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Checksum errors On My iMac

347 Views 1 Reply Latest reply: Jul 2, 2013 7:58 AM by longst RSS
Wgeckster Calculating status...
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Feb 27, 2012 11:13 AM

In Wireshark I am discovering these checksum errors:

 

Header checksum: 0x0000 [incorrect, should be 0x47d2 (maybe caused by "IP checksum offload"?)]

 

 

What is the snifficance of these errors? Could this mean the NIC is going bad?

 

 

I tryied connecting with the wireless NIC and everything looks clean on my iMac.

Macbook, iMac 3.06 Ghz 21.5" & G4 Desktop, Mac OS X (10.6.4), 1.83 Ghz Core Duo, G4 Power Mac Dual 1.425 Ghz & iMac 3.06 Ghz i
  • longst Calculating status...
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    Jul 2, 2013 7:58 AM (in response to Wgeckster)

    I have the same issue. And I also found that I constantly have "DNS look up failed" from chrome and safari, when I try to reach some website.

     

    When I have this type of error, if I try to use nslookup in terminal or traceroute in terminal. I could find properly route to the website.

     

    Moreover I found that it seems that the chrome try to do a DNS lookup via 8.8.8.8, this TCP communication has this type of error message from wireshare trace

     

    Header checksum: 0x0000 [incorrect, should be 0x7ee9 (may be caused by "IP checksum offload"?)]

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