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NBMA Network Dynamic IPsec VPN R1-sever # show runip domain name sina.com !! Username sunzhixiong password 0 cisco !! Crypto isakmp policy 10 hash md5 authentication pre-share group 2 lifetime 3600 crypto isakmp key ilovetg2008 address 172.16.10.0 25

The small setup Company, which ignored the exchange of LAN computers, had 10 new office computers. It had been busy installing, configuring, networking, and updating for a day. After busy work, I just wanted to rest and my colleagues called again.

New Understanding of TCP/IP protocol (1) New Understanding of TCP/IP protocol layers link layer transfers data to different physical entities based on different MAC addresses; the IP layer distributes data to different network entities based on

Common network concepts 1. DHCP Dynamic Host Configuration Protocol (DHCP) is a LAN network Protocol that uses UDP for two purposes: IP addresses are automatically assigned to internal networks or network service providers, and users or internal

TCP handshake/waving Process AnalysisIn TCP/IP, TCP provides reliable connection services and uses three handshakes to establish a connection.The server must be prepared to accept external connections. This is done by calling the socket, bind, and

Basic Introduction to IPv6 (1)IPv6 VS IPv4 advantagesLIPv6 has a larger address space. In IPv4, the specified IP address length is 32, that is, 2 ^ (32-1) (symbol ^ indicates power-up, the same below) addresses, while in IPv6, the IP address length

Two network transmission models: 1. message transmission may be large or small. If a large file is transmitted in a continuous data stream, this may mean that if a device loses part of the communication, the entire file needs to be re-transmitted

OSPF protocol troubleshooting 2 08. What are common LSA types of OSPF? What are the specific functions of each LSA? Router LSA: LSA generated by the router itself, including its own links and interface status information network LSA: generated by

IPTable-related Understanding records Iptable processing mechanism IPTable is a packet filtering mechanism, which is supported and pre-installed in Linux kernel Versions later than 2.4.xx, previously, linux with 2.2.xx as the core mainly used

System learning TCP/IP protocol (ii) ------ establish and disable TCP reliable transmission is first established on the establishment and closure of reliable connections, which includes the following points: TCP three-way handshake established

The minimum RTSP Protocol is required to support RTSP Streaming Media for videos in the project. This article is translated from the RFC2326 protocol document Appendix D: Minimal RTSP implementation section of RTSP. 1. The client must implement: 1.

Several Basic concepts of the network today began to learn the basics of network interconnection. I found myself vague in some devices and network concepts. The first is the Broadcast Domain and Collision Domain ). In short, a broadcast domain is a

Explanation of TCP/UDP data packets (5): UDP data packet instance parsing interpretation of TCP/UDP data packets (4): TCP data packet instance Parsing http://www.bkjia.com/net/201307/224717.html 1. A complete UDP packet 20:15:23. 534101 IP 38_29_3g.3

Gateway of network management-basic of the White Paper everyone knows that a door is required to walk from one room to another. Similarly, sending information from one network to another must go through a "Gateway", which is the gateway. What is a

[Transport layer] Transport Control Protocol (TCP) 1. Main Features of TCP 1) connection oriented 2) point-to-point 3) reliable delivery, error-free, no packet loss, no duplication, on-demand arrival 4) full-duplex communication. Both the receiving

Mtu mss explains MTUMTU, that is, Maximum Transmission Unit (Maximum Transmission Unit), which sets the Maximum Transmission Unit for data reporting over TCP/IP. Setting an appropriate MTU value can solve problems such as "some websites cannot be

During Vlan forwarding, untag is a common ethernet packet. The NIC of a common PC can identify such packets for communication. The structure of the tag packet is changed after the source mac address and the target mac address, 4-bytes vlan

An Ethernet NIC (MAC + PHY) consists of two layers of the OSI (open-end system interconnection) model. Physical Layer and data link layer. The physical layer defines the electrical and optical signals, line statuses, clock baselines, data encoding,

Notes on data communication and network-IPv4 VS IPv6The IPv4 datagram format is as follows:Version: the version that identifies the current datagram.Header Length: defines the total length of the datagram header in 4 bytes. If the field value is 5,

A brief review of TCP/IP protocol cluster Layer 4: network interface layer, Internet layer, transmission layer and application layer. five layers are also mentioned in some books. now let's separate the physical layer: The Protocols related to