ipv6

IPv6进阶

由 主宰稳场 提交于 2020-01-01 03:25:15
IPV6报文部分字段介绍 1、没有校验和字段： 优点：当TTL减少时，不需要重新处理，相对于IPV4能减少处理的时间； 缺点：必须在上层包含校验和 2、下一个报文： 可指向扩展报文；（大部分节点不处理和查看大部分扩展选项） 常见的扩展报文：1、逐跳选项报文(0) 2、目标选项报头(60) 3、路由选择报头(43) 4、分段报头 5、身份验证报头（AH-51）6、封装安全有效负载（ESP-50）7、上层报头（6/17） MTU发现过程 源设备将使用发现过程来确定应在会话中使用的最佳MTU，IPV6源设备尝试以上层指定的长度发送分组；若源设备收到ICMPV6消息“分组太大”它将使用更小的MTU重传MTU分组反复执行此过程，设备将设置会话的MTU，设备每5min钟执行一次MTU发现，IPV6上层会接收到IPV6层发送的有关MTU调整的通知，如果上层由于某种原因不接受，IPV6则对大报文进行分段机制。 Ipv6编址： 1、单播：除多播外的地址均为单播地址 全局单播地址：2000::/3 链路本地单播地址：fe80::/10 + EUI-64 (邻居发现、路由器发现、路由协议、自动地址配置) 2、多播：FF00::/8 （4位范围：节点、链路、场点、组织、全局）多播分组中没有TTL字段 FF02:1 链路上的所有节点 FF02:2 链路上的所有路由器 FF02:9

is there any code for bitwise and ipv6 address and network mask (prefix)?

由 核能气质少年 提交于 2020-01-01 02:43:10
问题 I want to ask about calculation of ipv6 network and host side. For example, I have the IPv6 address 2001:470:1f15:1bcd:34::41 and prefix 96 . Do you know a easy way to do bitwise and between IPv6 address and prefix? According to IPv4: 192.168.1.2 255.255.255.0 network : 192.168.1.0 So simple. I want to do the same thing to IPv6 address. But IPv6 address is 16 bytes, so you can't use unsigned int for that. Is there any API to do this? Or should I use arrays? 回答1: Calculate mask from prefix

【转】太厉害了，终于有人能把TCP/IP协议讲的明明白白了！

由 ◇◆丶佛笑我妖孽 提交于 2020-01-01 02:09:35
【转】太厉害了，终于有人能把TCP/IP协议讲的明明白白了！ 一、 计算机网络体系结构分层 二、 TCP/IP 基础 1. TCP/IP 的具体含义 2. 数据包 3. 数据处理流程 三、传输层中的 TCP 和 UDP 1. 端口号 2. UDP 3. TCP 四、网络层中的 IP 协议 1. IP 地址 2. 路由 3. IP 分包与组包 4. IPv6 5. IP 协议相关技术 从字面意义上讲，有人可能会认为 TCP/IP 是指 TCP 和 IP 两种协议。实际生活当中有时也确实就是指这两种协议。然而在很多情况下，它只是利用 IP 进行通信时所必须用到的协议群的统称。具体来说，IP 或 ICMP、TCP 或 UDP、TELNET 或 FTP、以及 HTTP 等都属于 TCP/IP 协议。 一图看完本文 一、 计算机网络体系结构分层 太厉害了，终于有人能把TCP/IP 协议讲的明明白白了 计算机网络体系结构分层 计算机网络体系结构分层 不难看出，TCP/IP 与 OSI 在分层模块上稍有区别。OSI 参考模型注重“通信协议必要的功能是什么”，而 TCP/IP 则更强调“在计算机上实现协议应该开发哪种程序”。 二、 TCP/IP 基础 1. TCP/IP 的具体含义 从字面意义上讲，有人可能会认为 TCP/IP 是指 TCP 和 IP 两种协议

Why request.getRemoteAddr() returns ipv4 or ipv6 depending on context (post query or ajax query)

