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### Solve the problem of insufficient 254IP addresses in the intranet

Many times the enterprise local area network appears the private network address 192.168.1.x-255 not enough, remove a broadcast address and a network address. (0 is the network number is not available, 255 is the broadcast address, except the 2, can be used is 254 addresses)

191, for example, 172.161.1. The first and second numbers are network numbers, and the remaining two numbers are the numbers of the local computer. In binary format, a Class B IP address consists of two bytes of network address and two bytes of host address. The maximum bit of network

address consists of two bytes of network address and two bytes of host address. The highest bit of network address must be "10" and the address range is from 128.0.0.0 to 191.20.255. There are 16382 available class B networks, each of which can accommodate more than 60 thou

address consists of two bytes of network address and two bytes of host address. The highest bit of network address must be "10" and the address range is from 128.0.0.0 to 191.20.255. There are 16382 available class B networks, each of which can accommodate more than 60 thou

### Linux Shell script automatically modifies the IPaddress and the ipaddress of the linuxshell script

\$ IPADDR | awk-F. '{print \$1 ". "\$2 ". "\$3 }''. 254 ">>\$ ETHCONF Echo "This IP address Change success! " Else Echo-n "This \$ ETHCONF is static exist, please ensure Change Yes or NO ": Read I Fi If ["\$ I" = "y"-o "\$ I" = "yes"]; then Read-p "Please insert ip Address

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address consists of two bytes of network address and two bytes of host address. The highest bit of network address must be "10" and the address range is from 128.0.0.0 to 191.20.255. There are 16382 available class B networks, each of which can accommodate more than 60 thou

hosts.2. Class B IP AddressA Class B IP address consists of two bytes of network address and two bytes of host address. The highest bit of network address must be "10" and the address

address consists of two bytes of network address and two bytes of host address. The highest bit of network address must be "10" and the address range is from 128.0.0.0 to 191.20.255. There are 16382 available class B networks, each of which can accommodate more than 60 thou

address and broadcast address. In this example, the number of binary hosts is 8 bits.Number of hosts = 28-2 = 254(2) overall calculationThe above example is used together to calculate the process as follows:Example 2: IP address 128 · 36 · 199 · 3The subnet mask is 255 · 25

Internet, each IP address consists of two identification codes (IDS), the network ID and the host ID, for easy addressing and hierarchical construction of the network. All hosts on the same physical network use the same network ID, and one host on the network (including workstations on the network, servers, routers, etc.) has a host ID corresponding to it. The Internet Board defines 5 types of

Class:0xxx XXXX. x/8, that is, 1 ~ 127, 126 available. Because 0. x indicates all networks; 127. x/8 indicates the Back-to-loop address and the TCP/IP protocol test address. =>10. x/8 is a private address. Class B:10xx XXXX. x/16, that is, 128 ~ 191. =>172.16.x.x ~ 172.31.x.x is a private

" and the subnet mask as "255.255.255.0". Among them, "1" has 24, representing the corresponding IP address to the left 24 bits is the network number; "0" has 8, representing the corresponding IP address to the right of the 8-bit is the host number. In this way, the subnet mask determines which of the 32-bit binary dig

As we all know, IP is made up of four numbers, here, let's first look at the Class 3 commonly used IPClass A IP segment 0.0.0.0 to 127.255.255.255Class B IP segment 128.0.0.0 to 191.255.255.255Class C IP segment 192.0.0.0 to 223.255.255.255　　The default subnet mask assigned by XP is only 255 or 0 per segmentClass A def

c class network 192.168.0.0~192.168.255.255 255 A network that uses a reserved address can only communicate internally, not with other networks. Because the reserved address in this network may also be used by other networks, if the network interconnection, then the search for routes will be due to the address is not

change within the range of 255, so 256 IP addresses can be provided. However, the actual number of available IP addresses is 256-2, that is, 254, because the host number cannot be "0" or all "1 ". 2. The subnet mask is a network of "255.255.0.0". The two numbers can be 0 ~ Any change within the range of 255 can provide 2552

be "10 ". In a class B ip address, the network ID is 14 bits and the host ID is 16 bits. The class B network address is applicable to networks of medium scale and other scales, each network can accommodate more than 60 thousand computers. 　　 3): Class c ip Address 　　 A Cl

is 14 bits and the host ID is 16 bits. The class B network address is applicable to networks of medium scale and other scales, each network can accommodate more than 60 thousand computers.3): Class c ip AddressA Class c ip address refers to the network number in the four segments of the

to obtain 15 available subnets ). You can see that when the number of hosts in each subnet is small, you can use this method to save IP resources and obtain more subnets. In actual use, for example, if you assign an IP address to the devices at both ends of a point-to-point connection, if you assign an IP

I was so happy to receive two CDs of Ubuntu7.10, each of which is 32-bit and 64-bit, sent by the Netherlands free mail. It took more than an hour to successfully install it on the old machine. Because the school IP address is bound to the MAC address, the old machine cannot obtain the IP

### How to obtain the IPaddress of a user through a web site: HTTP_X_FORWARDED_FOR test _ PHP Tutorial

[intranet] '; If (preg_match ('/^ 192 \. 88 \. 99/', \$ ip ))Return 'Listen 6to4 relay ';If (preg_match ('/^ 192 \. 0 \. 2 \./', \$ ip ))Return 'test-NET-1, document and Example ';If (preg_match ('/^ 192 \. 0 \. 0 \./', \$ ip ))Return 'reserved (IANA )';If (preg_match ('/^ 192 \. 0 \. 0 \./', \$ ip ))Return 'reserved (IAN

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