[linux-audio-user] Unencrypted remote X11 app, Was: headless audio apps

It's probably because you use X11 over ssh. If you ssh from machine A into machine B , normally ssh forwards the X11 protocol too , just look at $DISPLAY if it's something like localhost:10.1 then you are using ssh. While the nice advantage of ssh is that you don't have to fiddle with xhost to authorize the remote host to display on your local machine and at the same time all X11 traffic is encrypted (so even a potential sniffer on the LAN would not be able to figure out what you type on the keyboard etc) the big drawback is that encryption is relatively CPU heavy. And since audio apps have all those nice peak meters, scroll waves in real time on the screen etc, you can imagine that this causes lots of requests to the X server which translates into lots of X traffic which in turn needs to be encrypted if it runs over ssh. If you want to run remote X11 apps over an unencrypted connection do the following: you can still ssh from machine A to machine B. then do: on machine A: (where you want to display the output of the app) xhost +IP_OF_MACHINE_B eg xhost +192.168.0.2 (this tells the X server running on machine A that machine B is allowed to display on machine's A screen) on machine B do: export DISPLAY=IP_OF_MACHINE_A:0.0 eg export DISPLAY=192.168.0.1:0.0 (the export DISPLAY=.... command tells to X apps running on machine B that they should send the X11 output to the IP of machine A) Keep in mind that X11 normally runs over TCP port 6000 thus make sure that this port is open on machine A or at least place an iptables rule to open TCP port 6000 so that machine B can connect to. (check your firewall settings) Now when you run an application on machine B the X11 traffic is forwarded at full wire speed of your connection without causing too much additional load. cheers, Benno http://www.linuxsampler.org robin fell wrote: