ipv4

2019 SDN上机第7次作业

由 余生长醉 提交于 2019-12-11 19:16:41
1.补充并运行basic代码 任务是实现基础的交换机转发数据包功能 补充后代码如下： /* - - P4_16 - - */ include <core.p4> include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen;

2019 SDN上机第7次作业

由 限于喜欢 提交于 2019-12-11 19:02:53
1.补充并运行basic代码 任务是实现基础的交换机转发数据包功能 补充后代码如下： /* -*- P4_16 -*- */ #include <core.p4> #include <v1model.p4> const bit<16> TYPE_IPV4 = 0x800; /************************************************************************* *********************** H E A D E R S *********************************** *************************************************************************/ typedef bit<9> egressSpec_t; typedef bit<48> macAddr_t; typedef bit<32> ip4Addr_t; header ethernet_t { macAddr_t dstAddr; macAddr_t srcAddr; bit<16> etherType; } header ipv4_t { bit<4> version; bit<4> ihl; bit<8> diffserv; bit<16> totalLen

Getting IP address list between two IP addresses

由 别说谁变了你拦得住时间么 提交于 2019-12-11 18:21:20
问题 I am writing a program that gets From IP address and To IP address from the user and displays the list of IP addresses between them. For example, if the user gives 10.0.0.1 and 10.0.0.5 then I will display the five IP addresses between these two. The current solution that is coming in my mind are: To have a list of all IP addresses and then look for the resultant IP address list Use a nested loop What solution should I adopt between these (or suggest a better solution)? For the first solution

Nginx not starting when IPv6 is not enabled in host machine

由 烈酒焚心 提交于 2019-12-11 17:36:34
问题 I am currently configuring a software to be able to handle IPv6 addresses, I have also configure the Nginx docker image so that it can handle both IPv4 and IPv6 address. The problem that I encounter is that I am not sure if the host machine where the software is going to be deployed has IPv6 enabled or not. The issue is that whenever the IPv6 is not enabled in the host machine it is causing the error below. nginx: [emerg] socket() [::]:8080 failed (97: Address family not supported by protocol

Is an IP address with an octet given by 4 or more zeros a valid IP address?

由 三世轮回 提交于 2019-12-11 11:26:27
问题 The top voted answer for validating IP addresses here ( which is a regex, so automatically unfavourable ) returns false if you give it an IP address with 4 or more zeros in a single octet. Note that it passes with 3 or less, which in my opinion, automatically indicates code smell due to arbitrary inconsistency (after all it's not base 8 and so there is nothing special about 3 in base 10). Nevertheless, surprisingly the apache commons utility InetAddressValidator also has this behaviour (at

linux内核参数注释与优化

由 折月煮酒 提交于 2019-12-11 09:01:33
linux内核参数注释与优化 记录好文章。 https://blog.51cto.com/yangrong/1567427 目录 1、linux内核参数注释 2、两种修改内核参数方法 3、内核优化参数生产配置 参数解释由网络上收集整理，常用优化参数对比了网上多个实际应用进行表格化整理，使查看更直观。 学习linux也有不少时间了，每次优化linux内核参数时，都是在网上拷贝而使用，甚至别人没有列出来的参数就不管了，难道我就不需要了吗？ 参考文章： linux内核TCP相关参数解释 http://os.chinaunix.net/a2008/0918/985/000000985483.shtml linux内核参数优化 http://blog.chinaunix.net/uid-29081804-id-3830203.html linux内核调整和内核参数详解 http://blog.csdn.net/cnbird2008/article/details/4419354 1、linux内核参数注释 以下表格中红色字体为常用优化参数 根据参数文件所处目录不同而进行分表整理 下列文件所在目录：/proc/sys/net/ipv4/ 名称 默认值 建议值 描述 tcp_syn_retries 5 1 对于一个新建连接，内核要发送多少个 SYN 连接请求才决定放弃。不应该大于255

Dns.GetHostAddresses() only returns IPv6 addresses . How to get Local IPv4?

由 不羁的心 提交于 2019-12-11 07:45:18
问题 According to Dotnet reference , Dns.GetHostAddresses("") should return IPv4 addresses . However I am getting only IPv6 on my windows 7 machine. I tried the program on a different windows 7 still the same result. It only returned IPv4 correctly on an XP machine. If I try , Dns.GetHostEntry(""); It now correctly returns one IPv4 and one IPv6 . How do I get IPv4 from GetHostAddresses() because I don't want to use GetHostEntry(). It looks up the DNS. Also, say for a computer with 1 Network card,

Banning by IPv4 and IPv6

由 北城余情 提交于 2019-12-11 03:47:09
问题 If I want a ban a user by IP in my website, is it possible to do it by both IPv4 and IPv6 ? Some browsers apparently use IPv4 addresses by default and others, if they have the possibility, use IPv6 addresses. So, if I ban someone by their current IP, they would only have to user another navigator to bypass the ban. tl;dr: is it possible to translate IPv4 addresses to IPv6 or something like that to "unify" them? I'm using PHP as the server-side technology. 回答1: No, it isn't really possible.

merging of multiple IPv4 address blocks on the basis of their country region

由 ⅰ亾dé卋堺 提交于 2019-12-11 02:16:08
问题 I have IPv4 blocks in the CIDR notation form. These blocks are divided on the basis of city I want to merge them one level up I mean till region level e.g 12.17.230.48|12.178.230.63|US|Texas|Temple 12.178.230.64|12.178.230.95|US|Texas|Abilene 12.178.230.96|12.178.230.111|US|Texas|Jayton 12.178.230.112|12.178.230.119|US|Texas|Wichita Falls 12.178.230.120|12.178.230.127|US|Texas|Mansfield 12.178.230.128|12.178.230.159|US|Texas|Waco (Bellmead) 12.178.230.160|12.178.230.167|US|Texas|Irving 12.178

OCLinEcore and Regex to create valid IPv4 string

由 北城余情 提交于 2019-12-11 01:11:31
问题 I have an Ecore model, where I'm trying to add some OCL constraints. My problem comes when I try to make a property (a string) that is in valid IPv4 form. I guess I should use a regular expression, but I have no idea at all about how to use regex on OCLinEcore. 回答1: As of Eclipse Juno, you can use regular expressions in OCL. The function to call on it is matches(regex), just like in Java. context Packet inv ValidIPv4 : ip.matches('\b([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\b')
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