The P2P link works fine. when i turn on the wgb and i ping the wgb i have many packet lost. and when i ping the root br from my Backbone i have also packet lost. and when i turn of the wgb i can ping the root bridge without problems and everything works fine. we have also changed the WGB no changes. the strange thing is when i make a link test or ping test FROM the Root BR to the WGB it looks very good. so i thought that the WGB interference the Bridge behind the Root bridge (there is p2p link with 2 bridges in my backbone) but the channels are 9 and 13 so that couldnt be the problem. i have also entered on the root bridge the bridgespacing of 9km and i have no security. so is there a problem with wgb over large distances 8km?