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Common knowledge points in the network operation commands frequently used in network troubleshooting ping: Check local and external connectivity netstat: Spread open port nbtstat: Enable service net: config view running service telnet: in the OSI

New Understanding of TCP/IP (4) some basic terms in TCP/IP, such as MSL, TTL, and RTT. MSL (max segment lifetime) indicates the maximum message survival time, that is, the maximum time for a packet to exist on the network. packets exceeding this

========================================================== ========================================================== ============================================ 1. Accept: indicates the media type that the WEB Server accepts. */* indicates any

IP data HeaderThe IP header is as follows. Analyze each field one by one.The four-digit version field indicates IPv4 or IPv6.The length of the four-digit radical represents the length of the IP radical.Eight-bit service type: the service type (TOS)

How to Create a VPN connection1. Right-click "Network neighbors" and choose "properties" to create a new connection"2. Next Step3. Connect to my workplace Network4. Virtual Private Network (VPN)5. Enter the company name or leave it blank.6. Do not

Overview of TCP network knowledgeTCP status transition diagramTCP packet headerThree-way handshakeClient serverSYN_SENT --------- syn j --------->--------- Ack k + 1 ------->ESTABLISHEDThe SYN packet may contain the following information:MSS

MPLS/VPN experiment: This experiment is based on the previous OSPF/STATIC configuration. You can use this experiment to change the configuration. The configuration that needs to be changed is the protocol between CE-PE and between PE-P-PE. delete

MPLS/VPN Experiment 1: OSPF/STATIC terms related to some MPLS here are not explained. Jump directly to the experiment section. The IGP protocol used between pe-p is OSPF, while the Protocol used between CE-PE is static. the following figure shows

Ipv4 private address ipv4 address, which has four 8-bit binary numbers. For convenience, it is often expressed in decimal number. The range of 8-bit binary is 0-255. In this way, there can be a total addressing range of 4 GB. There are three private

IPPROTO_IP, IPPROTO_RAW protocol for socket (AF_INET, SOCK_RAW, IPPROTO_IP), its prototype is int socket (int domain, int type, int protocol ); 1 The protocol parameter is used to specify the protocol package to be received. If it is a non-0 or non-2

Use the netsh command to disable the Enable nic. in the XP system, the netsh interface set interface name command extension is not supported. Therefore, this command cannot run normally, and ifmon Under 2003 is extracted. dll file overwrite, you can

The TCP/IP structure corresponds to the abbreviation of OSI Transmission Control Protocol/Internet Protocol, it is the most basic protocol of the Internet and the basis of the Internet international network. It consists of the IP protocol at the

Net use command 1) Create an empty connection: net use \ IP \ ipc $ ""/user: "" (note: this line of command contains 3 spaces) 2) create a non-empty connection: net use \ IP \ ipc $ "password"/user: "username" (there are also 3 spaces) 3) ing

The Application of ICMP Protocol Ping command ICMP is Internet Control Message Protocol, which is a sub-Protocol of the TCP/IP Protocol family and belongs to the network layer Protocol, it is used to transmit control messages between IP hosts and

[Transport layer] UDP knowledge 1. UDP introduction UDP is a transport layer protocol, which is in a layer with the TCP protocol, but unlike the TCP protocol, UDP does not provide timeout retransmission, error retransmission and other functions,

In iptables, DNAT and SNAT are commonly called Destination ing. SNAT (Source Network Address Translation) is usually called Source ing. This is the two methods that we often use when setting the Linux gateway or firewall. I have not clearly

About iptables u32 Matching 1. packet-based routing load balancing can achieve packet-based routing load balancing even if no statistic match is used. The answer is u32. The IP header has no other fields. The only field is the ID field. We know that

TCP/IP protocol cluster BASICS (1) network interface layer: the basic layer of the model, responsible for sending and receiving data frames (frame is an independent network information transmission unit ). The Network Interface Layer places frame

OSPF AREA verification simple configuration simple AREA verification Step 1 interface configuration verification required KEY ip ospf authentication-key ciscoip ospf message-digest-key 1 md5 ciscoac // enable MD5 KEYstep2 in the ospf Process enable

The structure of an IP data packet is called an IP data packet based on the IP protocol. It is not hard to imagine that it must include IP address information. An Ethernet packet only contains the MAC address and does not have the IP address field.