router cisco 2821

First, the experimental topologySecond, the specific configurationRouter (config) #do sh runbuilding configuration ... Current configuration:604 bytes!version 12.4no service Timestamps log datetime MSECNO service timestamps debug datetime MSECNO Service Password-encryption!hostname router!ip dhcp excluded-address 192.168.1.1!IP DHCP Pool ABCNetwork 192.168.1.0 255.255.255.0Default-router 192.168.1.1Dns-serv

1. Use the Cisco router Debug cable to connect the router's console interface and the computer's serial port, turn on the router after powering on, and then 1. In Windows XP, initial debugging via the HyperTerminal logon router, as shown in network topology 7-8650) this.width=650; "title=" QQ picture 20150320165214.png

that needs to be mapped to the Internet for access by others. The specific requirements are as follows:1. Only Internet users are allowed to ping the server and log on to the server through SSH;2. Only Intranet users are allowed to ping the server and log on to the server through telnet;3. Intranet users can access the Internet freely;4. The server cannot access the Internet.Step 1:First First, ensure that the server and PC can ping the gateway GW, then perform NAT on the GW, and ensure that t

When configuring the Cisco 3560 switch in the morning with the Cisco Packet Tracer practice, it is found that the IP address of the port cannot be configured in port configuration mode.Switch>Switch>enableSwitch#configure TerminalSwitch (config) #interface F0/1Switch (config-if) #?DhcpOnly DHCP commands are available. Check on the Internet, the original switch port is Switchport, that is, the two-layer swit

that needs to be mapped to the Internet for access by others. 650) this. width = 650; "border =" 0 "alt =" "src =" http://www.bkjia.com/uploads/allimg/131227/02223S615-0.jpg "/> The specific requirements are as follows:1. Only Internet users are allowed to ping the server and log on to the server through SSH;2. Only Intranet users are allowed to ping the server and log on to the server through telnet;3. Intranet users can access the Internet freely;4. The server cannot access the Internet.Step

Cisco router reset enable password tutorial, ciscoenable Steps: 1. Restart the vro and press ctrl + Breack when ROM Monitor mode appears on the vro to enter ROM mode, for example: 2. Modify the vro register value, change the original register value 0x2102 to 0x2124, and then run the reset command to restart the device, for example: 3. After the password is changed, the value of the drop register in

Cisco router startup process:(1) execute Bootstrap Loader in the ROM, which is similar to the BIOS in the computer and Bootstrap will install IOS into RAM;(2) IOS can be stored in many places (FLASH, TFTP server or ROM). The order in which the router looks for IOS images depends on the startup domain of the configuration register and other settings. Configuration

Cisco router register configuration objective: Register configuration is used to change the router startup process. The Start bit consists of four hexadecimal registers. The value range of 0 xABCD www.2cto.com ranges from 0x0 to 0 xFFFF 0x2102: Industrial default value 0x2142: starts from FLASH, but do not use the configuration file (for Password Recovery) in NVR

When a Cisco router forgets or loses the enable password, there are two methods to restore it, depending on the series of products you are using.Method 1Steps:1. Connect a terminal or a PC with simulation terminal software installed on the console port of the router.The default register value is 0x2102. The value ranges from the third digit to the left. If it is 1, it is disableBreak. If it is 0, the Break

Cisco router ACL wildcard192.168.1.20-192.168.1.50 range of networksA contiguous address, the form of a wildcard mask must be:11111111=25501111111=12700111111=6300011111=3100001111=1500000111=700000011=300000001=1For range 20-50, be sure to use Access-list 1 per 192.168.1.0 0.0.0.63, then go head to tail0-16 the maximum block address that can be contained is 16:access-list 1 deny 192.168.1.0 0.0.0.1516-19

) #interface gigabitethernet0/0.1Router (config-subif) #encapsulation dot1q 2Router (config-subif) #ip address 192.168.1.1 255.255.255.0DhcpWanglei (config) #ip DHCP excluded-address 192.168.1.1Wanglei (config) #ip DHCP pool dhcppool1Wanglei (dhcp-config) #network 192.168.1.0 255.255.255.0Wanglei (dhcp-config) #default-router 192.168.1.1Wanglei (dhcp-config) #dns-server 192.168.1.1Wanglei (dhcp-config) #dns-server 61.128.114.133Static NATRouter (confi

Router#show Run Building configuration ... Current configuration:1115 bytes ! Version 12.2 Service Timestamps Debug Uptime Service Timestamps Log uptime No service password-encryption Hostname Router ! No logging on Enable Secret 5 $1$OYEO$B.DP73YBQILQNQSUV/WMX1 ! IP Subnet-zero ! ! ! VPDN Enable ! Vpdn-group 1 Request-dialin-----request-dialin is for the client. Protocol PPPoE ! ! !

customized within a Network as needed without application. In the network, computers communicate through internal IP addresses. When the internal computer needs to communicate with the external internet, the device with the NAT Function (such as a router) converts an internal IP address to a valid IP address (that is, the requested IP address) for communication. 　　 2. NAT application environment 　　　　 Scenario 1: an enterprise does not want external n

Update the public ip address of the Cisco router. First, confirm how your network is going. Here we will talk about the configuration based on our network: first, remove the default route no ip route 0.0.0.0 0.0.0.0 xxx. xxx. xxx. xxx adds the new default route www.2cto.com ip route 0.0.0.0 0.0.0.0 xxx. xxx. xxx. xxx then remove the ACL to overwrite the no ip nat inside source list 1 pool BJ. RK overload re

Cisco router nat translation 1. One-to-one correspondence between the internal address and the egress address disadvantages: When the egress address resources are scarce, only a small number of hosts can be connected to the internet. 2. The internal address shares the egress address. The router uses the egress address and port number, as well as the external host