Imports github.com/jackpal/go-nat-pmp github.com/ethereum/go-ethereum/logger/glog github.com/huin/goupnp/dcps/internetgateway1 github.com/ethereum/go-ethereum/logger github.com/huin/goupnp/dcps/internetgateway2 github.com/huin/goupnp Standard library imports errors fmt net strings sync time