What is Open VPN :
OpenVPN is a software application. It is open source or free of cost. This software application utilizes Virtual Private Network Process to make secure point-to-point or site-to-site link with routed or bridged plan and also remote access facilities. This Software application utilizes SSL/TLS security system for encoding and it is able to traverse network address translators and firewalls.
Use of Open VPN :
1. It is possible to tunnel any IP subnetwork or virtual ethernet adapter one single UDP or TCP port.
2. Set-up a scalable, load-balanced Virtual Private Network server farm utilizing one or more machines that can manage so many dynamic link from incoming Virtual Private Network clients.
3. You can save your private network traffic with all the encryption, authentication, and certification characteristic of the OpenSSL library.
4. You can utilize any cipher, key size, or HMAC digest permitted by OpenSSL library.
5. You get two option for selection: a. static-key based conventional encryption. b. certificate-based public key encryption.
6. You can Utilize static – pre-shared keys or TLS-based dynamic key exchange.
7. You can handle your link bandwidth utilization with real-time adaptive link compression and traffic-shaping.
8. Make secure ethernet bridges utilizing virtual tap devices.
There are two different process to link system through VPN. Those are :
1.Bridging
2.routing
There are some advantages of Bridging and routing. Those are discussed as follow :
Benefits Bridging :
a. Bridging trust on LAN broadcasts. Such as Windows NetBIOS file sharing and network neighborhood browsing to work.
b. No route declaration to config.
c. Works with any protocol that can work over ethernet, with IPv4, IPv6, Netware IPX, AppleTalk, etc.
d. Comparatively simple-to-configure solution for road warriors.
Bridging disadvantages
Inefficient than routing, and doesn’t scale properly.
Routing advantages
a. Effective and scalability.
b. Permit better tuning of MTU for efficiency.