙

清除iptables规则 1 如果启动的iptables防火墙不想关闭的话，可以通过iptables -F 来清除防火墙关闭。然后通过iptables -L查看 END 关闭iptables服务 如果要关闭iptables，可以通过命令/etc/init.d/iptables stop 停止 除此之外，iptables的服务...

⑻ 什么是防火墙浏览器firewall Browser

好多只是吹出来的，不可尽信。如果真有防火墙浏览器，那速度肯定会很慢的，现在好多浏览器已经不错了，可以用非IE核心的，如谷歌浏览器、Opera等。

⑼ 防火墙——firewall，名字的由来

Firewall technology first began to emerge in the late 1980s. Internet was still a fairly new technology in terms of its global usage and connectivity. The original idea was formed in response to a number of major internet security breaches, which occurred in the late 1980s. In 1988 an employee at the NASA Ames Research Center in California sent a memo by email to his colleagues that read, "We are currently under attack from an Internet VIRUS! It has hit Berkeley, UC San Diego, Lawrence Livermore, Stanford, and NASA Ames." This virus known as the Morris Worm was carried by e-mail and is now a common nuisance for even the most ambiguous domestic user. The Morris Worm was the first large scale attack on Internet security, of which the online community neither expected, nor were prepared for. The internet community made it a top priority to combat any future attacks from happening and began to collaborate on new ideas, systems and software to make the internet safe again.

The first paper published on firewall technology was in 1988, when Jeff Mogul from Digital Equipment Corp. developed filter systems know as packet filter firewalls. This fairly basic system was the first generation of what would become a highly evolved and technical internet security feature. From 1980-1990 two colleagues from AT&T Bell Laboratories, Dave Presetto and Howard Trickey, developed the second generation of firewalls known as circuit level firewalls. Publications by Gene Spafford of Pure University, Bill Cheswick at AT&T laboratories and Marcus Ranum described a third generation firewall known as application layer firewall, also known as proxy-based firewalls. Marcus Ranum's work on the technology spearheaded the creation of the first commercial proct. The proct was released by Digital Equipment Corporation's (DEC) who named it the SEAL proct. DEC’s first major sale was on June 13, 1991 to a chemical company based on the East-Coast of the USA.

At AT&T Bill Cheswick and Steve Bellovin were continuing their research in packet filtering and developed a working model for their own company based upon their original 1st generation architecture. In 1992, Bob Braden and Annette DeSchon at the University of Southern California were developing their own fourth generation packet filter firewall system. The proct known as “Visas” was the first system to have a visual integration interface with colours and icons, which could be easily implemented to and accessed on a computer operating system such as Microsoft's Windows or Apple's Mac/OS. In 1994 an Israeli company called Check Point Software Technologies built this in to readily available software known as FireWall-1. A second generation of proxy firewalls was based on Kernel Proxy technology. This design is constantly evolving but its basic features and codes are currently in widespread use in both commercial and domestic computer systems. Cisco, one of the largest internet security companies in the world released the proct to the public in 1997.

The new Next Generation Firewalls leverage their existing deep packet inspection engine by sharing this functionality with an Intrusion-prevention system.

对不起，是英文的，请自己翻译啦!

⑽ Linux里面防火墙学firewall好还是学iptables

这两个都应该学习，没有好坏之分，centos7之后默认firewall，所以根据自己负责服务器情况选择即可，如果是初学，建议都掌握