How does Ethereum client discover neighbors

1. Where are you going? Wallet or exchange
transfer eth, as long as there is an address, you can transfer it out
mnemonic words are things that you can help to find when you forget your key, not related to money collection.

2. In general, the device of H3C starts the NTP protocol
if it is not turned on,
use NDP enable to turn it on,
use dis NDP to view neighbor devices

3. NDP protocol has two main purposes:
one is used for stateless automatic configuration (IPv6 address automatic configuration)
two is used to request MAC address of other hosts
first of all, about the first purpose:
1: after the device is connected to the network, it will send a request message (RS message) to directly connect to the router to request IPv6 address
2: after the router receives the RS message, it will send a request message (RS message) to directly connect to the router to request IPv6 address, A notification message (RA message) will be sent, which contains the IPv6 address requested by the device.
for the second purpose:
1: when host a communicates in the LAN, it also needs MAC address. When host a needs to communicate with another host B, It will send neighbor request message (NS message) to the requested source multicast address corresponding to host B (the requested source multicast address is only associated with one IPv6 address)
2: after receiving ns message, host B will encapsulate its MAC address in neighbor notification message (Na message) and send it to host a

PS: NDP has the following functions: redirection, IP address, IP address, etc Address conflict detection, neighbor unreachable, parameter discovery, next hop discovery, etc

4. The solution of Windows operating system LAN can't visit each other

the computer installed with Windows XP in LAN can't visit each other with the computer installed with Windows 98, and the computer installed with Windows XP can't communicate with the computer installed with Windows XP. When the workstation accesses the server, the name of the server can be seen in the "network neighborhood" of the workstation, but after clicking it, it can't see any shared content, or it prompts that the network path can't be found, and it has no right to access, etc., which can be summarized as follows:
when XP is first used, it is necessary to create a new network connection in the properties of the network neighborhood for the network installation wizard

1. Check the physical connection between computers

network card is the basic equipment of network connection. In desktop computer, the indicator light behind each network card should be on, which means that the connection is normal. If it is not on, please check that the hub or switch is on, and the indicator light of each client connection is on, which means that the link is normal. Next, check whether the crystal head of the cable is in good contact

2. Ensure that TCP / IP is installed on all computers and works normally

TCP / IP is installed by default in Windows XP. However, if there is a network problem, it is not easy to re install TCP / IP after uninstalling: click the Internet Protocol (TCP / IP) item in the following list of items displayed in the local connection property, and you will find that the uninstall button is not available (disabled)

this is because the TCP / IP stack is the core component of Microsoft XP / 2003 and cannot be deleted. In this case, if you need to re install TCP / IP to restore the TCP / IP stack to its original state. You can use the Netshell utility to reset the TCP / IP stack to the state it was when the operating system was first installed. The method is: at the command prompt, type the following command, and then press enter: Netsh int IP reset C: &# 92; Resetlog.txt, where resetlog.txt is the log file to record the result of the command. It must be specified. Here, the resetlog.txt log file and the full path are specified. The result of running this command is the same as removing and re installing the TCP / IP protocol

3. Use ping command to test the connection between two computers in the network:

Ping other computer IP, at the command prompt, type Ping x.x.x (where x.x.x is the IP address of the other computer), and then press enter. You should see several replies from another computer, such as:

reply from x.x.x.x: bytes = 32 time & lt; 1ms TTL = 128

if you don't see these responses, or if you see & quot; Request timed out"， Indicates that there may be a problem with the local computer. If the ping command is executed successfully, you are sure that the computer is properly connected and you can skip the next step. If you don't see the answers, or if you see & quot; Request timed out"， Indicates that there may be a problem with the local computer. Ping local IP, if you see & quot; Request timed out"， Indicates that there may be a problem with the local computer

4. Use ping command to test whether the name resolution in the network is normal

Ping computername, where computername is the name of the remote computer. Use the ping command to test the computer connection by name. To determine the name of the computer, enter systeminfo at the command prompt. Or on the desktop, right-click My Computer - properties, and then click the computer name tab. If you see a successful reply to the command, you have a basic connection and name resolution between computers. Name resolution is closely related to NetBIOS. See the following steps

5. Correctly install the network components

first, right-click the network neighborhood - properties and select the network card to share. Set IP on the same segment of LAN. For example, 192.168.1. X network segment. Then look at the advanced properties of TCP / IP, whether to turn on NetBIOS

in the network system built with winnt4.0, the unique identification information for each host is its NetBIOS name. The system resolves the NetBIOS name to the corresponding IP address by using various modes such as wins service, information broadcast mode and lmhost file, so as to realize information communication

in the internal network system (i.e. LAN), it is very convenient and fast to use NetBIOS name to realize information communication. But on the Internet, the only identification information for a host is its FQDN domain name (163. Com). On the Internet, DNS standard is used to resolve the domain name to the corresponding IP address. Win2K supports dynamic DNS, and the machine running active directory service can dynamically update the DNS table< However, Win2K still supports wins because of backward compatibility. At present, most networks are hybrid networks, including Win98 and WinXP / Win2K systems. Therefore, it is necessary to bind NetBIOS to TCP / IP protocol to resolve the computer name

check whether the file and print service component is selected. If it is deselected, the browse service will not be bound to the NetBIOS interface. Windows based computers that are backup browsers and do not have file and print sharing enabled cannot share browse lists with clients. Any computer that will be included in the browse list must also have file and print sharing enabled

