detailed network statistics

 This article and related series is my summary of the iOS network development knowledge Point, this article is the second one, mainly analyzes several important classes in cocoa streamsCocoa streams is actually a simple package of objective-c for Cfnetwork, consisting mainly of three classes: Nsstream, Nsinputstream, and Nsoutputstream. The interface of this section is simple and the usage is very clear. I'll just list the interfaces here for easy a

The call stack of the 1.AF Initbaseurl-[Afhttpsessionmanager Initwithbaseurl:] -[Afhttpsessionmanager initwithbaseurl:sessionconfiguration:] - [Afurlsessionmanager initwithsessionconfiguration:] -[nsurlsession SessionWithConfiguration:delegate:delegateQueue:] -[Afjsonresponseserializer serializer]// Responsible for serialization response -[Afsecuritypolicy defaultpolicy]//responsible for identity authentication -[Afnetworkreachabilitymanager

(TSO) causes the TCP/IP stack to emit very large frames (up to KB), even if the maximum Transmission Unit (MTU) of the interface is smaller. The network adapter then divides the larger frame into the MTU-sized frame and presets an adjusted copy of the initial TCP/IP header. Ii. Management of VMware vsphere standard switchesIii. managing VMware vsphere Distributed SwitchesIv. Understanding third-party virtual switchesThis article is from the "Xiexiaoj

Linux network firewall: Detailed description of iptables configuration, linuxiptables1. Start Configuration Let's configure a filter table firewall. (1) view the settings of IPTABLES on the local machine[Root @ tp ~] # Iptables-L-nChain INPUT (policy ACCEPT)Target prot opt source destination Chain FORWARD (policy ACCEPT)Target prot opt source destination Chain OUTPUT (policy ACCEPT)Target prot opt source de

. Evdev_read3. Assuming that the message queue is empty, the upper process will sleep until it is woken up for message reading. Who's going to wake it up? Initiated by the hardware interrupt of the underlying input-device, the wake-up signal is emitted when the touchscreen message is eventually delivered to the message queue. The external hardware interrupt service function that is registered in Tsc2007_probe is the initiator.Take a look at the Interrupt service function TSC2007_IRQ:Ts-work is t

3.0AFHTTPSessionManager *session = [Afhttpsessionmanager manager]; [Session get:@ "requested URL" Parameters:nil success:^ (nsurlsessiondatatask *task, id responseobject) { NSLog (@ "Success");} failure:^ (Nsurlsessiondatatask *task, Nserror *error) { NSLog (@ "failed"); }];5.Get RequestAfhttpsessionmanager *manager = [Afhttpsessionmanager manager]; [Manager get:@ "Http://example.com/resources.json" Parameters:nil progress:nil success:^ (nsurlsessiontask *task, ID Responseo

With ipconfig, you can view information about IP configuration in the command prompt. If you want to know more detailed network configuration information, just add the "/all" option later. When the command runs, it displays all information about the machine, such as the computer name, node type, whether IP routing is activated, whether to activate the WINS proxy server, the

Masquerade/Sbin/iptables -- append forward -- In-interface eth1 (enter the Internet IP address network port here) -- match state -- State established, related -- jump accept/Sbin/iptables -- append forward -- source Intranet CIDR Block A/19 -- jump accept/Sbin/iptables -- append forward -- source Intranet CIDR Block B/18 -- jump accept/Sbin/iptables -- append forward -- source Intranet CIDR Block C/24 -- jump accept/Sbin/iptables -- append forward --

Java was originally introduced as a network programming language, which provides a high degree of support to the network, which makes the communication between client and server become reality, and in network programming, the socket is the most used. Like everyone familiar with the QQ, MSN has used the socket-related technology. Now let's uncover the mystery of t

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CentOS 7.0 System Installation configuration steps detailed Note: As of the current centos7.x version of CentOS 7.0, the following describes the CentOS 7.0 of the specific installation configuration process server-related settings are as follows: Operating system: CentOS 7.0 64-bit IP address: 192.168.21.128 Gateway: 19 2.168.21.2 dns:8.8.8.8 8.8.4.4 Note: If the production server is large memory (more than 4G memory), it is recommended to install t

