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?

  • Not all VPN tunnels are encrypted. Some of my clients use VPN tunneling just to deal with addressing. I understand that British Telecoms ADSL structure uses L2TP just for addressing. kitz.co.uk/adsl/equip2.htm
    – jonathanjo
    Jan 15, 2020 at 17:34

2 Answers 2


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.

Example uses:

  1. Run IPv6 network over IPv4-only infrastructure.
  2. Connect “internal security zone” networks over “external” routers.
  3. 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.

  • The "external" network (e.g. Internet) might not even care about your QoS scheme & flags at all.
    – Zac67
    Jan 15, 2020 at 7:22

No guarantees of low latency or jitter unless that is provided by the underlay or transport network.

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