u014211079的专栏

At nearly every layer of a network architecture there are several potential protocols that could be used.The 10Mbit Ethernet allows all of these protocols (and more) to coexist on a single cable by me

arp作为Neighboring Subsystem 模块在IPv4上的一种实现，符合Neighboring Subsystem的设计：ARP实现会创建一个表，除了保存一些状态和属性，主要是缓冲ARP的地址。表的定义如下：[ include/net/neighbour.h ]struct neigh_table { struct neigh_table *next; // 所有的协议

ARP的接收函数为arp_rcv：[ net/ipv4/arp.c ]/* * Receive an arp request from the device layer. */static int arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_

The terms L2 address, hardware address, MAC address,  are commonly used to refer to the same concept. In this chapter, wewill mostly use the first term.

对每种Neighboring协议，都要定义一个neigh_ops结构，ARP对应的定义为：[ net/ipv4/arp.c ]static const struct neigh_ops arp_generic_ops = { .family = AF_INET, .solicit = arp_solicit, .error_report = arp_error_report,

The original view of the Internet universe was a two-level hierarchy: the top level the Internet as a whole, and the level below it individual networks, each with its own network number.While this v

When an Ethernet frame is sent from one host on a LAN to another, it is the 48-bit Ethernet address that determines for which interface the frame is destined. The device driver software never looks at