ipv6

How can I convert IPV6 address to IPV4 address?

隐身守侯 提交于 2019-12-17 06:55:01
问题 I have application that uses IPv4 addresses (it stores them as long), so it only understands IPv4 addresses. Is it possible to convert IPv6 address to IPv4 with Java ? 回答1: While there are IPv6 equivalents for the IPv4 address range, you can't convert all IPv6 addresses to IPv4 - there are more IPv6 addresses than there are IPv4 addresses. The only sane way around this issue is to update your application to be able to understand and store IPv6 addresses. 回答2: The IPAddress Java library can

Maximum length of the textual representation of an IPv6 address?

南笙酒味 提交于 2019-12-17 02:52:45
问题 I want to store the data returned by $_SERVER["REMOTE_ADDR"] in PHP into a DB field, pretty simple task, really. The problem is that I can't find any proper information about the maximum length of the textual representation of an IPv6 address, which is what a webserver provides through $_SERVER["REMOTE_ADDR"] . I'm not interested in converting the textual representation into the 128 bits the address is usually encoded in, I just want to know how many characters maximum are needed to store any

Ubuntu启用IPv6上google的方法

我怕爱的太早我们不能终老 提交于 2019-12-16 21:58:31
IPv6就是我们通常所说的互联网协议,是TCP/IP的核心协议,那么在Linux下如何开启IPv6呢?下面以Ubuntu为例,给大家介绍下Ubuntu启用IPv6的方法。 方法:   $sudo apt-get install miredo   $ifconfig   在结果中应该能看见一个叫 teredo 的虚拟网卡。   $ ping6 ipv6.google.com   PING ipv6.google.com(2404:6800:8003::93) 56 data bytes   64 bytes from 2404:6800:8003::93: icmp_seq=2 ttl=57 time=910 ms.。。。。。。。。。。。。。。。。。。。。。。   现在您的浏览器应该可以访问 https://ipv6.google.com 了。   $sudo gedit /etc/hosts   把host列表拷贝进去,hosts列表发布地址:https://serve.netsh.org/pub/ipv6-hosts/   现在应该可以正常访问: http://www.youtube.com/   修改下防火墙设置:( 这一步一般不用)   $sudo gedit /etc/default/ufw   把IPV6=no 改成 yes   最后禁用/启用防火墙来使刚刚的改动生效:

IPv6 手工tunnel和自动tunnel

谁都会走 提交于 2019-12-16 19:08:25
IPv6 手工tunnel和自动tunnel 12.2.1 IPv4向IPv6过渡理论基础 隧道技术在CCIE考试中经常涉及,所以在BGP这个章节我们增加了相关的隧道技术 双栈(ipv4和ipv6同时运行)是ipv6 tunnel的前提,所以双栈技术也是一种过渡技术。IPv6手动tunnel和自动tunnel是IPv4向IPv6过渡的重要工具  手动tunnel把ipv6封装到IPv4包内,支持任意的路由协议  自动tunnel(6to4 tunnel)通过计算把IPv6地址内嵌到IPv6地址,不支持动态路由协议,支持静态路由 12.2.2 实验拓扑描述 13. 如图11-14所示,R2和R3各自有直连地址23.1.1.x/24和环回口22.1.1.1,33.1.1.1,IPv6的直连地址为20XY::X/64比如R1的e0/1=2012::1/64,环回口为20XX::X/128,如2011::1/128 图12-2 向IPv6过渡的隧道技术 12.2.3 IPv6隧道技术实现 1、启用双栈(既运行IPv4也运行IPv6),并在R2和R3之间运行任意的IPv4路由协议 我们选择eigrp,使得两者的环回口相互可达,参考命令: R2R2#ping 33.1.1.1 source 22.1.1.1 Type escape sequence to abort. Sending 5,

