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On Mon, 29 Nov 2004, Rutger T. wrote: > Dear group, > > I have a few questions regarding OpenVPN that I hope that you may help > answer: 1) Is OpenVPN a transport layer protocol? (At least that's what > I gathered from reading the FAQ....) Yes. > 2) OpenVPN supports VoIP (UDP) > traffic right? Yes. > 3) Finally, and most importantly, how much overhead is > added to each encrypted packet by OpenVPN? (i.e. How much additional per > packet overhead is there for using OpenVPN?) It varies depending on options. With a TUN-style tunnel over UDP using the default TLS options, the per-packet overhead is: 41 bytes security layer overhead (includes packet tag (1), HMAC-SHA1 signature (20), initialization vector (16), sequence number (4)) 28 bytes tunneling overhead (includes IP + UDP header) Total: 69 bytes per packet If your data stream is compressible, you can potentially gain back all of this overhead. James ____________________________________________ Openvpn-users mailing list Openvpn-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/openvpn-users |