Understanding Linux Network Internals 2005 phần 4 docx

... which can assume 4, 096 different values, allows a network device, for example, to have up to 4, 096 different bridge IDs sharing a single MAC address. Before, this would have required 4, 096 different ... now only 4 bits in size. For backward compatibility, the bridge priority range is still 0- 64 K, but since you have only four bits to play with, you now have priorities in incremen...

Ngày tải lên: 13/08/2014, 04:21

... 14. Bridging: Concepts Section 14. 1. Repeaters, Bridges, and Routers Section 14. 2. Bridges Versus Switches Section 14. 3. Hosts Section 14. 4. Merging LANs with Bridges Section 14. 5. ... Version 4 (IPv4) Chapter 18. Internet Protocol Version 4 (IPv4): Concepts Section 18.1. IP Protocol: The Big Picture Section 18.2. IP Header Section 18.3. IP Options Secti...

Ngày tải lên: 13/08/2014, 04:21

... are examples of the model in Figure 5 -4( b). The model in Figure 5 -4( a) can be seen as a special case of the other two. 5.9.2. Interaction with the Kernel Network Stack Virtual devices and real ... "Memory Optimizations." 7.1 .4. Use of Boot Options to Configure Network Devices In light of what we saw in the previous sections, let's see how the networking code uses bo...

Ngày tải lên: 13/08/2014, 04:21

... values shown in Figure 9 -4. As avg_blog hits one of the thresholds shown in the figure, cng_level changes value. The definitions of the NET_RX_XXX enum values are in include /linux/ netdevice.h, and ... register it. Thanks. Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com 10 .4. 4. Old Versus New Driver Interfaces Now that the meaning of the NAPI-related fields of th...

Ngày tải lên: 13/08/2014, 04:21

... multiple of 4 bytes (the size of an IP address). [*] [*] (40 -3) /4= 9, where 40 is the maximum size of the IP options, 3 is the size of the options header, and 4 is the size of an IPv4 address. [*] ... values (ipv4_devconf_dflt). The meanings of its fields are covered in Chapters 28 and 36. ipv4_config structure While ipv4_devconf structures are used to store per-device configurati...

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... (208.201.239.36) 56( 84) bytes of data 64 bytes from www.oreillynet.com (208.201.239.36): icmp_seq=0 ttl=50 time= 245 ms 64 bytes from www.oreillynet.com (208.201.239.36): icmp_seq=1 ttl=50 time= 244 ms For ... configuration Performance Transition from IPv4 networks to IPv6 networks Security Naturally, the committees designing the new protocol have tried to keep IPv4 and IPv6 as compati...

Ngày tải lên: 13/08/2014, 04:21

... confirmation from the L4 layer and the setting of the state to NUD_REACHABLE does not affect traffic in any way. Note that the correlation between the two packets in Figure 26- 14 could not be performed ... have any knowledge of data streams. This is why the L4 layer takes care of the confirmation. TCP SYN/ACK exchanges are only one example of an L4 protocol providing external confirmation...

Ngày tải lên: 13/08/2014, 04:21

... 28. Table 29 -4. Kernel variables and associated files in /proc/sys/net/ipv4/conf subdirectories Kernel variable nameFilenameDefault value for IPv4/IPv6 ipv4_devconf.arp_announce arp_announce 0 ipv4_devconf.arp_filter arp_filter 0 ipv4_devconf.arp_ignore arp_ignore 0 ipv4_devconf.medium_id medium_id 0 ipv4_devconf.proxy_arp proxy_arp 0 As ... NET_XXX values in include /linux/ sysctl.h. ARP,...

Ngày tải lên: 13/08/2014, 04:21

... configured subnets. For example, the command arp -s 10.0.0.1 11:22:33 :44 :55:66 adds the mapping of 10.0.0.1 to 11:22:33 :44 :55:66 to the ARP cache. This command would be rejected by the kernel ... Notifications" in Chapter 32). 34. 3.1. Adding a Route The insertion of a new route is taken care of by fn_hash_insert, whose logic is described in Figures 34- 3(a) and 34- 3(b). [*] This...

Ngày tải lên: 13/08/2014, 04:21

... subjects. Philip Dangler was the production editor, and Audrey Doyle was the copyeditor for Understanding Linux Network Internals. Sada Preisch proofread the book. Mary Brady and Colleen Gorman provided ... http://www.simpopdf.com ICMP, list of IPv4, list of L4 protocols, list of neighboring subsystem, list of network device initialization, list of networking, list of notific...

Ngày tải lên: 13/08/2014, 04:21