ip | 易学教程

GCP static public IP on VM NIC

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问题 I have a problem with a a particular licensed software that I have installed on a VM, and the software license should be tie to a public IP address on the NIC of the VM. The software checks the IP address of the server where the application is installed and verifies against the public license server of the application manufacturer, and if the IP address doesn't match, the software stops working. The software company has issue temporary license to my VM using private IP address, since I wasn't

Python Recognizing An IP In A String

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问题 I'm having a lot of trouble with this segment of code: command = "!ip" string = "!ip 127.0.0.1" if command in string: That's where I get stuck. After the first if statement I need another one to recognize any IP address just not 127.0.0.1. What's the easiest way of doing this? 回答1: I would give it a shot using regular expressions, where the regular expression (?:[0-9]{1,3}\.){3}[0-9]{1,3} is a simple match for an IP address. ip = '127.0.0.1' match = re.search(r'(?:[0-9]{1,3}\.){3}[0-9]{1,3}',

Ip host script bash

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问题 In the first if we want the hostname to appear, which is the 5th field from a file. Then if the IP we give to the host command does not exist, then the command returns message 3 (NXDOMAIN). The script should recognize if the command was "not found". In this case it will must simply print (-). #!/bin/bash ip="$1" if [ "$ip" ] ; then host "$ip" | cut -d' ' -f5 elif [[ "$ip" =~ "[3(NXDOMAIN)]$" ]] ; then echo "-" fi Do u have any solution on this exercise? 回答1: You're not testing the result of

How to use ipinfo.io in Node.js and Express (and Heroku) application properly

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问题 I want to block users from some specific countries, and found that ipinfo.io serves the purpose. But when I tried to use it in my Node.js and Express application, it looks like it didn't return a correct result. Here's the code that I wrote: var request = require("request"); exports.index = function(req, res) { request.get("http://ipinfo.io/" + req.ip + "/json", function(err, response, body) { res.write(body); res.end() }); } exports.index2 = function(req, res) { request.get("http://ipinfo.io

Disable IP address logging Rails

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问题 I am trying to disable logging of IP addresses while handling the request. But I am not able find a way to do this. I want to disable logging of IP for limited portion of my app where user is not yet authenticated. So my questions is How to disable logging of IP in rails log for specific pages(so the IP will not be saved in any log) I am using Rails 3.2.17 EDIT: Here is sample log (from environment.log) Started GET "/my_path" for 192.168.0.109 at 2014-03-28 11:53:20 +0530 I do not want to

技术往事：改变世界的TCP/IP协议（珍贵多图、手机慎点）

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1、前言作为应用层开发人员，接触最多的网络协议通常都是传输层的TCP（与之同处一层的另一个重要协议是UDP协议），但对于IP协议，对于应用程序员来说更多的印象还是IP地址这个东西，再往深一点也就很难说的清楚。本文将简要回故TCP/IP协议的过去、简单介绍TCP/IP协议族的关系，并与大家一起直观地分享由TCP/IP协议族所构建的虚拟网络与真实世界的“连接”情况。 2、TCP/IP协议简介互联网协议族（英语：Internet Protocol Suite，缩写为IPS），是一个网络通信模型，以及一整个网络传输协议家族，为互联网的基础通信架构。它常被通称为TCP/IP协议族（英语：TCP/IP Protocol Suite，或TCP/IP Protocols），简称TCP/IP协议。因为这个协议家族的两个核心协议，包括TCP（传输控制协议）和IP（网际协议），为这个家族中最早通过的标准。对于应用层开发人员，接触最多的网络协议通常都是传输层的TCP，为什么这么说，因为再往上的应用层协议，如：HTTP、HTTPS、POP3、SMTP、RPC、FTP、TELNET等等都是基于TCP传输层协议。但对于IP协议，对于应用程序员来说更多的印象还是IP地址这个东西，实际上IP协议是位于TCP协议之下的网络层，对于应用层程序员来说很难直接接触。下面这张图，直接的反映了TCP

Convert IP address in PostgreSQL to integer?

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问题 Is there a query that would be able to accomplish this? For example given an entry '216.55.82.34' ..I would want to split the string by the '.'s, and apply the equation: IP Number = 16777216*w + 65536*x + 256*y + z where IP Address = w.x.y.z Would this be possible from just a Query? 回答1: You can use split_part() . For example: CREATE FUNCTION ip2int(text) RETURNS bigint AS $$ SELECT split_part($1,'.',1)::bigint*16777216 + split_part($1,'.',2)::bigint*65536 + split_part($1,'.',3)::bigint*256 +

Can UDP packet be fragmented to several smaller ones [duplicate]

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问题 This question already has answers here : The most reliable and efficient udp packet size? (4 answers) Closed 8 months ago . Can UDP packet be fragmented to several smaller ones if it exceeds MTU? It seems that MTU fragmentation is about IP layer so I think it can. If so, what is the recommended max. packet size to send over UDP to avoid fragmentation and why? 回答1: Any IP datagram can be fragmented if it is larger than the MTU. Whether it contains UDP, TCP, ICMP, etc. does not matter. Most

Can UDP packet be fragmented to several smaller ones [duplicate]

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Send UDP packets to a node in another network

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来源： https://stackoverflow.com/questions/28895574/send-udp-packets-to-a-node-in-another-network