ip

问题 How can I resolve a host IP address, given a URL in Visual C++? 回答1: To use the socket functions under Windows, you have to start by calling WSAStartup , specifying the version of Winsock you want (for your purposes, 1.1 will work fine). Then you can call gethostbyname to get the address of the host. When you're done, you're supposed to call WSACleanup. Putting that all together, you get something like this: #include <windows.h> #include <winsock.h> #include <iostream> #include <iterator>

问题 Why do we need to specify a port number with an IP address even if we are using HTTP protocol? For example - http://xyz:8080... - what does this even mean? We already know that while using HTTP the request will be served at port 80, so why do we specify a port explicitly? Please bear with me with this stupid question. 回答1: The default port for HTTP is 80 and HTTPS is 443 but port numbers range from 0 to 65535. Most web servers listen on the default port so it's simpler to refer to the URL

问题 I understand that when sending ip messages around, each hop in the network path between be and my packet's destination will check if the next hop's MTU is bigger than the size of the packet I sent. If so, the packet will be fragmented and the two packets will be separately sent to the next hop, only to be reassembled at destination (or, in some cases, at the first NAT router encountered). As far as I understand, this thing can be pretty bad, but I don't really understand why. I understand

问题 I understand that when sending ip messages around, each hop in the network path between be and my packet's destination will check if the next hop's MTU is bigger than the size of the packet I sent. If so, the packet will be fragmented and the two packets will be separately sent to the next hop, only to be reassembled at destination (or, in some cases, at the first NAT router encountered). As far as I understand, this thing can be pretty bad, but I don't really understand why. I understand

问题 How can i go about programaticaly getting the IP address of my network as seen from the Internet? Its obviously a property that my router has access to when it connects to the ISP. Is there any way to get this info from a router using a standard protocol. My only other option is to either find a WS which returns my IP address (suprisingly difficult to do), or just go to something like whatismyip.com and strip out all the HTML (very dirty and susceptable to change). Is there any other way???

问题 How can i go about programaticaly getting the IP address of my network as seen from the Internet? Its obviously a property that my router has access to when it connects to the ISP. Is there any way to get this info from a router using a standard protocol. My only other option is to either find a WS which returns my IP address (suprisingly difficult to do), or just go to something like whatismyip.com and strip out all the HTML (very dirty and susceptable to change). Is there any other way???

问题 I have an IP like this: 12.12.12.12 I'm looping through different IP ranges (in 12.12.12.0/24 (example)) format, and trying to see if the IP is in the range. I have tried various methods such as inet_addr and comparing but I can't seem to get it. Is there an easy way to do this? I'm using Windows. 回答1: Just test whether: (ip & netmask) == (range & netmask) You can determine the netmask from the CIDR parameters range/netbits as follows: uint32_t netmask = ~(~uint32_t(0) >> netbits); 回答2: Take

问题 This question already has answers here : How can I access my localhost from my Android device? (36 answers) Closed 5 years ago . I am new at android. I am devloping an app that uses MySQL. The application runs well in the emulator. But now I need to run the app in a android device. What can I do. 回答1: As stated in the first comment, you should check your file AndroidManifest.xml. In order to access the network, it should contain the following instructions : <uses-permission android:name=

问题 How to get gateway IP details , There is option using wifimanager but. If there is no wify how to find gateway,dns and other details in android device when connected using usb tethering. 回答1: I'm using cyanogenmod 7.2 on android 2.3.4, then just open terminal emulator and type: $ ip addr show $ ip route show 回答2: I wanted to post this answer as an update for users of more recent Android builds (CM11/KitKat/4.4.4). I have not tested any of this with TouchWiz or older Android releases so YMMV.

问题 How to get gateway IP details , There is option using wifimanager but. If there is no wify how to find gateway,dns and other details in android device when connected using usb tethering. 回答1: I'm using cyanogenmod 7.2 on android 2.3.4, then just open terminal emulator and type: $ ip addr show $ ip route show 回答2: I wanted to post this answer as an update for users of more recent Android builds (CM11/KitKat/4.4.4). I have not tested any of this with TouchWiz or older Android releases so YMMV.