6. Enable printing and file sharing

you can see whether the printer and file sharing are installed in the network neighborhood and local connection properties. Verification: if you can't see your own machine in the network neighborhood, you don't have printer and file sharing installed

7. Start & quot; Computer browser & quot; Services

computer browser & quot; The service maintains a list of computer updates on the network and provides this list to computers designated as browsers. If the service is stopped, the list is neither updated nor maintained

Win2K / XP should ensure that the computer browsing service starts normally. Open computer management - & gt; Services and applications - & gt; In the right window, make sure that the "computer browser" is not stopped or disabled

8. Run the network identification wizard

my computer, select "properties", then click the "computer name" tab, click the "network ID" button to start the "network identification Wizard": click "next", and select "this computer is a part of the commercial network, use it to connect to other working computers"; Click Next and select company uses network without domain; Click next, then enter the name of your LAN's workgroup, click next again, and finally click Finish to complete the setup<

9. Win2K installs NetBEUI protocol

in Win2K, NetBEUI protocol is an efficient protocol, which can be used in LAN, so it must be installed:

Network Neighborhood - & gt; Attribute - & gt; Local connection - & gt; Attributes --- & gt; Installation ----- & gt; Agreement; NetBEUI protocol

10. Use the guest account

Windows XP's guest account allows other people to use your computer, but does not allow them to access specific files or install software. All network access to a Windows XP Home Edition computer or a Windows XP Professional Computer in a workgroup uses a guest account. Use net user guest to ensure that the guest account is set for network access. If the account is active, a line similar to the following will appear in the command output: account active yes; If the account is not active, use the following command to grant network access to the guest account:

net user guest/ active:yes

or open the control panel - & gt; User accounts or in management tools - & gt; Computer management - & gt; Open the guest account in local users and groups

11. Allow the guest account to access the computer from the network

enter gpedit.msc in the runtime to pop up the group policy manager. In "computer configuration - Windows settings - local policy - user rights assignment", there is a "deny access to this computer from the network" policy to prevent access to this computer from the network, If there is a guest account in it, the solution is to delete the guest account in the denied access

12. Firewall

make sure that the firewall of WinXP is not turned on. Open the local connection property - & gt; Advanced, turn off the Internet connection firewall. If a third-party firewall proct is used, refer to its user manual to ensure that the firewall does not prohibit the communication of the following ports: udp-137, udp-138, tcp-139, tcp-445 (only Win2K and later operating systems)<

the latest SP2 patch of Windows XP has greatly improved ICF and made it more powerful. ICF has its own setting items. After installing SP2, ICF firewall is enabled by default and no external active connection is allowed. Even if local applications want to access the network, they need to set in the permission list

but the firewall blocks the normal network browsing service communication. As a result, other people can't see your computer in the network neighborhood. Is there a way to have the best of both worlds to allow browsing service on the premise of opening the firewall

If ICF is enabled, open properties, and select add in the service column. There are four edit boxes in the add service dialog box. The top one describes the service name for easy memory. The second one is the IP address or name of the application service from top to bottom. Enter 127.0.0.1 to indicate the local machine

the following is the internal and external port number, and the TCP / UDP next to it indicates whether the port is a UDP connection or a TCP connection

enter three services according to the table below

name protocol port

NetBIOS name service UDP 137

NetBIOS datagram service UDP 138

NetBIOS session service TCP 139

137 / UDP -- NetBIOS name server, Network basic input / output system (NetBIOS) name server (NBNS) protocol is a part of the NetBIOS (NetBt) protocol family over TCP / IP. It provides host name and address mapping methods on the network based on NetBIOS name access

138 / UDP -- NetBIOS datagram, which is a part of the NetBIOS (NetBt) protocol family over TCP / IP, is used for network login and browsing

139 / TCP -- NetBIOS session service, a part of the NetBIOS (NetBt) protocol family over TCP / IP, is used for server message block (SMB), file sharing and printing

13. Check that RPC and plug and play services have been started, check the permissions of the corresponding system folder, and re register the following DLL

Regsvr32 Netshell. DLL

Regsvr32 netcfgx. DLL

Regsvr32 NetMan. DLL

14. Set account and password

e to the operating system of WinNT kernel, When accessing the remote computer, it seems that you always try to use the local current user name and password first, which may result in inaccessibility. Just add the user password here

