altri filtri
	• ip[6:2] & 0x2000 != 0 • ip[6:2] & 0x1fff > 0 • ip and ip[12:4] = ip[16:4] • ip and ip[19] = 0xff • icmp[0] != 8 and icmp[0] != 0 • tcp and (tcp[13] & 3 != 0) • tcp and (tcp[13] & 3 = 3)