linux trace network traffic

Basic Network ConfigurationTo connect a Linux host to a network, you need to configure network-related settingsGenerally include the following:Host NameIp/netmaskRouting: Default gatewayDNS ServerPrimary DNS ServerSecondary DNS serverThird-party DNS serversTo modify the NIC naming example:1. Check the driver of the

Tags: background service 17. Statistical information Work HTML nstat-o about interactive18 Common commands for monitoring network bandwidth on a Linux serverThis article describes some of the Linux command-line tools that you can use to monitor network usage. These tools can monitor data transmitted over a

Tags: stat security ifup OOP Erro Linux. NET make remote connectiontraceroute Command (Unix)/tracert command (Windows)The format of the TRACERT command is: tracert [-d] [-h maximum_hops] [-j host-list] [-w timeout] [-r] [-S srcaddr] [-4] [-6] target_name.①,-DIndicates that the address is not resolved to a host name.②,-h maximum_hopsRepresents the maximum number of hops for a search target.③,-j host-listRepresents a loose source route along with the ho

Listening State Network Service -A: Lists all the networks netstat-rn ; -r: List routing lists, features and route command consistent 3.route command # View routing list (see Gateway) Route-n # Temporary Settings Gateway Route add default GW 192.168.1.1 2-2. Network Test Command (1). ping command# probe the network condition of the specified I

@223.5.5.5 www.oldboyedu.com +trace ==> Show the complete process of domain name resolution to IPDig +nocmd +nocomment +nostat ww.oldboyedu.com ==> streamlining some explanatory information Host Domain name query tool-A displays detailed DNS information-t specifies the type of domain name information for the query, or it can be "A", "All", "MX", "NS", etc.Nmap Network Detection Tool and security/port scann

network cards that belong to a single host Ethernet card are the same, Because the host Ethernet card is not using the MAC address to divert traffic from the Ipvlan virtual network card at all. The specific process is as follows:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/6C/F0/wKioL1VYMMvAWkwbAAOyO_EK5Tw383.jpg "title=" Ipvlan.jpg "alt=" Wkiol1vy

Network monitoring tools are an important feature for businesses of any size. The objectives of network monitoring may vary widely. For example, the goal of monitoring activities can be to ensure long-term network services, security protection, performance troubleshooting, Network usage statistics. Because of its diffe

different. Or the way it is illustrated:1.bridge modeThis bridge is only for the Macvlan Nic that belongs to a host Ethernet card and the communication behavior between the host NIC, regardless of the external communication. The so-called Bridge refers to the network between these cards, the data flow can be directly forwarded, do not need external assistance, which is somewhat similar to the Linux box bui

FORWARD DROP [Root @ linux-tys root] # iptables-a output-j ACCEPT-o lo-these two actions allow internal network traffic on the send-back Interface [Root @ linux-tys root] # iptables-a input-j ACCEPT-I lo [Root @ linux-tys root] # iptables-a output-j ACCEPT-o eth1-p tcp-m st

tools capture separate packages on the link, analyze their content, and display decoded content or packet-level statistics. These tools monitor and manage the network at the lowest level, as well as the most granular monitoring, at the expense of the process of affecting network I/O and analysis.Dhcpdump: A command-line DHCP traffic sniffing tool that captures D

First, let's take a look at the diagram of a major multi-queue network card (E1000) with multi-core CPUs: Non-multiple queues: The Linux network card is represented by the structure body Net_device, one of which corresponds to a dispatch packet sending queue. The entity of the packet is Sk_buff (SKB) in the kernel, in the form of: Multiple queues: A

billing object is an IP address, which is prone to IP address theft to avoid billing, some schools use vswitches with strong functions to bind the ports of vswitches to IP addresses, although this method can restrict IP theft to some extent (it cannot be completely eliminated, in Linux, you only need ifconfig to modify the MAC. In windows, you need to modify the key value in the registry, this allows users to access the Internet only on the bound com

(loopback), 127.0.0.1 ifup, ifdownEnable, disable an interface Configure Network Informationsetup(CentOS)Network-related configuration files Nic configuration file: /etc/sysconfig/network-scripts/ifcfg-eth0 (CentOS) DNS configuration file:/etc/resolv.conf Hostname configuration file:/etc/hostname static hostname configuration

18 Common commands for monitoring network bandwidth on a Linux serverThis article describes some of the Linux command-line tools that you can use to monitor network usage. These tools can monitor data transmitted over a network interface and measure the speed at which data i

files, is the Linux system-level hard limit, when it is not enough to increase its size3. There is also a reason why a TCP connection cannot be established because the ip_table firewall of the Linux network core has a limit on the number of TCP connections that can be traced. At this point the program will appear to block in the Connect () call, as if the crash,

. required by the device. The Stop () function is the function of stopping the network interface device.netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb, struct net_device *dev);Initiating the sending of a packetvoid (*ndo_tx_timeout) (struct net_device *dev);When a packet is sent out, the function takes steps such as restarting the packet sending process or restarting the hardware to restore the network

Several virtual NICs related to Linux Network virtualization-VETH/MACVLAN/MACVTAP/LANLinux Nic drivers contain many "virtual NICs ". Earlier articles have analyzed in detail virtual network adapters such as tun and ifb. Similar ideas: Under the trend of virtualization, the Linux source code tree is constantly increasin

Diagram of several virtual NICs related to Linux Network virtualization-VETH/MACVLAN/MACVTAP/LAN,-vethmacvlanLinux Nic drivers contain many "virtual NICs ". Earlier articles have analyzed in detail virtual network adapters such as tun and ifb. Similar ideas: Under the trend of virtualization, the Linux source code tree

I. Introduction to the ConceptNetwork programs are divided into server-side programs and client programs. The service side is the one that provides the service, and the client is the party requesting the service. But the reality is that some programs of the client, server-side role is not so obvious, that is, mutual client and service side. When we write a network program, it is generally based on TCP protocol or UDP protocol for

This is a creation in Article, where the information may have evolved or changed. The research on the container network has been interrupted for some time due to the reasons for the exchange of work in 2016. With the current project to kubernetes application in depth, I feel that before the shallow understanding of the container network is not enough, the container netw