cisco router troubleshooting commands

an access list and apply the list to an interface. If the access list from any application to an interface is not a ready-made access list, the list does not filter traffic. The access list is designed to filter traffic through routers. Does not filter traffic generated by the Cisco router ACL. Place the IP standard access list as close as possible to the destination address. Place the IP address extended

Cisco router Startup ProcessThe Startup Process of a Cisco router is divided into four main stages: 1. execute POST 2. load the bootstrap program 3. search for and load Cisco IOS software 4. find and load the startup configuration file, or enter the setup Mode 1. executing P

The question about the Cisco router interface is described in the following four steps. Based on the demonstration in the image, I believe that we should be able to clearly understand the question about the interface. You can configure a serial interface through a virtual terminal. to configure a serial interface, follow these steps: 1. In Global mode, enter the command "interface serial 0" to enter the ser

tech supportCommand output to display potential problems and repair methods. To use this information, log on and enable it, but you must be a registered user. Command Description Show version The earliest command in Cisco IOS (r) software version 10.0.Show versionThe EXEC command displays the system hardware configuration, software version, name and source of the configuration file and software image, the running time of the

When we want to perform permission rating management on a Cisco router or switch, it is often necessary to assign different levels of users a command that exceeds the default settings, such as show run, which is the most basic troubleshooting command.However, the command cannot be executed when your user level is at 0-14. You can assign permissions to these users

Test environment: Cisco Router Intranet interface F0/1:192.168.1.1 255.255.255.0 External network Interface f0/0:10.0.0.1 255.255.255.0 Server ip:192.168.1.100 First configure on the router: Router>en #进入特权模式 router#conf T #进入全局配置模式 Enter configuration

1. Commands supported by the switch:Switch Basic Status:Switch:; Rom status, router is rommon>hostname>; user modehostname#; privileged modeHostname (config) #; global configuration modeHostname (CONFIG-IF) #; interface StateSwitch Password settings:switch>enable; Enter privileged modeSwitch#config terminal; Go to global configuration modeSwitch (config) #hostname, set the hostname of the switchSwitch (conf

In recent years, the computer network, especially the Internet development is very rapid, ATM and IP over DWDM technology development so that the network transmission bandwidth quickly increased. While the development of network security and management technology is relatively lagging behind, although the voice of network security is high, but really fall to actually few. It is often believed that increasing the security mechanism of the enterprise network requires the addition of firewalls, aut

Global debugging When configuring a Cisco router, the boundaries between global and interface commands are obvious. In this case, we use "Global" to identify commands that cannot be used for interface debugging or specific transmission media types and Protocol debugging. For example, in vrouters 2500, you can use Debug

Cisco router Tcl script backdoor 2nd tests Author: Vic The security of Cisco routers is certain. Password verification is required for remote login. The Cisco passwords are encrypted in the following ways:1 not encrypted, plaintext display 650) this. width = 650; "border =" 0 "alt =" "src =" http://img1.51cto.com/attac

A Cisco router is detected infected with a secret backdoor. Security company FireEye researchers reported that backdoor programs called SYNful knock were found on 14 Cisco routers in 4 countries. Cisco has confirmed this. The attack does not take advantage of the vulnerability of the product itself, but requires valid

explains in Deph how it's simple Send C Ommands to your Cisco Router/switch via SNMP. With this feature it's possible configure the device or reload it (it is dangerous)! Author Fabio semperboni tags: advanced configuration, ios, reload, snmp, Tipsrelated PostsHow to install the Cisco ISE using USB or CIMC interface How to access network devices via Radius serve

RIP and IGRP are commonly used router configuration protocols. What problems should we pay attention to when configuring RIP and IGRP? What should we do? The following configuration steps provide detailed answers. RIP Protocol RIP (Routing information Protocol) is an Internal Gateway Protocol (IGP) that is widely used earlier and is suitable for small-sized similar networks, is a typical distance-vector protocol. For more information, see RFC1058 an

-->Protocol [ip]: [Protocol-Type] Target IP address: IP-Address Repeat count [5]: Datemedisize [100]: Timeout in seconds [2]: Extended commands [n]: y Command-->Sweep range of sizes [n]:Tracke usage:Router # trace IP-Address [Host-Name]Specify the media type for the Cisco 4000 vro:Router (config-if) # media-type 10 baset Router (config-if) # ^ zChange the vro sta

NAT configuration on a CISCO router is in full swing and causes the shortage of IP addresses. to alleviate this problem, an important application is NAT (Network Address Translation ), it is widely used. Through address translation, NAT enables enterprises to access the Internet by using only a small number of valid IP addresses on the internet, effectively alleviating address insufficiency, at the same tim