linux系统关闭IPv6

风流意气都作罢 提交于 2019-12-16 18:06:36
linux系统关闭IPv6的方式 IPv6被认为是IPv4的替代产品,它用来解决现有IPv4地址空间即将耗尽的问题 。但目前,开启IPv6可能会导致一些问题。因此有时我们需要关闭IPv6。下面是IPv6的关闭方法 应该适用于所有主流的Linux发行版包括Ubuntu、Debian、 CentOS。 方法1: 编辑文件/etc/sysctl.conf vi /etc/sysctl.conf 添加下面的行: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 如果你想要为特定的网卡禁止IPv6,比如,对于enp0s3,添加下面的行。 net.ipv6.conf.enp0s3.disable_ipv6 = 1 保存并退出文件。 执行下面的命令来使设置生效。 sysctl -p 方法 2: 要在运行的系统中禁止IPv6,依次输入下面的命令: echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6 echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6 或, sysctl -w net.ipv6.conf.all.disable_ipv6=1 sysctl -w net.ipv6.conf

Java 检查IPv6地址的合法性

旧街凉风 提交于 2019-12-16 00:56:34
由于IPv4资源即将耗尽,IPv6将要正式启用,这是大势所趋。 一些现有的服务和应用逐步要对IPv6支持,目前还处在过渡阶段。 提前了解一些IPv6的知识,还是有必要的。 如何判断一个IP地址,是否为IPv6地址呢? 以下代码是用Java实现的,用于校验IPv6地址合法性。 代码如下: import java.text.Normalizer; import java.text.Normalizer.Form; import java.util.regex.Matcher; import java.util.regex.Pattern; public class IPV6Check { public static void main(String[] args) { String ipv6_1 = "2019:db8:a583:64:c68c:d6df:600c:ee9a"; String ipv6_2 = "2019:db8:a583::9e42:be55:53a7"; String ipv6_3 = "2019:db8:a583:::9e42:be55:53a7"; String ipv6_4 = "1:2:3:4:5::192.168.254.254"; String ipv6_5 = "ABCD:910A:2222:5498:8475:1111:3900:2020";

Javascript calculate IPv6 range from CIDR prefix

你。 提交于 2019-12-14 03:59:09
问题 Using Javascript (without JQuery) I'm looking to get the minimum and maximum IPs in a IPv6 CIDR prefix. For example, 2001:280::/32 would output 2001:280:0:0:0:0:0:0 and 2001:280:ffff:ffff:ffff:ffff:ffff:ffff . How can I do this? Thanks in advance! 回答1: Assuming you have Node and NPM installed: $ touch index.js $ npm init $ npm i --save ip-address $ vim index.js var v6 = require('ip-address').v6; var addr = new v6.Address('2001:280::/32'); console.log(addr.parsedAddress.join(':')); console.log

access ipv6 website over ipv4 network

狂风中的少年 提交于 2019-12-14 03:26:00
问题 If the servers of a website internally use the IPv6 protocol, how can a regular IPv4 computer access the website? I'm curious about which protocols etc. are in place to make this happen? 回答1: You need in-the-middle boxes that support both IPv4 and IPv6 and some way to translate or proxy. End-to-end communication between different protocols is not possible. For example, if a web server is IPv6-only then an external reverse (layer 7) proxy with IPv4 and IPv6 could accept requests over IPv4 and

How to increment and get the next IPv6 network address from the current network address

送分小仙女□ 提交于 2019-12-14 02:28:16
问题 Using standard python packages, how can I get the next few IPv6 network address if we give any IPv6 network address as input. Basically I want to iterate over the network address which was given and on each iteration it should increment and get the next network For example, if my start network address 4001:1::/32, then on each iteration I would like to get the next network address as 4001:2::/32, 4001:3::/32, 4001:4::/32 and so on. >>> inet = iterate_on('4001:1::/32') >>> next(inet) 4001:2::

IPV6 Curl POST request

旧街凉风 提交于 2019-12-14 00:35:03
问题 In IPV6 how to build CURL POST http request with the IPV6 address and port number.Any kind of thread will be appreciated. Tried to build the request as below >curl --interface 'http://[2001:0:db8:1111:0:0:0:11]:8091/?' But above gave error as "curl: NO URL specified" >curl -X POST -d curl -X POST `http://[2001:0:db8:1111:0:0:0:11]:8091/?` Then tried the above that gave error as >bash: http://[2001:0:db8:1111:0:0:0:11]:8091/?: No such file or directory curl: no URL specified! curl: try 'curl -