+ config_get unit "$1" unit
+ [ -z "$unit" ] && {
+ unit="$pppdev"
+ if [ "${ifname%%[0-9]*}" = ppp ]; then
+ unit="${ifname##ppp}"
+ [ "$pppdev" -le "$unit" ] && pppdev="$(($unit + 1))"
+ else
+ pppdev="$(($pppdev + 1))"
+ fi
+ config_set "$1" ifname "ppp$unit"
+ config_set "$1" unit "$unit"
+ }