used cisco router

router. 1. Security Testing I installed sniffer locally and used Telnet to log on to the Cisco router. Stop sniffing and decode it. 1 shows that the user logs on to the vro in user mode and global mode. The entered passwords are displayed in plain text. Although the password is split into two parts, an experienced att

Many junior network administrators ignore security settings when using Cisco routers, and the following three are ideal for novice users to configure network security when using Cisco routers. One, the security configuration of the router "access control" 1, the administrator who can access the router is strictly con

as a TFTP server rather than a TFTP client. The outbound file directory must be specified. A Cisco IOS software image is saved in this directory (see step 2 below). Most TFTP applications provide installation of general programs to assist these configuration tasks. Note: The software features CD-ROM includes a TFTP server that can be used on PCs running Windows 95, Windows 98, NT4.0, and Windows 2000. Fo

save log information to other locations, you can use other parameters of the logging command, this will be briefly introduced in the future. If this command is not executed, Cisco IOS only sends the log information record to the Console line. The router can also send log information to the VTY line. By default, the Cisco IOS device does not send the log informat

to the router R2 and R3. Run the show IP protocols command to view information related to the running status of the routing protocol. If Automatic summary is not disabled, a route entry to null0 is displayed in the routing table. You can disable automatic summary with no auto-summary. First int S0/0/0, and then bandwidth 64, you can set the synchronous routing bandwidth on this port to 64, which does not affect the Internet bandwidth.

the "connect to use" column, and click OK. In the pop-up "COM1 properties" form, you can easily collect IP traffic without any programming. For security reasons, you can also restrict access to the server's clients .. 2. obtain IP traffic of a cisco Router After the configuration is complete, turn on the vro power and the startup information of the vro appears. In this case, you can operate the vro as you

A Cisco router is a commonly used routing product in large and medium-sized networks. As a core router, It is the soul of the entire network. If the Administrator is improperly set, the security deployment may be taken over by attackers if it is not in place. In that case, all the networks under it will fall, and the e

A Cisco router is a network device that connects multiple networks or CIDR blocks. It can translate data from different networks or CIDR blocks ", so that they can "read" each other's data to form a larger network. A vro consists of hardware and software. The hardware is mainly composed of physical hardware and circuits such as the central processor, memory, interface, and control port. The software is main

This article describes how to configure the IOS Firewall on a Cisco router. What should we pay attention to when configuring the firewall? The following article provides detailed answers. Pre-configuration on R1, R2, and R3 R1 (config) # int e0/0R1 (config-if) # ip add 172.16.1.1 255.255.255.0R1 (config-if) # no shR1 (config) # ip route 0.0.0.0 0.0.0.0 172.16.1.2 configure Static RoutingR1 (config) # ^

Cisco shuts down some infrequently used servicesOne, Cisco Discovery ProtocolCDP is a Cisco private protocol that runs on the second tier of all Cisco products and is used to share basic device information with other directly conn

principle, using a Udpecho request instead of a ICMPECHO request to initiate an attack. While cyber security experts are focused on developing devices that block Dos attacks, they have little effect because Dos attacks exploit the weaknesses of the TCP protocol itself. Properly configured routers can effectively prevent Dos attacks. In Cisco routers, for example, the iOS software in Cisco routers has many

Currently, Cisco access routers are widely used, and the features of media verification and encryption are one of the features of Cisco access routers. So I studied how to use the secure RTP media verification and encryption features, I would like to share it with you here and hope it will be useful to you. The media authentication and encryption features provide

following command: Global mode: from privileged mode, we can enter global mode. In this mode, you can change the entire configuration of the vro. If you need to change the configuration, you need the following command. This is an example of how to enter the global mode. By default, if you do not set a password for the Cisco vro console, you can access the user mode. If you do not set a password in other modes, you will go to the next mode ). You can

For the Cisco router security configuration command family, the following are 10 configuration commands, which are expected to be good for everyone. When talking about configuring a new Cisco router, most configurations depend on the type of the router and the purpose of the

people at the same time. Therefore, in some Chinese cities, the operator binds the MAC address for the first dialing, when you change the number, you need to call the carrier. The reason is that you can change the network card. Do not say that you cannot dial the number with a vro.Third, do you have a friend who accesses the Internet through a router? You can refer to their configuration, provided that the same carrier is

When using a cisco router as an Internet Router, cisco's IP packet filtering function is generally used to count IP traffic. The method is to add the ipaccountingoutput-packets command at each entrance of the cisco router. The

the technical assistance center and send the obtained information to trained staff. Remember that the core dump information must be saved when the router crashes. After the vro is restarted, such core dump information does not exist. Important troubleshooting commands used when a router crashes Before learning how to configure the core dump information, let's ta

. Most enterprises still accept it. Therefore, it seems that Cisco routers are very expensive, mainly because we are too concerned about Cisco's high-end products. Experience 1: Rough frame first Although Cisco has a long product line, there are a wide variety of product types, and there is no way to get started. However, I think it is a good practice, that is, to distinguish different products by series. E

Affected Systems: Cisco IOS 9.14 Cisco IOS 12.0.7 Cisco IOS 12.0.6 Cisco IOS 12.0.5 Cisco IOS 12.0.4T Cisco IOS 12.0.4S Cisco IOS 12.0.4 Cisco