A VPN tunnel is end to end encrypted. But does it gurantee to provide features other than encryption, such as low latency, low jitter etc?
Tunnels change the network topology. They let routers A and B be logically adjacent even if they don’t have a physical connection. They also let you run one type of network over another type of network.
- Run IPv6 network over IPv4-only infrastructure.
- Connect “internal security zone” networks over “external” routers.
- Logically connect slave devices (such as access points) to a controller.
A VPN tunnel is a tunnel with encryption. So it has all the features of a tunnel while adding data secrecy.
Low latency and low jitter are not on the tunnel or VPN tunnel feature list. The act of encapsulating /encrypting /decrypting may increase latency and jitter. The encrypted traffic may also cause QOS flags in the original traffic to not be visible to the underlying network infrastructure.