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Reasons and solutions for the loss of network card of Linux virtual machine under Hyper-V virtualization The company has implemented virtualization, all using Microsoft Windows R2 Enterprise with Hyper-V makes the cluster run Hyper-V virtual machine. This is a good thing, save resources, centralized management, power saving, deployment ultra-fast, the key is to live migration. We use the Dell Md3000i enclosure as a clustered shared disk, which is iSCSI-based Gigabit Ethernet network storage, a

In actual cases also encountered this kind of problem, the customer intranet has a server map on the Internet, extranet user access Global-ip no problem, but intranet users want to access Global-ip will not pass, typical is the user will intranet server made public network DNS a record, Both internal and external networks are accessed through domain names.JUNIPER series equipment including NETSCREEN/ISG/SSG no such problems, directly through the ordinary dip can be achieved, the subsequent produ

Security is critical for Linux/unix production servers and is a basic lesson for every system administrator. This article is "Plainly your Linux Server" series of the fourth, all listed below is about the basic Linux server settings, and strive to use the simplest language to explain the basic Linux server security settings, especially for the novice, if the security of the Linux server has higher requirements, It is recommended to work with a hardware firewall.First, the hardware protection of

-capturing groups (?:), such as:var c= "a001"; /A (?: \ d*)/.test (c); Console.log (regexp.$1); Empty(3): Parentheses in the grouping, you can use a qualifier on the character combination, and then can follow the number of times, such as: (a\d) {2} match a3a5(4): Select one of the multiple direct quantities in the group. For example: g (a|a) Y, but this situation is faster with g[aa]y(5): When there is a nested parenthesis in the pattern, the number of the variable is done one at a time as the

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Pierson said that multiple logon failures could also mark an attack and check for logins that use Non-existent user accounts, which usually indicates an attempt to guess the user's account information and to obtain authentication. Similarly, trying to get a successful login at work time may also indicate that this is not true for employees accessing data. Companies should investigate this. 5, the volume of database reading surges When an attacker invades an enterprise and tries to ooze inform

The reason and solution of the problem of Linux virtual Machine network card losing under Hyper-V The trend of virtualization The company implemented virtualization, all using Microsoft Windows 2008 R2 Enterprise with Hyper-V to do cluster run Hyper-V virtual machines. This is a good thing, save resources, centralized management, power saving, deployment super fast, the key is to be able to migrate in real time. We use the Dell Md3000i enclosure as a clustered shared disk, a Gigabit Ethernet

that the device in your local area network is safe and effective. Unfortunately, Microsoft's software engineers are still not implementing it in the system, even though Microsoft has helped in writing the code for send. And some of the major network equipment suppliers, such as Cisco and Juniper Network, have implemented the support for send. It is hoped that Microsoft will be able to implement the send support in all of its operating systems in the

,cisco,juniper and so on.C: Load Balancer Service, Amazon Elastic load balancer, etc.6: Shared sessions between multiple serversA:memcacheB: Shared directory files (NFS, etc.)C: Database7: Server DeploymentDomino Failure Effect: Assume a server farm consisting of two servers, based on the average load and concurrency, each server's load is probably60% of the capacity, the failure of one of the two servers causes another to attempt to handle a 120% loa

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the environment. 4. E-commerce Web site High-performance, highly available solutions, LVS load balancing (front-end four-tier load balancer). 5. The key point explanation of the construction process, the key step explanation. 6. This program has been used in practical production applications for many times, and can be flexibly applied. Second, the software load balance common several scenarios: 1.lvs+keepalived load Balancing, lvs+keepalived is a four-tier load balancing software under Lin

say their company does not have the necessary blockchain technical power. There are few companies with a dedicated team to ensure blockchain technology. As a result, these companies outsource the development of blockchain to professional agents and freelancers. Job Platform Upwork and LinkedIn (LinkedIn data show that the software technology industry, since 2014-2017, the issuance of Bitcoin-related posts increased by 4.6 times times) has shown that blockchain and Bitcoin-related capabilities a

December 2007 approved par (Project Authorization Request) to develop the next generation Network 40g/100g Ethernet standards. The next-generation standard IEEE 802.3BA will be introduced in June 2010, according to the plan. 40G and 100G at present, the future of the application is mainly concentrated in the data, when the server a wide range of 10gbase-t, the speed of core exchange must be followed by a significant increase. At the same time, the technology of FCOE,ISCSI in the data center mak

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Fault resolution: Implementing ECMP functions on the firewall I. Network Topology Ii. basic configuration 1. The Gateway in the workplace is the EX4200 of Juniper, Which is configured with vlan524: 10.63.224.0/24 and vlan525: 10.63.225.0/24. Configure the next hop of the default route to point to the firewall. 2. Two Internet leased lines (China Telecom and China Mobile) are connected on the firewall SSG550-1, and two default routes are configured wi

I. background The current network has a pair of Juniper mxbench routers that have just been put into use. They are only interconnected with the current network's one-to-one Huawei NE40E, and the interconnection link uses optical ports. Currently, mxbench needs to connect to a Huawei NE20 instance in a remote data center through a transmission network. The commissioning has not been successful. To verify that mxbench's optical port is normal, disable t

, Trunk can restrict the traffic to be transmitted only on the corresponding relay link by means of pruning. The impact of dozens of trunks on the core switch is far smaller than that configured with dozens of Route tables. Generally, the core switch can withstand dozens of trunks. You can limit the one-way speed of the port to make full use of the bandwidth in the other direction. This is especially useful for non-full-duplex ports. Q:Hello! After Configuring telnet on a cisco router, the defau

requirements of cloud computing. TRILL is equivalent to a layer-2 routing protocol. It has two-layer MAC bridging and three-layer IP routing functions. It applies the multi-path transmission mechanism to forward/route data traffic. The TRILL protocol is proposed to avoid the disadvantages of using IEEE 802.1D to quickly generate a Tree Protocol. The virtual chassis simplifies the data center network layers from Layer 3 to Layer 2, flattening the data center network and improving the efficiency