nat

问题 I want to connect to a system which is behind a router. I know the public address of the router as well as the private ip (fixed always) of the system. How do i establish socket connection with the private ip? 回答1: This is why some people say that they are behind a "firewall", when they are behind a router. The Evil Viruses Of The Internet are not able to exploit any software on a computer behind a router (provided that the router admin didn't configure it in the funny way, for example by

问题 Even when I create EC2 instances in a private subnet, they must be able to send traffic to the Internet if I want to register them to a ECS cluster. I am using a NAT gateway to do this, but I still feel insecure that the instances can send private information to anywhere in case of takeover. What would be the most compact CIDR range that I can use for the instances' security group, instead of 0.0.0.0/0? 回答1: For the moment, you may have to rely on the list of public IP address ranges for AWS,

问题 I a trying to setup this machine: https://github.com/ByteInternet/hypernode-vagrant When I do vagrant up i get following error: Timed out while waiting for the machine to boot. Full context of the error: $ vagrant up Bringing machine 'hypernode' up with 'virtualbox' provider... ==> hypernode: Will use PHP 7. If you want PHP 5.5 instead change the php version in local.yml. ==> hypernode: Checking if box 'hypernode_php7' is up to date... ==> hypernode: Clearing any previously set forwarded

问题 I try to send a message from one phone to another using Kryonet (that uses socket communication) and I intend to use NAT punch-through by storing the public address of the clients. The following code is used: public class MainActivity extends Activity implements View.OnClickListener { /** * Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = ((Button)

问题 My Spring application is running on a machine that is behind a NAT firewall (pfSense). The machine's internal IP is a.b.c.d , and the NAT IP is w.x.y.z The Spring configuration's serviceUrl is set to my internal IP ( a.b.c.d ) on port 1100 , and when I start the application, I provide the following switches: -Dcom.sun.management.jmxremote -Djava.rmi.server.hostname=w.x.y.z -Dcom.sun.management.jmxremote.port=1099 -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote

问题 I'm trying to make a peer to peer app in php to work in the same kind of way skype works. It works with internal addresses, but when I try to send data to my external address the message never gets there. Obviously I'm missing some address translation, but I'm at a loss for how to do that with PHP sockets. Is it possible? This is the code i have at the moment to receive the message, which I run first to wait for some message: <?php $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP) or die(

问题 I need a solution for NAT traversal to transmit RDP data across the internet. I came across the following tool and it's really amazing - pwnat. I have tried it with the two different machines behind different router, but i am unable to make it work as explained in the above link. So is pwnat still working and if yes what could I have done wrong? It would be very helpful for me. Note: I am using a Windows machine for testing and downloaded the Windows version from the following link: http:/

问题 I'm trying to etablish a connexion between two computers behind NAT. I can't open any port. I would like to use a broker who will be on the internet and who will be able to comunicate with the 2 others. After, i would like to etablish a tunnel between those 2. I'm using Python and i'm trying to code this broker. How can i begin this ? 回答1: What you want to do is possible, and almost routine (at least for UDP). It's called NAT hole punching. It won't work with every NAT in the world, but it

问题 I am working on Holepunching using UDP and UDT. For the final testing I need to test the application on different NAT types (Symmetric,full cone,restricted cone, port restricted NATs). Is there any method I can simulate these? What I expect here is some kind of virtual-Box setup. Can I use PC as a router so that I can configure according to my needs? In general how do we test applications for different network conditions? 回答1: I think you already answered your own question, use VirtualBox (or

问题 There is an answer explaining in simple terms how a router works translating requests from the local network to outside and back (https://superuser.com/questions/105838/how-does-router-know-where-to-forward-packet) what is not clear - for how long a record in the NAT is kept? For example, if I send a UDP request to 25.34.11.56:3874 and my local endpoint is 192.168.1.21:54389 the router rewrites the request packet and adds a record to the NAT. Let's say the external endpoint will be 68.55.32