ipv4 flags

First, IntroductionLet's assume that the hosts discussed in this chapter support dual stacks, that is, support for IPV4 addresses, and Ipv6 addresses.We are talking about the point: the client and server side use different types of addresses.

Maximum Transmission Unit (MTU) refers to the Maximum data packet size (in bytes) that can be passed over a layer of a communication protocol ). The maximum transmission unit parameter is usually related to the communication interface (network

As we all know, IPv6 brings new features to our network. In terms of usage, it also has multiple advantages. Now, we compare the features of IPv4 and IPv6 headers, because there are many differences between IPv6 headers. Let's take a closer look.

Although IPv6 headers have two times the length of 40 bytes and 20 bytes), IPv6 has a simplified header structure. The IPv6 Header has eight fields, while IPv4 has 14 fields. IPv6 discards and uses several IPv4 header fields to make packet

The checksum Algorithm for IPv4, TCP, and UDP checksum calculation of the packet header is a 16-bit accumulated and backward code. The same verification algorithm is also used for TCP and UDP data headers, however, the data involved in the

The Checksum algorithm of the grouping header is the inverse code after 16-bit accumulation and UDP data headers also use the same validation algorithm, but the data involved in the calculation is different from the IP grouping header. The structure

Talk about IPv6-the embarrassing IPv4 1. The embarrassing arp www.2cto.com knew long ago that layer-3 protocols include IP, ARP, ICMP, ARP under IP, and ICMP over IP. Looking at the arp Protocol format, we find that it does not use the IP protocol

We know that after the packet driver processing, call NET_RECEIVE_SKB passed to the specific protocol processing function, for the IPV4 message, its protocol handler function is IP_RCV, IP_RCV after some health checks and other operations, will call

 IP source address IP Destination Address TTL service type (ToS) protocol segment offset IPv4 header keyword segment :. The destination IP address field contains a 32-bit binary value, representing the network layer address of the destination host

Message transmission refers to the process of sending messages out of the computer to other systems.The transmission can be initiated by the L4 layer protocol or by message forwarding.In an in-depth understanding of the Linux Network Technology