由 …衆ロ難τιáo~ 提交于 2019-12-31 08:25:11
问题 I've donne a web app with Spring/GWT that uses Flash to upload files. When I send an ajax request with GWT and try to get the user ip address, I get an ipv4 address like: 127.0.0.1 but when I upload my files with flash (and so a post request on the same webapp) I get an ipv6 address 0:0:0:0:0:0:0:1 I use the same code to get the user ip which is: ServletRequestAttributes att = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes(); att.getRequest().getRemoteAddr(); The

Bind Jetty to IPv6 address

由 狂风中的少年 提交于 2019-12-31 01:52:15
问题 I am trying to bind Jetty to listen only to IPv6 address. I am using Jetty 7.4.2.v20110526. my jetty.xml: <Call name="addConnector"> <Arg> <New class="org.eclipse.jetty.server.nio.SelectChannelConnector"> <Set name="host">::1</Set> <Set name="port"><SystemProperty name="jetty.port" default="8070"/></Set> <Set name="maxIdleTime">30000</Set> <Set name="Acceptors">2</Set> <Set name="confidentialPort">8443</Set> </New> </Arg> </Call> the error I get: java.net.SocketException@3d3c4c09: Address

problem running hello world with tornado web server (Python 2.5,Win 7)

由 坚强是说给别人听的谎言 提交于 2019-12-30 09:42:49
问题 I am using Python 2.5 on Windows 7 (64bit). I installed pycurl-7.15.5.1 (with win binaries) and tornado (using pip). When I run the following hello world code: import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello World!") if __name__=='__main__': app = tornado.web.Application([(r"/",MainHandler),]) application.listen(8888) tornado.ioloop.IOLoop.instance().start() I get the following error:- Traceback (most recent call last):

problem running hello world with tornado web server (Python 2.5,Win 7)

由 左心房为你撑大大i 提交于 2019-12-30 09:42:33
问题 I am using Python 2.5 on Windows 7 (64bit). I installed pycurl-7.15.5.1 (with win binaries) and tornado (using pip). When I run the following hello world code: import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello World!") if __name__=='__main__': app = tornado.web.Application([(r"/",MainHandler),]) application.listen(8888) tornado.ioloop.IOLoop.instance().start() I get the following error:- Traceback (most recent call last):

Processing packets with unknown IPv6 extension headers

由 时间秒杀一切 提交于 2019-12-30 06:24:34
问题 Question Should one discard a packet with an unknown IPv6 extension header? Details I could not find an answer to this question by examining the RFC. The book IPv6 Essentials states on page 22: If a node is required the next header but cannot identify the value in the Next Header field, it is required to discard the packet and send an ICMPv6 Parameter Problem message back to the source of the packet. I read this as: a IPv6 packet with a custom extension header cannot will be dropped unless

How to set java.net.preferIPv4Stack=true at runtime?

由 孤人 提交于 2019-12-29 03:26:08
问题 I need to disable IPv6. For that the java documentation indicates setting jvm property java.net.preferIPv4Stack=true . But I don't understand how to do it from the code itself. Many forums demonstrated doing it from the command prompt, but I need to do it at runtime. 回答1: You can use System.setProperty("java.net.preferIPv4Stack" , "true"); This is equivalent to passing it in the command line via -Djava.net.preferIPv4Stack=true 回答2: Another approach, if you're desperate and don't have access

How to set java.net.preferIPv4Stack=true at runtime?

由 北城余情 提交于 2019-12-29 03:26:02
问题 I need to disable IPv6. For that the java documentation indicates setting jvm property java.net.preferIPv4Stack=true . But I don't understand how to do it from the code itself. Many forums demonstrated doing it from the command prompt, but I need to do it at runtime. 回答1: You can use System.setProperty("java.net.preferIPv4Stack" , "true"); This is equivalent to passing it in the command line via -Djava.net.preferIPv4Stack=true 回答2: Another approach, if you're desperate and don't have access
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