LAN or something.

Generally enter the company has a local area network, you can use ftp://192.168.0.11 this type of access.

This involves two areas of knowledge in general:

First, the view IP, can be viewed through the cmd command ipconfig.

Second, check the physical address, click on the network and Sharing Center to open a local link or wireless Link status, there is a detailed information:

There are physical addresses: IPV4 address, IPv4 subnet mask, what.

Third, what is IPv4, ok I still very impetuous, want to change, Baidu: Http://zhidao.baidu.com/link?url=WcrsOSR5LugfC2TxIClK_ Reeutpvzpxsuimb57qyzudcs4s2iyufzytedf30kp3mqbtf8yhljsq8pjxpqci-c_

Four, through Ping 192.168.1.22 This is: The machine on the network has a unique IP address, we send a packet to the destination IP address, the other side will return a packet of the same size, according to the returned packet we can determine the existence of the target host, Can initially determine the target host operating system, and so on.

2. Let's take a look at some of its common operations. Let's take a look at the Help, type in the DOS window: ping/? Enter, showing the help screen shown in 1. Figure 1
   Here we only have some basic and useful parameters.  
   -T means that packets will be sent uninterrupted to the destination IP until we force it to stop. Imagine, if you use 100M broadband access, and the target IP is 56K kitten, then it will not be long, the target IP is not able to withstand so much data and dropped, hehe, an attack is so simple to achieve.
   -L Defines the size of the sending packet, which defaults to 32 bytes, which we can use to define the maximum to 65500 bytes. Combined with the-t parameter described above, there will be a better effect oh.
   -N defines the number of times a packet is sent to the destination IP, which defaults to 3. If the network speed is slow, 3 times for us also wasted a lot of time, because now our goal is only to determine whether the target IP is present, then define it as a time. Note that if the-t parameter is used with the-n parameter, the ping command is standard with the following parameters, such as "Ping Ip-t-N 3", although the-t parameter is used, but it is not ping all the time, but only 3 pings. In addition, the ping command does not have to ping the IP, you can ping the host domain name directly, so that you can get the host's IP.
   Let us give an example to illustrate the usage, 2. Here time=2 indicates that the time taken from sending a packet to receiving a return packet is 2 seconds, from which you can determine the size of the network connection speed. The return value from the TTL can be initially judged by the Ping host's operating system, the reason is that the "preliminary judgment" is because this value can be modified. Here ttl=32 indicates that the operating system may be win98.
4. Example of using a ping command
   Example of ①ping own machine
   Ping the IP address of this machine, in this case the IP address of this machine is: "10.1.1.253"
   Figure 3
   It's a ping-pass situation.
   Example of ②ping gateway/router (Figure 4)
   Ping the IP address of the gateway/router, in this case the IP address of the gateway/router is: "10.1.1.254" Figure 4 is the case of Ping Pass
   Example of a ③ping hub router (Figure 5)
   The IP address of the central switch in the ping Center "202.120.119.254" 5 is a condition of ping pass
   ④ping Center Home Server Example (Figure 6)
   Ping Center's home server's domain name "www.cc.shu.edu.cn" 6 is a condition of ping pass
   ⑤ping Shanghai University Home Server example (Figure 7)
   Ping Shanghai University's homepage server's domain name "www.shu.edu.cn" 7 is the case of Ping Pass
   ⑥ping Shanghai Jiaotong University Home Server example (Figure 8)
   Ping Shanghai Jiaotong University's homepage server's domain name "www.sjtu.edu.cn" 8 is the case of Ping Pass
   ⑦ping China Education and Research network server example (Figure 9)
   Ping China Education Research network Server domain name "www.edu.cn" 9 is the case of Ping Pass
   Examples of ⑧ping (Fig. 10)
   Ping the IP address of the gateway/router, in this example, the IP address of the gateway/router is: "10.1.1.254" 10 is the case that the ping does not pass
5. Analysis of return information after Ping
   1.Request timed out
   This is the message that we often encounter, many articles say this is the other machine set up the filter ICMP packet, from the above working process, this is not exactly correct, at least there are several situations.
   Figure: Analysis of return information after Ping
   (1) The other side has been shut down, or there is no such address on the network: for example, in host a ping 192.168.0.7, or Host B shutdown, in host a ping 192.168.0.5 will get the timeout information.
   (2) The other party is not in the same network segment, through the route can not find the other side, but sometimes the other side does exist, of course, does not exist is also the return timeout information.
   (3) The other party does exist, but ICMP packet filtering (such as firewall settings) is set.
   How to know the other side is there, or does not exist, you can use the ping command with the parameter-A to detect the other side, if you can get the other side of the NetBIOS name, it means that the other side is present, there is a firewall settings, if not, most of them do not exist or shut down, or not in the same network segment.
   (4) Error setting IP address
   Under normal circumstances, a host should have a network card, an IP address, or multiple network cards, multiple IP addresses (these addresses must be in a different IP subnet). However, if a computer's "Dial-up network adapter" (equivalent to a soft network card) of the TCP/IP settings, set a network card with the IP address of the same subnet IP address, so in the IP layer protocol, this host has two different interfaces in the same network segment. When you ping other machines from this host, there is a problem:
   A. The host does not know which network interface The packet is sent to, because there are two network interfaces connected to the same network segment.
   B. The host does not know which address to use as the source address for the packet. Therefore, from this host to Ping other machines, the IP layer protocol will not be processed, after the timeout, Ping will give a "timeout no answer" error message. However, when the host is ping from other hosts, the request packet from the specific network card, ICMP only need to simply swap the purpose, the source address, and change some flags, the ICMP reply packet can be sent smoothly, the other host will be able to successfully ping this machine.
   2.Destination Host Unreachable
   (1) The other party is not in the same network segment, and he does not set the default route, such as the above example in a machine does not set the default route, run Ping 192.168.0.1.4 will appear "Destination host unreachable".
   (2) The cable is out of fault
   Here to illustrate the difference between "destination host unreachable" and "Time Out", if the routing table of the routed router has a route to the destination, and the destination is unreachable for other reasons, "Time Out" appears. If there are no routes in the routing table that reach the destination, then "destination host unreachable" appears.
   3.Bad IP Address
   This message indicates that you may not be connected to a DNS server, so this IP address cannot be resolved, or the IP address may not exist.
   4.Source Quench received
   This information is very special, it appears very little chance. It indicates that the other or Midway server is busy and unable to respond.
   5.Unknown host--Unknown Host
   This error message means that the name of the remote host cannot be converted to an IP address by the domain name server (DNS). The cause of the failure may be a domain name server failure, or its name is incorrect, or the network administrator's system and the remote host communication line is faulty.
   6.No answer--No response
   This failure indicates that the local system has a route to the central host but does not receive any information it sends to the central host. The cause of the failure may be one of the following: The central host is not working, the local or central host network is not configured correctly, the local or hub router is not working, the communication line is faulty, and the hub host has routing problems.
   7.Ping 127.0.0.1:127.0.0.1 is a local loop address
   If this address does not ping, the local machine TCP/IP protocol does not work correctly.
   8.no rout to host: NIC is not working properly
   9.transmit failed,error code:10043 NIC driver is not working properly

LAN or something.