PPPOE_DEV = 'eth[0-9]|br[0-9]' : 'wrong device, please choose either an ethernet device (eth*) or an ethernet based  bridge device (br*)'
PPPOE_TYPE = 'sync|async|in_kernel' : 'wrong pppoe type, choose one of async, sync or in_kernel'
PPPOE_MTU = 'RE:[5-9][0-9][0-9]|1[0-3][0-9][0-9][0-9]|14[0-8][0-9]|149[0-2]' : 'must a number between 500 and 1492'
PPPOE_MRU = 'RE:[5-9][0-9][0-9]|1[0-3][0-9][0-9][0-9]|14[0-8][0-9]|149[0-2]' : 'must a number between 500 and 1492'
FRITZDSL_TYPE = 'fcdsl|fcdslsl|fcdsl2|fcdslusb' : 'wrong modem type, please choose one of fcdsl, fcdsl2, fcdslusb or fcdslsl'
FRITZDSL_MTU = 'RE:[5-9][0-9][0-9]|1[0-3][0-9][0-9][0-9]|14[0-8][0-9]|149[0-2]' : 'must a number between 500 and 1492'
FRITZDSL_MRU = 'RE:[5-9][0-9][0-9]|1[0-3][0-9][0-9][0-9]|14[0-8][0-9]|149[0-2]' : 'must a number between 500 and 1492'
PPTP_MODEM = 'bbaa|bcaa|mxstream|xdsl' : 'wrong modem type, please choose one of bbaa, bcaa, mxstream or xdsl'
FRITZDSL_PROVIDER = 'U-R2|ECI|Siemens|Switzerland|Belgium|Austria1|Austria2|Austria3|Austria4' : 'wrong type of provider, please choose U-R2, ECI, Siemens, Switzerland, Belgium, Austria1, Austria2, Austria3 or Austria4'
PPTP_PCLOGLVL = '[0-2]' : 'wrong log level specification, use 0 (low), 1 (default) or 2 (high)'
PPTP_PC_TO = '[0-9].[0-9][0-9]|10.00' : 'wrong timeout, use 0.00-10.00 (with two digits after the dot; 0.00 - no buffering at all)'