{"", "::1", &IPAddr{IP: ParseIP("::1")}, nil},           // Go 1.0 behavior

	{"ip4:icmp", "", &IPAddr{}, nil},

	{"l2tp", "127.0.0.1", nil, UnknownNetworkError("l2tp")},
	{"l2tp:gre", "127.0.0.1", nil, UnknownNetworkError("l2tp:gre")},
	{"tcp", "1.2.3.4:123", nil, UnknownNetworkError("tcp")},

	{"ip4", "2001:db8::1", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}},

	network, proto, err := parseNetwork(ctx, sd.network, true)
	if err != nil {
		return nil, err
	}
	switch network {
	case "ip", "ip4", "ip6":
	default:
		return nil, UnknownNetworkError(sd.network)
	}
	ctrlCtxFn := sd.Dialer.ControlContext
	if ctrlCtxFn == nil && sd.Dialer.Control != nil {
		ctrlCtxFn = func(ctx context.Context, network, address string, c syscall.RawConn) error {

			ip = ip[:IPv4len]
		}
	}
	switch net {
	case "tcp", "tcp4", "tcp6":
		addr = &TCPAddr{IP: ip, Port: port}
	case "udp", "udp4", "udp6":
		addr = &UDPAddr{IP: ip, Port: port}
	default:
		return nil, UnknownNetworkError(net)
	}
	return addr, nil
}

func startPlan9(ctx context.Context, net string, addr Addr) (ctl *os.File, dest, proto, name string, err error) {
	var (
		ip   IP
		port int
	)

		if laddr != nil && len(laddr.IP) != 0 && laddr.IP.To4() == nil {
			return nil, &AddrError{Err: "non-IPv4 local address", Addr: laddr.String()}
		}
	case "tcp", "tcp6":
	default:
		return nil, UnknownNetworkError(sd.network)
	}
	if raddr == nil {
		return nil, errMissingAddress
	}
	fd, err := dialPlan9(ctx, sd.network, laddr, raddr)
	if err != nil {
		return nil, err
	}

		network = "ip"
	}
	afnet, _, err := parseNetwork(context.Background(), network, false)
	if err != nil {
		return nil, err
	}
	switch afnet {
	case "ip", "ip4", "ip6":
	default:
		return nil, UnknownNetworkError(network)
	}
	addrs, err := DefaultResolver.internetAddrList(context.Background(), afnet, address)
	if err != nil {
		return nil, err
	}
	return addrs.forResolve(network, address).(*IPAddr), nil
}

	var sotype int
	switch net {
	case "unix":
		sotype = syscall.SOCK_STREAM
	case "unixgram":
		sotype = syscall.SOCK_DGRAM
	case "unixpacket":
		sotype = syscall.SOCK_SEQPACKET
	default:
		return nil, UnknownNetworkError(net)
	}

	switch mode {
	case "dial":
		if laddr != nil && laddr.isWildcard() {
			laddr = nil
		}
		if raddr != nil && raddr.isWildcard() {
			raddr = nil
		}

			}
			if portnum, err = r.LookupPort(ctx, net, port); err != nil {
				return nil, err
			}
		}
	case "ip", "ip4", "ip6":
		if addr != "" {
			host = addr
		}
	default:
		return nil, UnknownNetworkError(net)
	}
	inetaddr := func(ip IPAddr) Addr {
		switch net {
		case "tcp", "tcp4", "tcp6":
			return &TCPAddr{IP: ip.IP, Port: portnum, Zone: ip.Zone}
		case "udp", "udp4", "udp6":