On Tue, Oct 28, 2008 at 05:30:55PM -0700, Nigel Smith wrote:
> Hi Matt.
> Ok, got the capture and successfully 'unzipped' it.
> (Sorry, I guess I'm using old software to do this!)
> 
> I see 12840 packets. The capture is a TCP conversation 
> between two hosts using the SMB aka CIFS protocol.
> 
> 10.194.217.10 is the client - Presumably Windows?
> 10.194.217.3 is the server - Presumably OpenSolaris - CIFS server?

All correct so far

> Using WireShark,
> Menu: 'Statistics > Endpoints' show:
> 
> The Client has transmitted 4849 packets, and
> the Server has transmitted 7991 packets.
> 
> Menu: 'Analyze > Expert info Composite':
> The 'Errors' tab shows:
> 4849 packets with a 'Bad TCP checksum' error - These are all transmitted by 
> the Client.
> 
> (Apply a filter of 'ip.src_host == "10.194.217.10"' to confirm this.)
> 
> The 'Notes' tab shows:
> ..numerous 'Duplicate Ack's'
> For example, for 60 different ACK packets, the exact same packet was 
> re-transmitted 7 times!
> Packet #3718 was duplicated 17 times.
> Packet #8215 was duplicated 16 times.
> packet #6421 was duplicated 15 times, etc.
> These bursts of duplicate ACK packets are all coming from the client side.
> 
> This certainly looks strange to me - I've not seen anything like this before.
> It's not going to help the speed to unnecessarily duplicate packets like
> that, and these burst are often closely followed by a short delay, ~0.2 
> seconds.
> And as far as I can see, it looks to point towards the client as the source
> of the problem.
> If you are seeing the same problem with other client PC, then I guess we need 
> to 
> suspect the 'switch' that connects them.

I have another switch on the way to move to. I will see if this helps.

Thanks for your input

Matt

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