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Routers are packet forwarding devices that work in the third layer of the OSI Reference Model-the network layer. Routers implement network interconnection by forwarding packets. Although routers can support a variety of protocols (such as TCP/IP, ipx/spx, AppleTalk, etc.), most routers in China run TCP/IP protocol. Routers typically connect two or more logical ports identified by an IP subnet or Point-to-Point protocol, with at least one physical port. The router determines the output port and t
Cisco Catalyst Switch configuration and maintenance method. Today's Catalyst Switch topic discusses the introduction of the History st6000 series and the introduction of the Catalyst Switch 5000 Series. There is no difficulty. Hurry into the Wireless World. LAN switches have evolved from a HUB-based LAN shared in the traditional sense to a broader space. Take Cisco's ipvst5000 series LAN switch as an
Cisco's Internet Operating System IOS) is a complex operating system optimized for the Internet. There are many IOS skills on the Internet, but most of the best skills are not enough to form a complete article. Today, I want to use one of the Chinese IT labs to describe five tips for using Cisco IOS. I believe these skills will definitely make the network administrators work more efficiently. Tip: simplify command input It can be asserted that almost
Basic information of the network The network topology is: The central switch uses Cisco Catalyst 4006-s3,supervisor Engine III G engine in the 1th slot, for three-layer exchange, 1 24-Port 1000base-t module in the 2nd slot, for connecting to the network server; The 1 Block 6 Port 1000base-x module is located in the 3rd slot for connecting 6 backbone switches. One switch uses Cisco Catalyst 3550-24-emi and
address 172.16.39.2 255.255.255.0 Ip nat inside ! Router VPN 1 Redistribute static Network 172.16.0.0 Default-metric 10000 100 255 1 1500 ! Ip route 172.16.255.0 255.255.255.0 Null0 Access-list 1 permit 10.0.0.0 0.20.255.255 ! End In our example, the Cisco WAN router runs a policy route to ensure that the I P packets are sent to the firewall. Two net-10 policy rules are defined in the
Huawei router and the same class Cisco router in the functional characteristics and configuration interface is completely consistent, some aspects also according to the needs of domestic users made a good improvement. For example, in English and Chinese can be switched configuration and debugging interface, so that use
understanding the Spanning Tree principle, we can have a specific purpose. The command to reconfigure the Cisco router is as follows: DispatchA # config terminal ! Select the ieee stp Spanning Tree Protocol. DispatchA (config) # bridge 1 protocol ieee ! Select the router at the master scheduling end as the root bridge. DispatchA (config) # bridge 1 priority 0 DispatchA (config) # interface ethernet0/0 DispatchA (config-if) # bridge-g
. Configure writable Community. The default product writable Community name is private. Switch (config) # snmp-server community private rw 3. Change the SNMP Community password. A. Group devices and enable various Supported SNMP versions Switch(config)#snmp-servergroupqycx123v1 Switch(config)#snmp-servergroupqycx123v2c Switch(config)#snmp-servergroupqycx123v3noauth B. Configure read-only and writable community respectively, for example
, reducing network complexity and improving server management capabilities and large-scale scalability. Each UCS rack server is equipped with a VIF interface card that provides two Gigabit Ethernet interfaces. using Cisco Network virtualization technology, it provides both management network interfaces and operating system network interfaces. FI is the old version of 6120, which is inconsistent with the new server version. Therefore, you need to set a
Overview of LAN switches LAN switches have evolved from a HUB-based LAN shared in the traditional sense to a broader space. Take Cisco's Catalyst 5000 Series LAN switch as an example. It includes an integrated switching hardware structure, 10-Mbps Ethernet that supports switching, and-Mbps Fast Ethernet, supports fast Ethernet, FDDI, exchange-type ring, and layer-3 switching processing. This type of switch can provide exchange access to workstations,
Note: Intranet port: 192.168.3.253 External Network port: 192.168.6.45 (The following instructions are accordingly)!!!Join VLAN in interface mode:Switchport Access VLAN 2VLAN interface Configuration IP Address:Interface Vlan1Nameif insideSecurity-level 50IP address 192.168.3.253 255.255.255.0To configure Port mappings:access-list outside_access Extended permit IP any any to create an access control listaccess-group outside_access in interface Outside
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] NAT configuration full guide vronat NAT Function configuration introduction with the rapid development of the internet, the shortage of IP addresses has become a very prominent problem. A variety of solutions have emerged to solve this problem. The following describes an effective method in the current network environment: address translation (NAT. 1. NAT
This article describes in detail how to configure the NTP time synchronization server, and takes CISCO 7200 as an example. I hope this article will help you. For the purpose of network management, we set up netflow to monitor traffic and obtain detailed access records for Intranet users to access the Internet. Such records can be accurate to seconds, the premise is that the time of the monitored vro or vswi
complete, you can use the "show vlan #" command to display a specific vlan information and verify VLAN parameters. For example:Switch # show vlan 3 2. configuration of multiple switchesTo allow a VLAN to span multiple switches, you must configure the trunk (trunk) to connect to these switches. Cisco requires that trunk protocols such as ISL be used on such trunk links, so the command to enable trunk protoc
EnConf tHostname Cisco3800Interface Loopback0IP address 6.6.6.6 255.255.255.0Interface fastethernet0/0Description WANIP address 119.200.27.50 255.255.255.252IP Nat ousideInterface FASTETHERNET0/1Description LANIP address 192.168.6.1 255.255.255.0IP nat InsideIP Route 0.0.0.0 0.0.0.0 113.200.27.49 Telecom Unicom Next hopIP Route 192.168.3.0 255.255.255.0 192.168.6.2IP Route 192.168.4.0 255.255.255.0 192.168.6.2IP nat Pool www 119.200.27.50 119.200.27.55 netmask 255.255.255.252IP nat inside source
Configure the PPPoE configuration for connecting a CISCO router to an ADSLmodem through the PPPoE configuration: hostnamebjsite! Ipsubnet-zeronoipdomain-lookup! Vpdnenablenovpdnlogging! Vpdn-group1request-dialinprotocolpppoe! Interfaceethernet00ipaddh Configure PPPoE for connecting a CISCO router to an ADSL modem using
An instance of VLAN configuration for Cisco L3 switches and L2 SwitchesCisco VLAN implementation is usually port-centric. The port connected to the node determines the VLAN in which it resides. There are two ways to allocate a port to a VLAN: Static and Dynamic. The process of creating a static VLAN is to forcibly allocate the port to a VLAN. That is, we first create a VLAN on The VTP (VLAN Trunking Protoco
In the network operation, we will often take over some of the second-hand equipment, interface configuration needs to restore factory settings. I'll share it with the guys today. The Cisco Device Interface Configuration Cleanup command The default interface interface ID number, here is a Cisco router for
PrefaceThis article is based on the actual Linux management work, the actual process of using SSH certificate login In the example, explain the configuration principle of SSH certificate login, based on the principle of configuration, solve the problems in actual work, using
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