Frames problems

Applications IP Networking
1

I'm using ethereal to analyse my network from my pc.

There're too many TCP Bad checksum

  1. between my PC and unix servers (checksum: 0x6660 [incorrect, should be 0xa6e2])
  2. between my PC and other servers (windows, novell) checksum: 0x6644 [incorrect, should be 0xf50a])

There're too many NBNS and BOOTP/DHCP Malformed Packet(Exception occured)

  1. multicast (224.0.0.2) from switch [Illegal NetBIOS name]

  2. multicast (224.0.0.2) from switch [BOOTP Unknown BOOTP message type (0)Malformed Packet]

  3. Are these problems "acceptable" or not?

  4. How to find if these problems come from my pc or from net?

  5. Are there a software problem (Application layer) or a TCP/IP stack problems, how to find them?

  6. In which ways should I analyse to find solution?

Best reagrds
nymus