TCP Out of Order Packets? Help!

[Andrew Hammond]

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You probably can't turn off auto negotiation in the switch, unless it's
a managed switch. If you turn it off auto negotiation on the card, then
you need to manually set it to 100Mbps half duplex since that's what the
auto negotiation on the switch will default to. If you set it to full
duplex then you will get a duplex miss-match and drop about 50% of your
packets.

Which, incidentally is what this sounds like. Have you gone to each box
and confirmed that it's NIC is configured to use either auto negotiation
or 100/half duplex?

- --
Andrew Hammond    416-673-4138    ahammond-swQf4SbcV9C7WVzo/KQ3Mw at public.gmane.org
Database Administrator, Afilias Canada Corp.
CB83 2838 4B67 D40F D086 3568 81FC E7E5 27AF 4A9A

Ansar Mohammed wrote:
> This typically happens with an old card/new switch or new switch/old card. 
> Turn off auto negotiation on your cards on the Linux/OS/2 and force
> FastEthernet (100Mb/s) If you can do duplex then go for it.
> 
> -----Original Message-----
> From: owner-tlug-lxSQFCZeNF4 at public.gmane.org [mailto:owner-tlug-lxSQFCZeNF4 at public.gmane.org] On Behalf Of Stephen
> Sent: July 3, 2005 3:59 PM
> To: TO Linux User Group
> Subject: [TLUG]: TCP Out of Order Packets? Help!
> 
> I have a home network, connected with an SMB Barricade router. I have a 
> 10.1 Mandrake Linux machine, and OS/2 (eCS) machine, an XP Desktop and 
> an XP latop.
> 
> When transferring data from either XP box to either the Linux od OS/2 
> box I get terrible performance.
> 
> When transferring data to an XP box, I get expected performance for a 
> 100mps LAN.
> 
> I am using ftp, to try to keep things as simple as possible while 
> analyzing the problem (but I want to start using SAMBA as a fle server.
> 
> Since the problem occurs regardless of whether the ftp server is on the 
> linux box or the OS/2 and from either of the XP boxes, I am guessing 
> hardware is not an issue.
> 
> I ran netstat on the OS/2 box (I am still more comfortable in that 
> environment) and found that 60% of the TCP packets were out of order!?
> 
> For a simple LAN this seems absurd. Is this the cause of the bad 
> performance?
> 
> If so, how do I fix.
> 
> Thanks for any and all help!
> 

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