Solved

Digging into VPN. How ISP determines that it's Remote access VPN traffic?

Posted on 2015-02-14
6
106 Views
Last Modified: 2015-02-14
How ISP determines that it's Remote Access VPN traffic?
What about network protocols which are used for VPN?
What about roles of switches on VPN.
0
Comment
Question by:Nusrat Nuriyev
  • 4
  • 2
6 Comments
 
LVL 93

Assisted Solution

by:John Hurst
John Hurst earned 500 total points
ID: 40609786
Simply, VPN passes TCP/IP packets that are encrypted. So the same rules apply at each end with regard to packets. The encryption is only in the tunnel.

Switches pass traffic at each end in a normal fashion.

I am not sure what an ISP knows about VPN. Generally VPN is independent of ISP, except that ISP's (and Hotels and like) can determine that VPN is being used (not see what is inside) and upcharge for it.

The VPN packets have header bytes that will say it is VPN and some of the characteristics of the overall packet.
0
 

Author Comment

by:Nusrat Nuriyev
ID: 40609987
Wait, you mean switch or routers?
Or the VPN scheme virtually may be like this?
office_1 <switch/router> ISP_1 <-> internet <-> ISP_2 <switch/router> office_2
Could you please explain what does mean tunnel?
0
 
LVL 93

Assisted Solution

by:John Hurst
John Hurst earned 500 total points
ID: 40609988
VPN forms an encrypted tunnel inside the middle internet portion . That is done to secure the data. The encapsulation is called a tunnel.
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 

Author Comment

by:Nusrat Nuriyev
ID: 40609996
So, up to ISP, it goes unencrypted? But how the ISP network equipment determine that it must be encrypted after it?

Does VPN technology form new packet and put the original TCP packet inside of the payload of new packet with new header?  Does VPN make an envelope with encrypted content on top of TCP packet?

Could we say that VPN is an just ecnrypts connection  and affects to all protocols on computers on both sides, comparing with HTTPS which secures only HTTP?
0
 
LVL 93

Accepted Solution

by:
John Hurst earned 500 total points
ID: 40610035
how the ISP network equipment determine that it must be encrypted after it?

The ISP has nothing to do with the encryption, encapsulation, or tunnel. That is up to the VPN (Virtual Private Network) hardware or software on each end.

Does VPN technology form new packet and put the original TCP packet inside <-- More or less, yes. and that is what isolates from the ISP.

VPN is not HTTPS at all. Apples and oranges.

The VPN encrypts at one end and unencrypts at the other end. The overall traffic is just TCP/IP.
0
 
LVL 93

Expert Comment

by:John Hurst
ID: 40610064
@Nusrat Nuriyev  - Thank you and I was happy to help. VPN (in the detail) is complicated. Good luck with your learning about it.
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
OSPF Design NSSA 5 62
Layer 2 versus layer 3 10 89
Cisco Firewall setup within a managed office 8 92
RV042 site to site vpn can ping but not access server via rdp 6 28
Configuring network clients can be a chore, especially if there are a large number of them or a lot of itinerant users.  DHCP dynamically manages this process, much to the relief of users and administrators alike!
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
Viewers will learn how to properly install and use Secure Shell (SSH) to work on projects or homework remotely. Download Secure Shell: Follow basic installation instructions: Open Secure Shell and use "Quick Connect" to enter credentials includi…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question