Analyze the advantages and disadvantages of tunnel proxy IP.

At present ,IP Suppliers in the agent market have sprung up , Many... Emerged overnight . Vendors offer similar products and services , But each has its own advantages and disadvantages , Quality , It's also worth exploring . For increasingly popular agents IP, How on earth should we choose ？ Now let's share the most commonly used tunnel agent ip Advantages and disadvantages .

Usage flow ：

1、 Layer 1 Tunneling Protocol -PPTP, Point to point tunneling protocol . It is based on ppp A new security enhancement protocol developed by protocol , It supports multi protocol virtual private networks ( replace ip Software ), Through password authentication protocol (PAP) And extensible authentication protocol (EAP) And other ways to improve the security of the network . Remote users can dial ISP Telephone , Connect directly to the Internet or other corporate network security .

2、L2TP It is an industrial standard Internet Tunnel protocol , Its function and PPTP The agreement is basically the same , For example, you can encrypt the network data stream . However ,PPTP The network is required to be IP The Internet ,L2TP Require packets to be point-to-point oriented PPTP Use a channel ,L2TP Using multiple channels L2TP Provide header compression 、 Channel verification ,PPTP I won't support it .

3、 be based on PKI Layer 3 tunneling protocol of Technology -IPSec Protocols are now the basis for building virtual networks , It can be between routers 、 Provide encrypted and authenticated communication between firewalls or between routers and firewalls . Although the implementation is complex , But it is more perfect than other agreements .

Advantages and disadvantages ：

agent IP The advantages of are easier to configure than routers , Various records can be generated in the process of work , Working in the application layer , Various data can be checked , According to certain rules , Generate various logs 、 Record . besides , agent IP It can also filter the data content , Flexible or even complete control of incoming and outgoing flow and content , Provide users with transparent encryption mechanism .

But the agent IP Not perfect , Sometimes the router of the proxy server will be very slow , Not transparent enough for users , Different servers respond to different proxy services . meanwhile , Agent's IP There is no guarantee of breaking through the limitations of all agreements , It often gives customers or processes one or two restrictions .