Since DTLS is based on UDP, it is unreliable and there is no flow control to decide its performance; Performance can be determined using DPD packets; When DPD is triggered and no response received, AnyConnect client will start forwarding packets over TLS (assuming TLS is up and DTLS is unhealthy)

TLS is normally implemented on top of TCP in order to encrypt Application Layer protocols such as HTTP, FTP, SMTP and IMAP, although it can also be implemented on UDP, DCCP and SCTP as well (e.g. for VPN and SIP-based application uses). This is known as Datagram Transport Layer Security (DTLS) and is specified in RFCs 6347, 5238 and 6083. or UDP socket (e.g., RDS sockets with [19], or KCM sock-ets [6]), unmodified versions of commonly used user-space libraries for TLS such as gnutls or openssl, which only operate on TCP or UDP sockets, cannot be directly used by the application. The TLS control plane is complex, and there is no support for TLS/DTLS on kernel managed sockets in Oct 31, 2012 · Choose TCP over UDP because you’d rather have all the packets that were sent, in the order that they were sent, than get most / many / some of them earlier. And whether you use TCP or UDP, you can now add TLS-style security protection. I await the arrival of encrypted UDP traffic with some interest. Dec 17, 2018 · With UDP, packets arrive in a continuous stream or they are dropped. Ordering. TCP does ordering and sequencing to guarantee that packets sent from a server will be delivered to the client in the same order they were sent. On the other hand, UDP sends packets in any order. Speed. TCP is slower than UDP because it has a lot more to do.

RFC 4279: “Pre-Shared Key Ciphersuites for Transport Layer Security (TLS)”, adds three sets of new ciphersuites for the TLS protocol to support authentication based on pre-shared keys. RFC 4347 : “ Datagram Transport Layer Security ” specifies a TLS variant that works over datagram protocols (such as UDP).

Aug 13, 2018 · If you want to allow clear-text NFS over TCP and UDP into the server, reconfigure the firewall with the commands below. If you only intend to allow encrypted NFS over stunnel TLS or clear-text TCP (but not UDP), don't run these commands: firewall-cmd --permanent --zone=public --add-service=nfs firewall-cmd --reload

The effect is that users can only connect using TLS or DTLS. They cannot use ICA/HDX, ICA/HDX with Session Reliability, or HDX over WebSocket, without TLS or DTLS. Note: DTLS is not supported with ICA/HDX Audio over UDP Real-time Transport, or with ICA/HDX Framehawk. See Network ports.

1. TLS over UDP - is this according DTLS RFC4347, or is TLS support created with OpenVPN's own UDP transport? 2. is there any real specification existing where you could refer to? 3. When do you think IPv6 would be supported both as carrier & routed inside of tunnel thank you for your responses, Mika Saaranen