Mon Apr 02, 2012 5:45 am by salski
My subnet mask is 255.255.240.0 which indeed means that many computers can be in the same subnet. I checked with the subnet calculator that the computer are indeed in the same subnet (subnet ID of 91.154.112.0). I do not "own" +1200IPs. Instead, as mentioned before, my connection is bridged so that every computer gets an public IP. Currently the IPs are always from the same subnet (though no guarantees are in place of course).
Furthermore, the device I'm experiencing problems with (91.154.117.59) is able to see other computers in my network (I have XBMC UPnP in place). Those other computers can access the serviio content beatifully. I think this proves that the issue is not about the IPs or subnets.