@dimka_88 this patch is base on master befor your patch with accept-blank-service ... and work with all old device ( send only service-name that device send to accel-ppp service, problem is come when device receive list of service-name : test1 , test2 ,test3 . device reject query and not connect to accel (problem device from dlink,tp-link and other company) after this patch and receive only one service-name work perfect) ... may be need to small rewrite to clear code but work perfect . i try to make options to use per vlan this options but for now work only global on section [pppoe] : accept-null-sn=1