Hi ppl Discovered still my issue lay unresolved by sify. Need to know what are null packets? The service agent tells me I am having slow downloads and browsing issues due to null packets sent by computer. How do I tell he is telling the truth?He took half an hour to come up with an explanation like that by chkg connection status.He advises to format my computer or get a new LAN card. What do you have to say?After 5 days of futile and exhaustive follow up I am informed about it.Computer has been scanned for viruses, trojans and spyware and nothing was found. Computer has AMD Athlon 2400+ XP processor and 728 MB RAM. System resources are at max.I am a noob at all this and help appreciated.Thanks avinds for explaining what is duplex.Cheers all!