Harding Cisco Router

Topics: Cryptography, Internet Protocol, Cisco Systems Pages: 3 (675 words) Published: May 10, 2013
Securing routers
Routers are the basic level of the Internet. It is responsible for the communication through the network, between computers and servers. It is important to secure the routers so the attackers can’t gain information from the routers. There are many ways of securing the routers such as upgrade the operating system, warning banners and disable unneeded services.

Hardening cisco routers
Upgrade IOS
One of the important parts of securing routers is to choose the right router operating system. Users can check for the latest version of IOS in the cisco website. Also, it is necessary to check for IOS update because the company fixes flaws in the IOS version.

Password Encryption
Cisco routers have password configuration file. There are three methods of indicating password, which are clear text, Vigenere encryption, and MD5 hash algorithm. These passwords methods help to secure commands which router send it through the network. Vigenere and MD5 are better in encrypted commands than clear text. In addition, cisco routers use strong MD5 encryption. Then it will be hard for the attackers to gather information. When using clear text it is easy to gather the commands by the attacker because it shows the commands. This is example of clear text. enable secret 5 $1$Guks$Ct2/uAcSKHkcxNKyavE1i1

enable password enable-password
username jdoe password 0 jdoe-password
username rsmith password 0 rsmith-password
line con 0
exec-timeout 5 0
password console-password
login local
transport input none
line aux 0
exec-timeout 5 0
password aux-password
login tacacs
transport input none
line vty 0 4
exec-timeout 5 0
password vty-password
transport input ssh

Disable unneeded services
There is lots of cisco services are enabled by default on cisco routers. It is important to disable these services because the attackers use them for their need. According to Device Resiliency and Survivability “These are the services that...
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