15. Multiple ways to access "network computer"

for example, to open a computer named "killer" in the network, its IP address is 192.168.1.8, if you don't know

5. To find the settings of the other computer in the network neighborhood, the specific operations are as follows:
1. Enable the guest account
2. In control panel → management tools → local security policy → local policy → user right assignment, add the guest account in "access this computer from the network", and delete the guest account in "refuse to access this computer from the network"
3. My computer → tools → folder options → view → remove the check before "use simple file sharing (recommended)"
4. Set the shared folder
5. In control panel → management tools → local security policy → local policy → security options, set "network access: sharing and security mode of local account" to "only guest local user authenticates as guest" (optional, this setting can remove the dialog box requiring password input ring access, It can also be set as "classic - local users authenticate with their own identity") according to the situation
6. Right click "my computer" → "properties" → "computer name" to see if your LAN workgroup name, such as "work", appears in this tab. Then click the "network ID" button to start the "network identification Wizard": click "next" and select "this computer is a part of the commercial network, use it to connect to other working computers"; Click Next and select company uses network without domain; Click the "next" button, then enter the name of your LAN's workgroup, such as "work", click the "next" button again, and finally click the "finish" button to complete the setup

after the above steps, it can be basically solved. If not, look down:
7. Check whether the local connection is disabled. Right click local connection → enable
8. Turn off the network firewall
9. Check whether the domain is enabled and joined, and check the domain settings
10. Check whether the server service has been shut down
11. Check the local connection IP, subnet mask, gateway and DNS settings for errors
12. Check whether Microsoft network file and printer sharing, Microsoft network client and TCP / IP protocol are installed
13. Some LAN games and software need to install NetBEUI protocol. Moreover, an article on the Internet says that in small LANs, Microsoft only supports TCP / IP protocol and nwlink IPX / SPX / NetBIOS compatible protocol in WinXP, and the performance is not satisfactory. In small LANs (networks with about 200 computers), NetBEUI is the protocol with the least memory and the fastest speed
installation method:
① put the Windows XP installation CD into the directory of "valueaddmsft et etbeui" and netnbf.inf to C: &# 92; Windows\ Inf
② nbf.sys to C: &# 92; Windows\ System32\ In drivers
③ start → control panel → network neighborhood → network connection → local connection (which is the LAN connection you are currently using), right-click → "properties" → "general" → "installation" → "communication protocol" → "add". At this time, you can see the "NetBEUI Protocol" (this item was not originally available). After selecting NetBEUI, you can, Press OK
14. Because of virus, low configuration, slow running and crash, the list of computers on the network can not be updated, so that some computers can not be found in the network neighbors
solution: the simplest way is to restart all kinds of network devices and computers, or turn off the web browsing server function of indivial computers with the above problems
15. Patch the system. Winxp has a slow speed in accessing the network neighborhood. This is a bug of WinXP. When we open the network neighborhood, the operating system will first search from the scheled task, which greatly affects the speed of access. Unless you have installed the Sp1 patch, this problem will not exist
this problem can be solved manually. Find "&" 92 from the registry; HKEY_ LOCAL_ MACHINE\< br />SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Explorer\ RemoteComputer\ There is a subkey named "{d6277990-4c6a-11cf-8d87-00aa0060f5bf}". The subkey points to "scheled tasks", and you can delete it directly

16. Unload the NIC driver first, restart and then reload

17. Hardware problems. Check the network card, network cable, hub, router, etc. before checking, it is better to restart the network equipment (hub, switch, router) to see if it can be solved< 18. Virus (Trojan horse) reasons. Upgrade the virus library and kill all viruses in the safe mode.

6. To turn off the firewall, two computers should be in the same network segment. Turn on file sharing
if it is still not available after setting, it is recommended to download a "LAN share one click repair" small software and run it.

7. If they are masters, they won't let you touch other people's networks.
you use those networks that don't know much about computers.

even if you hide the network neighbor client, what can you do
you can also see that you are using someone else's network in the router's connecting device.
so, when someone else doesn't find it, you can always use it.
basically you can't find it

8. Huawei uses lldp protocol, and the default device is not on
lldp enable enables lldp
Display lldp Nei br view lldp neighbor information

9. Open my computer, in the lower left corner of the place there is a network of scalable menu, similar to the tree directory, even for a long time...

10.

Hello friends! If you find that your neighbor is with the people who follow you and beat you secretly every day, then it is likely that the people arranged by your neighbor follow you and beat you. There is no evidence to prove that your neighbor did not matter. At least some people beat you really. Call the police and arrest these people. You tell the police the situation. The police will have a way to let the bad guys who beat you tell the truth ring interrogation, If it's really your neighbor's fault, the police will catch him

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