The public IP address sends UDP packets to a PC that is powered down on the internal network

If your gateway has a fixed IP address, it may not be malicious, but caused by a virus or something else.

If you are a dynamic IP, then it means that not only is it malicious, but also that you have a computer in your local area network"Espionage"

It is generally known that if he has been sending the contract to the intranet 146, it is very easy to do.

The gateway blocks all UDP packets destined for computer 146.

I don't know what your gateway is, so I can't provide a specific shielding solution.

In the case of routing, I set it directly in IP security.

If you want to use the server, you can set it by IP security policy. Above.

There are a lot of viruses on the network, it is not necessarily someone attacking you, you had better open the firewall on the gateway or router.

Wants to attack you. Turn on the firewall and anti-virus software monitoring

Attack you.

Hurry up and defend The best way to do this is to unplug the network cable.

If there is no Internet connection, the computer wants to go to the Internet, and sends UDP as a DHCP request packet, and keeps sending it until it gets the address.

Poisoned! Let's go to the virus first! Or ask the user of that machine if they're uploading something? Or are you using BT?

When the LAN host of the public IP address sends packets to the outside world, there will be a port host record, and at the public network gateway or router, this port will be recorded, and when the communication between the public network host and the host is received, the port host record will be compared according to the port number and sent to a specific host.

Specifically, you can search for NAT technology.

The external network cannot directly access the internal network. It must be the internal network that sends the request first, and the external network knows how to return the request. Otherwise, the Internet can only know your Internet IP at most.

You don't need to get the MAC address of the internal machine. Because all internal data is the router's**. And there is a LAN IP address inside.

The distinction is based on port mapping. For details, please refer to "How to communicate between intranet and extranet".

The problem is that what the router can see on the external network is that the ALAN IP, you send the data to, and the external network IP has the router ** to the VLAN port.

I heard that Peanut Shell's dynamic domain name resolution service can achieve this function.

Sidestep the question! For example, my address has been converted by NAT), and now I want to send it to a friend, his external address is, and his internal address is, how to send it? If you fill in the destination address, it is obviously wrong, and it is even more nonsense to fill in the intranet address, how to solve this situation?

Installing a Skynet firewall is very effective and can block almost all UDP packets

It is recommended to reinstall another computer system!!

Disconnect the Internet and then kill the virus!

If the pants are switched, it is likely to be poisoned. Normally, you're all hit! It is recommended to unplug the network cable first, and try to connect the network in turn after the antivirus is disinfected!

It must be poisoned, let's kill it.