ip

Why is the maximum port range 65535 in the TCP/IP Suite?

由 ￡可爱￡侵袭症＋ 提交于 2020-03-21 19:06:01
问题 My doubt is that - a port is just logical, so why such restriction ? Why can't I have a port of 9924593 or something like that ? 回答1: Look at the packet format for the TCP segment. The port identifiers are unsigned 16-bit integers, meaning that the largest number you can put in there is 2 16 -1 = 65535. 来源： https://stackoverflow.com/questions/36796183/why-is-the-maximum-port-range-65535-in-the-tcp-ip-suite

Why is the maximum port range 65535 in the TCP/IP Suite?

由 时光总嘲笑我的痴心妄想 提交于 2020-03-21 19:05:45
问题 My doubt is that - a port is just logical, so why such restriction ? Why can't I have a port of 9924593 or something like that ? 回答1: Look at the packet format for the TCP segment. The port identifiers are unsigned 16-bit integers, meaning that the largest number you can put in there is 2 16 -1 = 65535. 来源： https://stackoverflow.com/questions/36796183/why-is-the-maximum-port-range-65535-in-the-tcp-ip-suite

A qestion about socket on different router

由 我只是一个虾纸丫 提交于 2020-03-05 04:41:59
问题 I'm making an android app that i want to publish it on the app store, but the problem it's that i don't know if i can connect my android app to my python code with socket, if i am not on the same router . If i need to do some changes what are they or how can i do if i want that the android app that anyone could download on the app store connects to my python code that's in the same port. for know my code to connect the both programme are try { handler.post( new Runnable() { @Override public

A qestion about socket on different router

由 假如想象 提交于 2020-03-05 04:41:55
问题 I'm making an android app that i want to publish it on the app store, but the problem it's that i don't know if i can connect my android app to my python code with socket, if i am not on the same router . If i need to do some changes what are they or how can i do if i want that the android app that anyone could download on the app store connects to my python code that's in the same port. for know my code to connect the both programme are try { handler.post( new Runnable() { @Override public

同一IP不同端口访问的站点iframe应用session丢失怎么办？

由 自作多情 提交于 2020-03-02 18:19:53
在网站群的建设中，各子站需要共享主站的footer等公共信息。同时主站的后台管理也集成了各子站的管理，采取的方式是使用 iframe 嵌入各站的页面。在本机开发环境中，没有出现任何的问题。但是一放到测试环境中，便遇到 session 丢失的问题。 环境：应用服务器采用tomcat6.0，各个站点单独使用一个应用服务器，部署在一台物理服务器上。外部访问采用同一个IP，但是不同的端口。 起初以为，IE它的安全策略默认是会把iframe中的页面站点认为是不可信任的，它会阻止该站点传过来的 cookie （如果你在iframe中的URL跳转是用的localhost,则不会被阻挡），所以因为没法使用cookie了，session便失效了。解决的方法是在过滤器，或者被嵌入的页面内加入属性为P3P的header信息。 java 为：response.addHeader("P3P","CP=CAO PSA OUR");但是依然没有成功。网上的解决方案都是这么说，况且自己以前还弄过，都成功过，这次怎么弄都不好。 今天脑子安静下来，仔细的分析这里面的原因。如果是IE的安全限制，但是火狐、google浏览器没有这样的限制，为什么这两个浏览器也出现这样的情况。这肯定不仅仅和跨域引起的P3P的安全问题有关。于是在本机测试，通过iframe引入测试环境中的链接，设置了P3P，发现一切正常。这就更说明了

JDBC 连接 scan IP 方式 Oracle 11gR2集群环境

由 淺唱寂寞╮ 提交于 2020-03-02 02:58:47
公司数据库使用 Oracle 11.2.0.4 版本,RAC 环境. 数据库集群:192.168.1.211 (RAC1,SID:wmsdb1),192.168.1.212 (RAC2,SID:wmsdb2). 使用11gR2的scan新特性建了 192.168.1.210( 监听服务名 :wmsdb) 作为scan IP.平时我们通过1.210来操作. 之前尝试通过JDBC直连192.168.1.210 一直连接失败,可以直连192.168.1.211.询问DBA后知道是SCAN方式.属于新特性. 网上找了下参考: http://blog.csdn.net/renfengjun/article/details/8080865 原Oracle连接字符串由: jdbc:oracle:thin:@192.168.1.210:1521:wmsdb 改为: jdbc:oracle:thin:@192.168.1.210:1521/wmsdb 即可.注意最后. 分析原因: 第一种写方是通过SID的方式连接数据库 第二种写法是通过 监听服务名 的方式连接数据 (就是在服务端通过 Net Manager配置的监听名称). 因为SCAN IP 把两个RAC给封装了,但是 SCAN 本身只有 监听服务名 没有 SID,所以只能通过 监听服务名的方式访问 来源： oschina 链接： https:/

PHP: gethostbyname bug

由 只谈情不闲聊 提交于 2020-03-01 01:54:51
问题 I am using gethostbyname() to get the ip address of domains in an application. In some cases invalid addresses like '50.9.49' are checked also. echo gethostbyname('50.9.49'); // returns 50.9.0.49 In this cases gethostbyname should return false or the unmodified invalid ip address. however the functions returns the modified IP address 50.9.0.49 . Looks like a bug in php. The quick fix seems to be to check for invalid numerical addresses before, are there any other suggestions? 回答1: PHP's

What does it mean to bind() a socket to any address other than localhost?

由 北城以北 提交于 2020-02-26 06:51:36
问题 I don't understand what it means to bind a socket to any address other than 127.0.0.1 (or ::1, etc.). Am I not -- by definition -- binding the socket to a port on my own machine.. which is localhost? What sense does it make to bind or listen to another machine or IP address's port? Conceptually, it just doesn't make sense to me! (This has proven surprisingly hard to Google... possibly because I'm not Googling the right terms.) 回答1: Binding of a socket is done to address and port in order to

log4net config file for net.core with UDP Append remote address dynamically

由 天涯浪子 提交于 2020-02-25 06:59:47
问题 I got a log4net file in which I added the following : I want to be able to inject the RemoteAddress variable from my appSetting.json file via the startup.cs page. But I am getting the following error : log4net:ERROR Could not create Appender [UdpAppender] of type [log4net.Appender.UdpAppender]. Reported error follows. log4net.Util.TypeConverters.ConversionNotSupportedException: Cannot convert from type [System.String] value [%propery{RemoteAddress}] to type [System.Net.IPAddress] ---> System

MySQL: How to make a faster IP range query? GeoIP

由 寵の児 提交于 2020-02-25 04:15:12
问题 I have a PHP/MySQL geo-ip script which takes a user's IP address, converts it to long integer and searches through an IP range table for a single geographical location id of where the user's IP is located in: $iplong = ip2long($_SERVER['REMOTE_ADDR']); SELECT id FROM geoip WHERE ".$iplong." BETWEEN range_begin AND range_end ORDER BY range_begin DESC LIMIT 1 The "geoip" table contains 2.5M rows. Both the "range_begin" and "range_end" column are Unique Indexes. IP ranges don't seem to overlap.
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