iNet

第四章 通知链

杀马特。学长 韩版系。学妹 提交于 2019-12-26 11:21:50
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 通知链是一份函数列表,当给定事件发生时予以执行。列表中的每个函数都让另一个子系统知道,调用此函数的子系统内所发生的一个事件或子系统所侦测到个一个事件。 通知链使用发布-订阅(publish-and-subcribe)模型: 被通知者 ——接收某事件的子系统,提供回调函数予以调用 通知者 ——感受到一个事件并调用回呼函数的子系统 通知 通知链列表元素的类型是notifier_block,定义: /* * notifier_call 要执行的函数 * next 链接列表的元素 * priority 优先级 */ struct notifier_block{ int (*notifier_call)(struct notifier_block *self, unsigned long, void *); struct notifier_block *next; int priority; } 网络子系统通知链: inetaddr_chain ——发送有关本地接口上的IPv4地址的插入、删除以及变更的通知信息 inet6addr_chain —— 发送有关本地接口上的IPv6地址的插入、删除以及变更的通知信息 netdev_chain —— 发送有关网络设备注册状态的通知信息 /*struct nofitier

Omnet access method of another submodule error - no matching function for call to ‘check_and_cast(cModule*&)’

强颜欢笑 提交于 2019-12-25 03:32:07
问题 Error: no matching function for call to ‘check_and_cast(cModule*&)’ I am trying to use the current position from another module "mobility" with n class type MassMobility. cModule* parentmod = getParentModule(); cModule* mobilitymod = parentmod->getParentModule()->getSubmodule("mobility"); EV<<"Current module is "<<mobilitymod->getFullName() <<endl; MassMobility* mobility = check_and_cast<MassMobility *>(mobilitymod); mobility->getCurrentPosition(); I am getting compile time error :- no

ssh免密码登录配置

烈酒焚心 提交于 2019-12-24 14:40:55
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 生成秘钥对 [root@localhost ~]# ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: SHA256:D0kugFN+1mryj+fpOrQ5vzZSsLr/jKnTmm26fJvqb7g root@localhost.localdomain The key's randomart image is: +---[RSA 2048]----+ | . | | + . | | o o o o | | . +.+ . | | . +oS | | +o..o | | =.+ . | | .+o@B+. | | .E/@&Xo |

PostgreSQL convert column from inet to text

别来无恙 提交于 2019-12-23 23:31:25
问题 I'd like to change type of column from inet to text . So, I execute: ALTER TABLE table ALTER COLUMN col TYPE text; But then I found out that for all values was added mask. For example: 192.168.100.141 -> 192.168.100.141/32 . Is it possible to change inet column to text without any changes in this column? 回答1: Use host() to extract just the ip address: ALTER TABLE table ALTER COLUMN col TYPE text USING host(col); 来源: https://stackoverflow.com/questions/29101458/postgresql-convert-column-from

Veins - INET compatibility

北城以北 提交于 2019-12-23 05:39:27
问题 I’m currently searching for 802.11p simulation feasability and I would like to test IPv6 as well, apart from the WAVE/IEE 802.11p. The INET would be the solution but I’m doubting about the compatibility with the Veins 4 alpha 2 (latest version). What I know is that Veins 3.X was based on MiXiM, but at the same time INET and MiXiM can be compatible and installed together in OmNET, combining them or even with MixNET. I would really like to know if somebody has achieved them work al together

How could nodes receive packets from sensors and on the other hand send them to Mobile Elements?

泪湿孤枕 提交于 2019-12-20 06:20:57
问题 I am using OMNet++ to simulate a wireless network. The scenario is : "sensor nodes send sensory data to some nodes (called RN)(send to the nearest RN). and some mobile elements collect data from these points." sensors distribute uniform in field and position of RNs are determined.also MEs follow BonnMobility with predefined path. I'm using omnet 5.4 with inet 3.6. numHost=500 ** numME=5 ** numRN=50 NED file: network MyNet { parameters: int numHost; int numME; int numRN; string hostType =

How do I use MaxMind's GeoIP database to determine location?

倖福魔咒の 提交于 2019-12-20 05:47:07
问题 So, I was told in my previous question that I can use the databases provided by MaxMind to determine locations. So, I got their databases downloaded from their site. They are csv files and open up in Excel. InetAddress ip = InetAddress.getLocalHost() is how I get the IP of my computer. From there I do String justIP = ip.getHostAddress() My question is: How do I resolve justIP to a city location using the DB I just downloaded ??? I am new to this so a little help will be appreciated. One of

PostgreSQL IP address: Search the right result by inet data?

孤人 提交于 2019-12-20 03:54:21
问题 I have a problem on PostgreSQL when asking if a given IP address ( inet type) search the right result in the database. I will provide step by step what I'm doing. CREATE TABLE public.test ( ip inet, a character varying ); INSERT INTO public.test (ip, a) VALUES ('1111:0000:0101:000A:0002:0003:0004:0005', 'admin1'), ('1111:0001:0101:000A:0002:0003:0004:0005', 'admin2'), ('1111:0011:0101:000A:0002:0003:0004:0005', 'admin3'), ('1111:0111:0101:000A:0002:0003:0004:0005', 'admin4'), ('1111:1111:0101

Docker中的网络

99封情书 提交于 2019-12-19 20:50:51
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 从Linux中的网络说起 namespace 之间的连通性 namespace 是 Linux 2.6.x 内核版本之后支持的特性,主要用于资源的隔离。有了 namespace,一个 Linux 系统就可以抽象出多个网络子系统,各子系统间都有自己的网络设备,协议栈等,彼此之间互不影响。 如果各个 namespace 之间需要通信,怎么办呢 # 查看网卡信息 ip link show # 或者 ip a # 网卡配置目录 cd /etc/sysconfig/network-scripts/ #给网卡添加临时ip ip addr add 192.168.xxx.xxx/24 dev eth0 #删除ip ip addr delete 192.168.xxx.xxx/24 dev eth0 将网卡进行隔离 # 创建 network namespace ip netns add ns1 # 查看 ip netns list # 查看当前namespace的网卡信息 ip netns exec ns1 ip a # 启动网卡 ip netns exec ns1 ifup lo veth pair技术(virtual Ethernet Pair) eth-pair 就是一对的虚拟设备接口,和 tap/tun 设备不同的是

How to change configuration of network during simulation in OMNeT++?

孤街浪徒 提交于 2019-12-19 10:52:25
问题 I want to modify some parameters of element's .ini file in OMNeT++, say a node's transmission rate, during the simulation run, e.g. when a node receives some control message. I found information saying that it's possible to somehow loop the configuration stated as: some_variable = ${ several values }, but there are no conditional clauses in .ini files and no way to pass to those files any data from C++ functions (as far as I'm concerned). I use INET, but maybe some other models' users already