查看完整版本: CCNA:路由器配置技巧 如何防止网络黑客入侵

chunyanlkim 2008-8-13 17:53

CCNA:路由器配置技巧 如何防止网络黑客入侵

正是由于企业网应用的复杂化,使得网络资源变得更加紧张,在这样的环境下,企业网远端管理成为企业网管理员的心病。各大网络设备生产商也在企业网路由器产品上面下了不少功夫,经过长期对企业网网络应用环境的研究分析,开发出一系列针对复杂应用环境下网络应用的优化措施和高级功能。例如:路由器的远程管理,这样可以减轻了管理员的负担,也为企业节约了维护成本。但万事都有两面性,在方便自己的同时,也方便了某些恶意用户。如果设置不当,安全措施不到位,企业路由器极有可能被黑客接管,整个企业的网络就无安全性可言。
对于通常的网络来说,路由器将是保护内部网的第一道关口,因此在网络安全管理上,必须对路由器进行合理规划、配置,采取必要的安全保护措施,避免因路由器自身的安全问题而给整个网络系统带来漏洞和风险。
保护路由器口令
假设一个分公司在郊区设立了营销网点,营销网点的员工使用宽带路由器共享上网,和公司总部保持联系。如果出现了问题,管理员需要坐两个多小时的车到营销网点对宽带路由器进行维护,非常疲惫。不过,他想到了启用宽带路由器的“远程控制”功能,在总部对路由器进行远程维护。然而,安全问题开始困扰他,在方便自己的同时,这也方便了那些“不怀好意”者,一旦他们得到路由器的管理员账号,就能进行各种破坏活动,后果是不堪设想的。那么,如何才能增强远程控制的安全呢?
可见帐户和密码是路由器的第一道安全防线,要想对宽带路由器进行管理,首先必须拥有路由器的管理员账号。但默认情况下,路由器的初始账号和密码都比较简单,特别是启用了路由器的远程控制功能后,公网中的其他用户就有机会访问到路由器。如果不对路由器的初始账号进行修改,使它变得更为复杂,让不怀好意者难以猜测和破解,那么路由器就可能被他人利用。一旦密码泄漏,网络也就毫无安全可言。
开启路由器防火墙
路由器远程管理的安全性大大增强了,但面对网络中无时无刻都在涌现的病毒和黑客攻击,为了更好地利用路由器内置的“防火墙”为路由器的远程控制安全加上“双保险”。在宽带路由器管理界面中,依次点击“安全设置→防火墙设置”,在右侧的设置框中选中“开启防火墙”选项,点击“保存”按钮后启用路由器的防火墙功能。接着点击“高级安全设置”,进入“高级安全设置”页面。这里提供了一些更具体的安全防御功能,如防御DoS攻击、ICMP-FLOOD攻击过滤和TCP-SYN-FLOOD攻击过滤等。
设置隐蔽的端口、特定的IP及关闭
为宽带路由器设置了复杂的访问账号,但这只是为远程安全管理路由器打下了好的基础。然而,很多路由器默认是没有启用“远程控制”功能的,因此还要手工启用,而且在启用过程中还有很多增强安全的技巧和方法。在宽带路由器管理界面中,依次点击“安全设置→远端Web管理”,进入“远端Web管理”设置界面。接下来就可启用远程控制功能。默认情况下,路由器使用“80”端口来提供远程管理功能,但这非常不安全,容易被攻击者猜到。因此,可修改端口号,使用一个不常用的端口来提供远程管理功能,在“Web管理端口”栏中修改远程管理使用的端口号(如“8081”)。现在,攻击者就很难猜到端口号了。接下来,在“远端Web管理IP地址”栏中,输入可对路由器进行远程控制的公网计算机的IP地址。最安全的做法是允许某个使用特定IP地址的机器远程登录路由器,将该参数设置为管理员在总部使用的IP地址(如“10.254.*.*”)。现在只有该IP的主机能在公司总部的机器上远程登录路由器,而其他公网机器则不行。
关闭telnet命令登录,在大多数情况下,并不需要来自互联网接口的主动的telnet会话,如果开启了Web登录方式完全可以关闭该登录方式,减少被黑客攻击的可能性。禁用IP定向广播,IP定向广播使得攻击者对路由器实施拒绝服务攻击。因此要禁用,避免当攻击者不能登录路由器而采取DDOS攻击,因为一台路由器的内存和CPU难以承受太多的请求,这种结果会导致缓存溢出,从而路由器沦陷。同样的也要禁用IP路由和IP重新定向,因为重定向允许数据包从一个接口进来然后从另一个接口出去,攻击者可以把精心设计的数据包重新定向到专用的内部网路,危害内部网络的安全。
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stilcome01 2008-10-15 16:17

Suicide shocked

Korean Government intends to strengthen the legislative network management


Cui real suicide, the South Korean government and the ruling party that is in the process of revising the law to guard against the drawbacks of the Internet.


Korean Broadcasting Commission Communication on the 3rd, said: "To prevent anonymous way to the side effects of the Internet, starting in November from the implementation of the" Law of information and communication network so that the amendment "to increase the application of the 'restrictive system to confirm my' website."


I recognize the so-called restrictive system, refers to a portal, such as on-line message when I confirm the identity through the process. In other words, to be able to speak, but left a card number.


At present, "I confirmed that the restrictive system" applies only to the number of users on more than 200,000 (Media Network) and 300,000 (portals, video sites). However, in accordance with the purposes of the amendments made in the future will expand the scope of the Sun more than 100,000 users of the Web site for all operators.


