raw packet optimization

[bilalcaliskan]

currently we are generating raw packets with below options, need to optimize them:

// build tcp/ip packet
	ip := layers.IPv4{
		SrcIP:    srcIP,
		DstIP:    dstIP,
		Version:  4,
		TTL:      64,
		Protocol: layers.IPProtocolTCP,
	}

	srcport := layers.TCPPort(666)
	dstport := layers.TCPPort(22)
	tcp := layers.TCP{
		SrcPort: srcport,
		DstPort: dstport,
		Window:  1505,
		Urgent:  0,
		Seq:     11050,
		Ack:     0,
		ACK:     false,
		SYN:     false,
		FIN:     false,
		RST:     false,
		URG:     false,
		ECE:     false,
		CWR:     false,
		NS:      false,
		PSH:     false,
	}