[ipoe]
lua-file=/config/accel-ppp/ipoe.lua
interface=eth1,shared=1,mode=L2,ifcfg=1,start=dhcpv4,ipv6=1,username=lua:username_func

#!lua
  function username_func(pkt)
    local username=pkt:hwaddr()
    return username
end

set service ipoe-server lua-file <path_to_lua_file>
set service ipoe-server interface eth1 lua-username <username_func>