Solve both the Internet access and xshell, and the Internet access

Solve both the Internet access and xshell, and the Internet access
First of all, we need to note that the Network in our school is free, whether in the lab or in the dormitory, so the Internet is allocated IP addresses based on the Mac address, so after I installed centos in VirtualBox, if you want to access the Internet, you need to change the mac address of VirtualBox to the same as that of my laptop, but xshell cannot be connected at this time. If you do not change the mac address of VirtualBox, if you use centos's own IP address, you can use xshell to connect, but you cannot connect to the Internet. After searching, you can find that you can set two network adapters, one for accessing the Internet, one block is used for xshell connection. For example:

Run dhclient eth0 in the command line. The ip address is automatically allocated to eth0. So every time you restart the computer to manually run dhclient eth0 to get the ip, to make it automatically get the need to modify/etc/sysconfig/network-scripts/ifcfg-eth0 after the system starts, change ONBOOT = "no" to ONBOOT = "yes ".

What should I do if I cannot connect to linux using Xshell or Xftp?

You can first test whether the port is opened on port 22 and port 23 of the local telent IP address. If the port is on, change the ssh tool, in some cases, xshell and xftp will be limited first. The security of the two software is not very high. there is basically no problem in the transmission of putty and win_scp.
Another method is to select SFTP when you select protocol during connection creation.

Problem details: for example, I used Xshell ssh to open an AP, but when I printed the output information, it was not found on the AP shell.

Register one by yourself.
It's easy to use VPN.
Two minutes.
There are several items in my Baidu space.
There are also tutorials for applying for Twitter.
Hope to help you.
Easy to use, remember to adopt it ~~