South Korea Communications Commission also decided to broadcast as planned in the National Assembly on a regular basis, "Information and Communication Network Law," which includes strengthening the monitoring of on-line message to the operators to levy a fine, and so on.


Grand National Party members of Congress on behalf of the Hong Joon-pyo, said: "If you do not slander the introduction of online crime network and the real-name system, on-line defects caused by the malicious message will appear. On a regular basis through the National Assembly," Cui real law "."


Grand National Party of the Sixth Policy Coordination Committee chairman Na Kyung-won said: "The amendments to the" information network ", a compulsory requirement. Some people think that the Internet has brought loss and message requests on the Web site by the operator within 24 hours To take measures in this regard. "


In fact, this law is not the real-name system for the implementation of the network, but the network has been in place for many years the real-name system be strengthened.


The South Korean government in 2002 began to implement real-name system for the network. In March 2003, 9 government departments to implement the real-name system for Web site, at the end of the year expanded to all 22 departments. May the same year, the Ministry of Information and Communication and DAUM, Yahoo Korea, NHN and NEOWIZ 4 large portals, general manager of the forum will be held, and decided to actively promote the Internet real-name system.


By the end of 2006, the South Korean National Assembly passed the "promotion of the use of information communication network and personal information relating to the protection of the law" amendment to provide that the average daily traffic of more than 100,000 public authorities and portal site message board posted articles, photographs, Video content, and so on, must be my real name members to join. If the Web site in violation of the real-name recognition, will receive the information and communication minister to correct the order. If you do not comply with the order, shall be sentenced to 30,000,000 won (1 yuan or about 143 won) fine.
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stilcome01 2008-11-17 01:08

Obama as role model for black youth Not so fast

The election of the first black president in US history should send a powerful signal to young black Americans: If Barack Obama made it, so can you.


President-elect Barack Obama leaves a gym in Chicago November 15, 2008.[Agencies]

But some African Americans living in inner city Atlanta said that while Obama is a role model his life appeared so far removed from their own struggles that it was difficult to see how they could use it to spur their own success.

Others said that even something as momentous as Obama's election would not make it easy to acquire the self-belief that they needed to move forward.

"If Barack has made it into office there is no excuse to say that America is racist because he has proved that you can do something," said Lebron Cook, 22, who registered for the first time to vote for Obama on November 4.

Cook said he wanted to be a successful rapper and admired Jay-Z because he had made a transition from music stardom to corporate power. As an alternative Cook said he would also like to train as a pharmacist.

His dreams, though, looked tough to attain. After leaving school, Cook became homeless for several months and worked in what he described as a series of dead-end, low-paying jobs.

His father and other family members were in an out of jail and he is staying at a relative's home in the Bankhead neighborhood of Atlanta, where he said other young people sold drugs for a living.

"Drugs are everywhere," he said, adding that he lived on about $20 a week.

Cook's story typifies the obstacles faced by many young African Americans in inner cities. Poor schools, families that are often in disarray, drugs and violence impede success.

More than 20 percent of all black men born from 1965 through 1969 served time in prison by the time they reached their early 30s, said a study published in the American Sociological Association journal in 2006.

That figure soared for young blacks who had not been to college. By comparison, less than 3 percent of white men born in the same time period had been to jail, said the study.

"The only way that he (Obama) can make a substantial change is if he addresses things like poverty and joblessness and those deep pervasive factors that affect black boys and men," said film maker Byron Hurt.

IMAGE MATTERS

Hurt's latest film, "Barack and Curtis", is a 10-minute documentary released on the internet that compares the image projected by Obama with the image of Curtis Jackson, who is better known as the rapper 50 Cent.

The movie argues that Obama's image, as an educated, family man is a stark contrast with that of 50 Cent, who made an album called "The Massacre" and is famous in part for having been shot nine times in a gang-related incident.

Even though Obama's election was not a panacea for black men, the importance of the example he sets could not be underestimated, Hurt said in an interview.

"The boost that he has given black men is more symbolic than anything else," said Hurt. "But I don't want to undervalue symbolism and image. When I see images of Barack Obama in a baseball hat taking his daughters to school ... that is a powerful image."

Many black Americans said the election result overturned so many deeply held beliefs about the way America perceived its black minority, which makes up around 13 percent of the population, that it would take time to digest its impact.

But one immediate effect might be to make education and college seem a more viable option for African American young people, said Carla Stokes, founder of a group that works with black teenagers.

"He (Obama) has opened up the door to young black Americans to think that they can be something other than a musician or a sports star," said Stokes, president of Helping Our Teen Girls, a non-profit organization.

NOT WAITING

During the campaign, Obama repeatedly told black audiences about the importance of education, parental responsibility and homework, drawing frequent applause.

Jerrone Strickland, who goes by the name 'Lil Bankhead, said that while he supported Obama and saw him as a symbol of success he did not need him or anyone else to provide motivation for his dream of a career in the music industry.

Bankhead, a D.J. on the V-103 urban music station in Atlanta, said he networked relentlessly, made personal sacrifices and had worked long days and nights to teach himself the skills he needed for his career.

Self promotion and making the right contacts were paramount, he said, adding that a key role model was 50 Cent because he had made it as a rapper, crossed over into mainstream business and still remained true to his roots on the street.

"They (his black friends) can't sit back and say only a white man can be president. You can be anything you want to be -- don't let anybody tell you you can't," Bankhead said.

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