Ethereum ENS transfer
Ethereum Technology Development Co., Ltd. is a limited liability company (invested or controlled by a natural person) registered on December 28, 2017, with its registered address at 203 boshimingzhu property building, 199 Tianshan Street, high tech Zone, Shijiazhuang
the unified social credit code / registration number of Ethereum Technology Development Co., Ltd. is 91130108ma09lmk90h, and the legal person of the company is Li Gai. At present, the company is in business
The business scope of Ethereum Technology Development Co., Ltd. is: technology research and development, technology transfer, technology consultation and technical service of computer software and hardware, biotechnology, environmental protection technology and ecational software; Internet of things technology development, data processing services; Self operated or acting as an agent for import and export of various commodities and technologies (except those restricted or prohibited by the state); Electronic procts, environmental protection procts, medical devices, drugs, washing procts, sanitary procts, disinfection procts, daily necessities, cosmetics, needle textiles, household procts, maternal and infant procts, food, primary agricultural procts, kitchenware, sanitary ware, bags, clothing, toys, cultural procts, office supplies, audio-visual procts, books and newspapers Online and offline sales of electronic publications Projects that need to be approved according to law can be operated only after being approved by relevant departments)view more information of Ethereum Technology Development Co., Ltd. through aiqicha
I. the meaning of blockchain
in a narrow sense, blockchain is a kind of chained data structure composed of data blocks connected in sequence according to the time sequence, and it is a distributed account book that can not be tampered with and forged by means of cryptography
broadly speaking, blockchain technology is a new distributed infrastructure and computing paradigm, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data
ENS is Ethereum domain name service, a distributed, open and extensible domain name system based on Ethereum. Some hash addresses used in Ethereum ecosystem are usually very long, such as Ethereum wallet address and swarm file hash address, while ENS domain name system is designed to provide users with short and easy to read domain names. Ens does not grant any trademark or declare any ownership. The domain name application of ENS is a completely decentralized process. The domain name is not obtained through purchase. You need to deposit a certain amount of ether coin in the corresponding registration contract as a deposit for at least one year. In order to avoid garbage and meaningless operation, the process of auctioning domain names includes locking deposit and destroying penalty, trying to ensure that the domain name will be registered by the actual user. The ether money spent in the process will eventually be returned to the successful bidder and destroyed in breach of contract. It will not generate income and is completely non-profit.
description of ifcfg-eth0 configuration parameters in Linux:
ifcfg-eth0 is in / etc / sysconfig / network scripts,
its configuration is as follows:
device = physical device name
IPADDR = IP address
netmask = mask value
Network = network address
broadcast = broadcast address
gateway = gateway address
onboot = [yes | no]
userctl = [yes | no] (whether non root users can control the device)
bootproto = [none | static | BOOTP | DHCP] (boot) No protocol | static allocation | BOOTP protocol | DHCP protocol)
hwaddr = MAC address
some parameters are not required
the original configuration is as follows:
device = eth0
bootproto = DHCP
onboot = yes
in this case, the NIC is not activated
the modified configuration is as follows:
device = eth0
bootproto = static
broadcast = 192.168.129.128
IPADDR = 192.168.129.2
netmask = 255.255.255.0
Network = 192.168.129.0
onboot = yes
in this way, the network card can be activated every time it is turned on.
In the new version of CentOS 7, there is another set of rules for the number of network card. The code number of network card is related to the source of network card
1, eno1: represents the network card built in the main board BIOS
2, ens1: represents the PCI-E network card built in the main board BIOS
3, enp2s0: PCI-E independent network card
4, eth0: if none of the above is used, Then return to the default network card name
ens32, which belongs to the second type, that is to say, the network card is a built-in PCI-E network card
extended data:
PCI network card can not only realize the physical connection and electrical signal matching with LAN transmission medium, but also involve the functions of frame sending and receiving, frame encapsulation and unpacking, medium access control, data encoding and decoding, data caching, etc
PCI-E adopts the point-to-point serial connection which is popular in the instry at present. Compared with PCI and the earlier shared parallel architecture of computer bus, each device has its own special connection. It does not need to request bandwidth from the whole bus, and it can increase the data transmission rate to a very high frequency, reaching the high bandwidth that PCI cannot provide Compared with the traditional PCI bus, which can only realize one-way transmission in a single time cycle, the al simplex connection of PCI-E can provide higher transmission rate and quality, and the difference between them is similar to that between half plex and full plexiptables - t NAT - a routing - I eth0 - s 192.16.0.0/24 - J drop
all translations from eth0, the IP address segment of the network card 192.16.0.0/24, are discarded
The solution is as follows:
1. Log in to the Linux system through the user name and password, and modify the IP only under the root user