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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
It is useful to know about Cisco router configuration. Here we mainly explain the specific steps of Cisco router configuration. Cisco routers once dominated enterprise wide area network applications. However, according to the CCID report in recent years, huawei and
Simply record that a Cisco router is simulated as a frame relay switch, and the router must have a serial interface module. Liehuo.net // Enable Frame Relay switching on the vroFRSW (config) # frame-relay switching strong-fire-network // Enter the Interface Configuration ModeFRSW (config) # int serial 0/1 Veryhuo.com // Delete the interface IP AddressFRSW (
The user checks network security and requires SSH logon to the core device. Previously, the device used Telnet logon, and the user name and password are transmitted in plaintext, which does not meet the security check requirements. In fact, the SSH login configuration is very simple, mainly divided into the following steps: 1. Configure the Domain Name Sd_core_r7600 (config) # IP domain-name sdcore 2. generate an SSH key Sd_core_r7600 (config) # crypt
How to configure remote logon for a Cisco router IP Address Configure the vro IP Address Run the command ip address x. x to configure the ip address. The command is as follows:Router2800> enable (in privileged Mode)Router2800 # configu
The Cisco router switch sets automatic backup for IOS files and restores the automatic backup and rollback of Cisco IOS configuration files. The archive configuration mode function of IOS is required. Generally, only IOS versions 12.3 (4) All commands for automatic backup of the Cisco IOS configuration file are as foll
This article describes in detail how to intercept TCP, introduces the principle of intercept, and introduces precautions. I believe this article will benefit you a lot. As mentioned before, during the three-way handshake of TCP connection, the first packet sent from one party to the other sets the SYN bit. When a device receives the initial packet of a request service, the device sends back a packet with SYN and ACK bits and waits for the ACK response from the source. If the sender does not repl
Using putty to connect and configure key authenticationFirst step: Download putty650) this.width=650; "Src=" https://s5.51cto.com/wyfs02/M02/08/B5/wKiom1nl9xqQm_l4AADW-qApWM8405.jpg-wh_500x0-wm_ 3-wmp_4-s_2786509660.jpg "style=" Float:none; "title=" qq20171017201951.jpg "alt=" wkiom1nl9xqqm_ L4aadw-qapwm8405.jpg-wh_50 "/>Download. zip 64-bit PC 32-bit
This article describes in detail how to configure an ACL from the basic concepts, usage principles, and access time. If someone says that a route switch device is mainly used for routing and switching, it must be a layman only when it is used for routing and switching data packets. We can use a common HUB only to exchange data packets. If we only use the routing function, we can select a WINDOWS Server for remote routing access configuration. In fact,
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 ! ! !
This article describes in detail how to configure PPP authentication and CHAP authentication, and provides the command line for configuration. You can learn about the configuration process through the instance. When configuring PPP verification, select PAP and CHAP. PAP is the user name and password for the plain text transfer, which is not secure. CHAP uses hash values for verification. Passwords are not transmitted online, so the security is high. C
stopped due to timeout and the user needs to authenticate again. The RADIUS server is required to configure 802.1x on the switch. Note that AAA can be implemented using RADIUS and TACACS +, but 802.1x only supports RADIUS Authentication. Let's take a look at the Configuration: Config) # aaa new-model 'start AAA. Config) # radius-server host 192.168.1.100 key netdigedu
Implementation of ADSL access using the cisco 2500 router Description: This case is Beijing Telecom's adsl PPPoE access. A common adsl modem and a cisco 2500 router (dual Ethernet port) are required, and IOS 12.2 (15) t, can achieve LAN Internet sharing. in this case, the co
When I got up this morning to go to the forum, I saw a post. Ask how to solve the following problem? A Cisco three-tier switch divides 3 VLANsVLAN 2:IP 192.168.1.1 255.255.255.0 192.168.1.254 Network SegmentVLAN 3:IP 192.168.2.1 255.255.255.0 192.168.2.254VLAN 4 IP 192.168.3.1 255.255.255.0 192.168.3.254Each VLAN can communicate with each other.Now add 1 Cisco routes to achieve shared Internet accessCisco
each entry, and rearrange the order of each access-list of the access list according to the matched number from large to small, which reduces the access-list of the message in the Access list. Reduce the time of specific packet lookup access list, reduce the burden of router CPU. It is important to note that the Access-list 100 uses the keyword "established" At the end, which is used by the Cisco
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