cisco sec

I will talk about two tips, one about monitoring switch port traffic and the other about store value. 1. Monitor switch port traffic Switch monitoring document in the production environment on the Internet. Therefore, it is complete, and a key knowledge is interspersed in the middle. Zabbix is still innocent .!!! In this demonstration, I used the production environment Cisco 3750 switch !!! (Only 3750, no other products) ZABBIX details: click hereZABB

the actual MAC address of the client sending the request message.Attackers can use MAC spoofing to send DHCP requests. However, this attack can use the port security feature of the Cisco switch.To prevent. Port Security allows each Port to use only a unique MAC address. However, if the attacker does notModify the source MAC address of the DHCP request packet, but modify the CHADDR field in the DHCP packet to perform the attack.It does not work.Becaus

backplane (such as Catayst 5500 and 6000). bid High-byte domain is the bridge priority, do not confuse the bridge priority and the seventh chapter "Advanced Spanning Tree." The port priority discussed, the bridge priority is a two-byte (16-bit) value, an unsigned 16 is an integer with 216 possible indications, and the range is 0-65535. The default bridge priority is the median value of 32768, which is described using the 10 binary. Note:This book covers only the version of the IEEE Spanning

Cisco Systems®Multi-Service routers and Integrated Multi-Service Router series media verification and encryption features ensure that voice sessions are not affected by eavesdropping. Cisco's Unified Communication System consists of voice and IP communication products and applications, enabling organizations to communicate more efficiently-helping them streamline business processes and immediately obtain support for appropriate personnel and resources

Cisco disables Some uncommon Services 1. Cisco Discovery Protocol CDP is a Cisco dedicated protocol that runs on Layer 2 of all Cisco products, shared basic device information with other directly connected Cisco devices. Independent of media and protocols. Hackers can use CD

For many years, Cisco PIX has been a firewall established by Cisco. In May 2005, however, Cisco launched a new product, the Asa,adaptive security appliance, as an adaptive safety product. However, PIX is still available. I've heard a lot of people asking about the difference between the two product lines on a number of occasions. Let's take a look. What is

For many years, Cisco PIX has been a firewall established by Cisco. In May 2005, however, Cisco launched a new product, the Asa,adaptive security appliance, as an adaptive safety product. However, PIX is still available. I've heard a lot of people asking about the difference between the two product lines on a number of occasions. Let's take a look. What is

This article describes how to make the right choice for a CISCO router. Here I will share some of my experiences in choosing a Cisco router. It may be helpful to everyone. When deploying a LAN, A vro is one of the essential devices. Cisco is the leader in the field of routers and other network equipment. He is also a brand that many network administrators must co

When routers and switches work normally, you do not need to worry too much about wiring issues. However, when the network encounters problems or changes, wiring knowledge may be of great help to you. In this article, we will introduce you to some basic wiring knowledge, and describe the details of the Cisco console dedicated network cable. The network cable belongs to the first layer of the Network: physical layer. Only the correct network cable can e

Visio OS opera linux ieCisco Systems IOS is vulnerable to a denial-of-service attack using ICMPRedirect messages.When flooded with ICMP redirect messages, the IOS uses up all its memoryTo store the new host routes. The device is then unable to performOperations that need additional memory such as processing ing routing updatesAnd accepting inbound telnet (1) connections.DETAILSKnown vulnerable combinations:* Cisco 1005 with IOS 11.0 (18)*

For the Cisco router security configuration command family, the following are 10 configuration commands, which are expected to be good for everyone. When talking about configuring a new Cisco router, most configurations depend on the type of the router and the purpose of the service. However, each administrator has his/her own command list for configuring each router correctly. I will share with you the lis

The modular stackable cisco Gigabit Switch is classified. The cisco Gigabit Switch meets the requirements through different settings. The following describes the specific requirements. In fact, a high-speed stacked port is a basic feature of a cisco Gigabit Switch that can be stacked. Modular cisco Gigabit Switch With

To select a cisco Gigabit Switch, You need to refer to vlan support. The choice of a cisco Gigabit Switch is a common problem. To measure the cisco Gigabit Switch, you need to pay attention to after-sales service and vlan support, MAC address count and other factors. Vlan support Vlan is a virtual LAN. Through vlan support, it can prevent the LAN from generating

The Cisco PIX 501 firewall provides enterprise-class security for small office and remote workers through a reliable, Plug and Play security device. The Cisco PIX 501 Firewall is part of the market-leading Cisco PIX Firewall series that delivers powerful security features, small office networking, and powerful remote management capabilities, especially for the se

1. background for Cisco devices and Microsoft Systems Integration:Within the company there are a number of clients, in order to achieve harmonization, in the management of the internal deployment of domain architecture, so that through Group Policy to the clientmake batch management, improve the efficiency of management. the same company has a certain number of network equipment (switches, routers, firewalls, etc.),in remote management, it is throu

Cisco device configuration files are backed up regularlyI. Needs and coping strategiesIDC machine Room Several switches and firewall equipment, because of business needs, often on the switch or firewall to modify the configuration file, although the Cisco device stability is good, but do backup, can just in case.There are many articles on the web that are regularly backed up by

valuable documents, once stolen, the loss will be immeasurable, so they decided to use the way of tendering, to their own network to buy a "door", all hidden dangers are "shut out ”。 From buying "doors" to buying ideas As we all know, the most secure "door" that is now used is the firewall. The ocean wants to filter suspicious information by adding a firewall between their intranet and the external Internet. Ocean's bidding activities attracted 5 domestic and foreign well-known security solutio

In order to allow Cisco switched remote connections to the security of the account password improved, you can use SSH to connect the terminal, but many factory switches default iOS is not supported by the SSH feature, in order to enable Cisco switches to support SSH, must upgrade with "K9" iOS. The following is the factory Cisco 3750g-24ts default iOS screenshot

Welcome to the network technology community forum, and interact with 2 million technical staff to enter the settings and skills of the two CISCO switches, mainly: Cisco switch setup skills to find the MAC address corresponding to the IP address, cisco switch setup tips: Find the port corresponding to the MAC address on the switch. The IP address of a machine is k

When using a cisco router as an Internet Router, cisco's IP packet filtering function is generally used to count IP traffic. The method is to add the ipaccountingoutput-packets command at each entrance of the cisco router. The cisco router automatically counts the IP traffic of these ports. Common snmp or telnet terminal simulation (showipaccount) methods to obta