]=cnt; - for(u=pre[v];u!=v;u=pre[u]) theid[u]=cnt;Bayi } the } the if(cnt==0)//If there is no ring end program - break; - for(intI=1; I//Number the rest of the not in the Ring. the if(id[i]==-1) theid[i]=++cnt; the for(intI=1; I//Create a new diagram the { - intu=edge[i].u; the intv=edge[i].v; theedge[i].u=id[u]; theedge[i].v=id[v];94 if(edge[i].u!=Edge[i].v) theedg

to verify the certificate, the first step to verify the domain name validity and other information, The second step is to compare whether the certificate returned by the server is consistent with the return of the client.AfsslpinningmodepublickeyThis mode is also verified by the certificate binding method, the client must have a copy of the certificate of the server,Only verify the public key in the certificate, do not verify the validity of the certificate, and other information. As long as th

1. Obtaining a Certificate Dev/null 2 > /dev/null | OpenSSL x509-outform DER > Https.cer "in the colon is the main part of the command. This command will form the public binary certificate of the google.com site, named Https.cer, under the current path. You can replace www.google.com with your own site to get the https.cer of your own site.2. Certificates added to the project3. The code usedAfsecuritypolicy *securitypolicy = [[Afsecuritypolicy alloc] init]; [SecurityPolicy Setallowinvalidcertifi

" datausingencoding:nsutf8stringencoding]]; [Data appenddata:[@ "\ r \ n" datausingencoding:nsutf8stringencoding]]; [Data appenddata:[@ "Litterl" datausingencoding:nsutf8stringencoding]; [Data appenddata:[@ "\ r \ n" datausingencoding:nsutf8stringencoding]]; /******************************************************************///Add end tag [data appendData : [@ "------webkitformboundaryufnah6losnxu4xdq--" datausingencoding:nsutf8stringencoding]]; [Data appenddata:[@ "\ r \ n" datau

I. Description of the EnvironmentTo run Consul as a container:through http://192.168.56.1 in : 8500 Visit Consul modify docker02 Span style= "; font-family: Equal line; font-size:14px" > and dockerdaemon configuration file Span style= "; font-family: Equal line; font-size:14px", Docker02 and DOCKER03 are registered in the consul database Vim /ETC/SYSTEMD/SYSTEM/DOCKER.SERVICE.D /10-machine.confRestart Docker daemonSystemctl Daemon-reloadSystemctl Restart DockerTemporary something, cont

Python Pycurl Network Programming example In the use of urllib often die, debug before, is not set timing out so timeout will die.Pycurl is a Curl Python library, although some curl features are not implemented, but they are still strong.Curl is a very powerful tool,Google uses it internally to debug the GDATA API. Using CURL to interact with Google data ServicesYou can go to http://pycurl.sourceforge.net/to download the latest Pycurl. Simple exampl

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, configure router R2Outer>enableRouter#config TerminalRouter (config) #hostname R2Router (config) #int g0/0Router (config-if) #ip add 192.168.3.2 255.255.255.0Router (config-if) #no shutdownRouter (config) #int G0/1Router (config-if) #ip add 192.168.4.254 255.255.255.0Router (config-if) #no shutdownFive, configure the next hop to routeR1 (config) #ip Route 192.168.4.0 255.255.255.0 192.168.3.2R2 (config) #ip Route 0.0.0.0 0.0.0.0 192.168.3.1Six, repeater configurationR1 (config) #int VLAN 10R1

attach to Bridge, the IP of that device becomes invalid, and Linux no longer uses that IP to accept data at layer three. For example, if the eth0 original IP is 192.168.1.2, if you receive a destination address that is 192.168.1.2 data, the Linux application can receive it through the Socket operation. When eth0 is attach to a bridge0, the application cannot accept the above data, although Eth0 's IP is still there. IP 192.168.1.2 should be given to bridge0 at this time. Another thing to note