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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 extent of its harm is self-evident.
1. One Sec
that can still store data after the system is restarted or shut down. Flash stores IOS in use. In fact, if the Flash capacity is large enough, you can even store multiple operation systems, which is very useful for IOS upgrades. If you do not know whether the new version of IOS is stable, you can retain the old version of IOS after the upgrade. When a problem occurs, you can quickly return it to the old version of the operating system to avoid long-term network faults. 3. non-volatile RAM (NVRA
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 provided by the
access the internal network server after the firewall is installed. To ensure that P2P tools such as BT are not restricted and can be downloaded smoothly to the maximum extent, we need to enable the DMZ function to set up a buffer between a non-security system and a security system, this buffer zone is located in a small network area between the internal network and the external network.
Application point of view: introduces
The vro.
It is quite dangerous to allow hackers to access the vro configuration page at will, because once the anti-spam and anti-virus configurations of the vro are changed, the user loss will be extremely high. In addition, hackers can attack devices connected to routers, such as PCs or laptops. Rateliff vividly said: "This is equivalent to giving the key to the hacker after the door is locked ."
Fortunately, this vulnerability occurs only when the user closes the firewall. Due to the improve
CISCO PT Simulation Experiment (13) router RIP dynamic routing configurationExperimental Purpose :The configuration method of mastering RIP Dynamic route selection protocolMastering RIP routing descriptions in routing tablesFamiliar with the principle and process of Routing and Packet forwardingExperimental Background : The company is connected to the export route
Many friends who use the Cisco router module have encountered many problems during use. Below are some basic solutions. More or less can solve some small problems. Problem description: The Cisco router module does not turn on the light, and does not turn on the light after i
username BluShinRouter (Config) # ip ftp password 4tppa55w0rdRouter # copy startup-config ftp: 9. promptly upgrade and patch IOS software. Ii. vro Network Service Security Settings 1. disable CDP (Cisco Discovery Protocol ). For example, Router (Config) # no cdp run Router (Config-if) # no cdp enable www.2cto.com 2. Disable other TCP and UDP
layer (layer 2nd) that occurred on the router D-Channel ISDN interface
Debug PPP shows the business and exchange information that occurs in the implementation of PPP
Delete Deletes files
Deny sets a condition for a named IP ACL
Dialer Idle-timeout
Specify the length of idle time before the line is disconnected
Dialer map sets a serial interface to call one or more locations
Dialer Wait-for-carrier-t
CISCO PT Simulation Experiment (11) router single-arm routing configurationExperimental Purpose : Master The configuration method of single-arm routingImplementing different VLANs to communicate with each otherIn-depth understanding of VLAN communication Principles and routing sub-interfacesExperimental Background :the company's technical and sales departments in different offices, technical department and
By David Davis CCIE, MCSE + I, scsa | more from David Davis CCIE, MCSE + I, scsa | published: 5/26/05Category: Home | audience: Networking Communications
Takeaway:It's critical that all devices on an organization's network display the accurate time and date. if they don't, things can go wrong in a hurry. david Davis explains why Cisco devices need to use Network Time Protocol (NTP) for their time synchronization needs, and he tells you how to configu
Dynamic and robust routing is extremely important for Internet networks. Therefore, any network engineer who is first involved in this field must not only understand the concept of routing, but also be able to control it in a real environment. However, the products provided by high-end network equipment suppliers such as Cisco in the routing field are all over the world. This means that most people can only learn routes in school or laboratory environ
packets to pass through by default. The second method modifies the default value of the router, change it to the same default as the CISCO device to block all packets.
1. Add ACL rules directly
After setting all the ACL statements on the Huawei device, use "rule deny ip source any destination any" to discard packets that do not comply with the rules.
2. Modify the default settings
Nbsp; Use "firewall defa
Netizens have their own preferences for Cisco router simulation software. The following describes three software models. I hope you can give it a try and give it a better reference to more friends. Everyone should know that the price of a router is very expensive, and it is very expensive to build a router lab.
Howeve
occur. Check the port configuration and route configuration of Cisco 3640, and find that the port IP address is configured normally, but there are two routes in the route list:
Ip route 0.0.0.0 0.0.0.0 192.168.10.2
Ip route 0.0.0.0 0.0.0.0 10.255.12.254
Because the Department's network is the lowest subnet in the Unit's Wan, the whole unit's Wan is accessed according to business needs, and the Department's
4tppa55w0rdRouter#copy startup-config ftp:
9. Upgrade and patch IOS software in a timely manner.
Ii. vro Network Service Security Configuration
1. disable CDP (Cisco Discovery Protocol ). For example:Router (Config) # no cdp runRouter (Config-if) # no cdp enable2. Disable other TCP and UDP Small services.Router (Config) # no service tcp-small-serv
patch IOS software in a timely manner.
Ii. vro Network Service Security Configuration
1. disable CDP (Cisco Discovery Protocol ). For example:Router (Config) # no cdp runRouter (Config-if) # no cdp enable2. Disable other TCP and UDP Small services.Router (Config) # no service tcp-small-serversRouter (Config) # no service udp-samll-servers3. Disable the Finger s
, you only need to set the gateway to point to the Ethernet port 192.168.0.3 of the router, and saves two valid IP addresses available for your own freedom, such as setting up your own WEB and E-MAIL server ). But there are also disadvantages: you cannot enjoy the CACHE service provided by the proxy server to speed up access. Therefore, the Cisco router NAT solut
The market demand for Cisco routers has been very high. Here we mainly analyze the detailed knowledge of Cisco router configuration and RJ45 console connection, for accessing and configuring I0S on a new router, we must communicate with the Console port.
After connecting a console terminal with the Console port configu
are clearly printed on the surface of the WRT320N wireless router. The leading Signal Indicator enables consumers to intuitively understand the working status of the device, when WRT320N is working, the indicator will flash accordingly. The WPS button in the middle allows you to set up an encrypted wireless network with one click to protect your wireless network. Cisco WRT320N provides a WAN port and four
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