ip

问题 If I have a subnet mask e.g. 255.255.255.0 and an ip address 192.168.1.5 , is there an easy way to determine all the possible ip addresses within this subnet? In this case: 192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.4 ... ... 192.168.1.252 192.168.1.253 192.168.1.254 192.168.1.255 All I found until now are heavy overloaded .net libraries. Isn't there any native way to solve this with the default namespaces? 回答1: To determine the adress range follow these steps : 1) Take your subnet mask

问题 I am writing unit tests for a client library. I want to test connecting with an invalid port and an invalid ip. What is a good ip address to use that won't potentially be routed somewhere? I don't want to make any assumptions about the network the machine running the unit tests is on. LOCALHOST seems like a bad choice since that is the valid machine running the server component and I want to test an invalid port separately. Is there an INVALID-IP reserved somewhere in the IPv4 spec? 回答1:

问题 I am writing unit tests for a client library. I want to test connecting with an invalid port and an invalid ip. What is a good ip address to use that won't potentially be routed somewhere? I don't want to make any assumptions about the network the machine running the unit tests is on. LOCALHOST seems like a bad choice since that is the valid machine running the server component and I want to test an invalid port separately. Is there an INVALID-IP reserved somewhere in the IPv4 spec? 回答1:

问题 If I have two internal computers connecting to the same external IP address through a NAT router, how is the router able to get the traffic to the correct internal computer? It is my understanding that NAT forwards incoming packets to the computer that recently sent outgoing packets to the [incoming packet's] sender's IP address. Since both computers are sending to the same address, does the router forward the packet to both? If that is the case, is it the responsibility of the client

问题 the server throws this error "Attempting to deserialize an empty stream" at server side in this line when I run the server: this.tcpListener.Start(); This is my internet IP, if I use my local IP, it works. But i want the internet IP. Client side: TcpClient tcpclnt = new TcpClient(); Console.WriteLine("Connecting....."); tcpclnt.Connect("187.115.131.44", 8001); Server side: public Server() { try { IPAddress ip = IPAddress.Parse("187.115.131.44"); tcpListener = new TcpListener(ip, 8001);

问题 how do one determine location based on ip? I'm not asking for any product or service, but rather how to go about implementing it technically. The ip to country is a rather static mapping. What about more specific locations? 回答1: geobyte is a good service to locate ip address. If you are thinking about an algorithm to find location based on IP, I think there is none. It is basically a database look up and you will retrieve the location based on the IP address. 来源： https://stackoverflow.com

问题 We have a directory on our site which we only want to be accessible by a couple of IP addresses. So we have this .htaccess file to try and get it working: RewriteEngine on RewriteCond %(REMOTE_ADDR) !^123\.123\.123\.123 RewriteCond %(REMOTE_ADDR) !^124\.124\.124\.124 RewriteCond %{REMOTE_ADDR} !^125\.125\.125\.125 RewriteCond %{REMOTE_ADDR} !^126\.126\.126\.126 RewriteCond %{REMOTE_ADDR} !^127\.127\.127\.127 RewriteCond %{REMOTE_ADDR} !^128\.128\.128\.128 RewriteCond %{HTTP_REFERER} !^http:/

问题 I want to calculate the broadcast address for: IP: 192.168.3.1 Subnet: 255.255.255.0 = 192.168.3.255 in C. I know the way (doing fancy bitwise OR's between the inversed IP and subnet), but my problem is I come from the green fields of MacOSX Cocoa programing. I looked into the source of ipcal, but wasn't able to integrate it into my code base. There must be a simple ten lines of code somewhere on the internet, I just can't find it. Could someone point me to a short code example of how to do

问题 I have this C struct: (representing an IP datagram) struct ip_dgram { unsigned int ver : 4; unsigned int hlen : 4; unsigned int stype : 8; unsigned int tlen : 16; unsigned int fid : 16; unsigned int flags : 3; unsigned int foff : 13; unsigned int ttl : 8; unsigned int pcol : 8; unsigned int chksm : 16; unsigned int src : 32; unsigned int des : 32; unsigned char opt[40]; }; I'm assigning values to it, and then printing its memory layout in 16-bit words like this: //prints 16 bits at a time

问题 I'm setting up Solr using Jetty. I would like to restrict access to only a few IP addresses. It doesn't seem immediately obvious that this can be done using Jetty. Is it possible and if so, how? 回答1: Solr 4.2.1 uses Jetty 8.1.8. Jetty 8 (as noted by jonas789) doesn't support .htaccess. Instead, it uses IPAccessHandler, which doesn't have great documentation available. I had to play with it quite a bit to get it work, so I'm posting an updated solution here. IPAccessHandler manages a blacklist