On Di, 24.08.2004, 17:36, Josh Wyatt sagte: >> tunnel at layer 2 can be really useful when it comes to bandwidth and/or latency matters. >> > > There is already a tool to do layer-2 bridging with encryption. Check out vtun: > > http://vtun.sourceforge.net/ > > I use it a great deal to do layer-2 bridging. It works with the kernel tun/tap > driver and works very well. It can use TCP or UDP as the transport, offers > compression, etc. Key management is up to you, however. > As it uses tun/tap I assume compression/encryption is done in user-space, which means increased latency (I want to use it von IP/Video-telephony). As VIA claims the PadLock function of the Nehemia cores achieves 12,5 GBit/s with AES at 1 GHz CPU speed and a TDP of 7 Watts, using a encryption in kernel-space with the PadLock function would mean that you can en-/decrypt several 100 MBit/s tunnels with a 200,- EUR ITX-machine - without big latency! Rene
