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SubjectRe: 100Mbps TCP stalls in 2.1.115
Hi,

On Mon, Aug 10, 1998 at 10:01:46AM +1200, Chris Wedgwood wrote:
[...]
> I only have problems talking to some stacks, fancy stacks like recent
> '95 stacks and perhaps '98 with have scaling, SACK, etc. perform very
> well, not to fancy stacks like 2.0.x and NT blow goats.
>
> A breif (possible inaccurate summary):
> 2.1.x Intel <-> Windows95 + IE4.01SP1 - rocks
> 2.1.x Intel <-> 2.1.x Alpha - sucks
> 2.1.x Intel <-> Windows NT 4sp3 - sucks
> 2.1.x Intel <-> 2.0.x Intel - sucks
> 2.1.x Alpha <-> Anything ? - rocks
>
> Sucks means <= 20k/sec ov a 10Mbit switch network.
>
> Rocks means sustains 800k or greater over the same wire.
>
> More details and trace available upon request. I'm also happy to
> provide shell access (with root and tcpdump) to people I deem
> trustworthy if this will help.

Windoze TCP stacks are buggy.
Once I observed a windoze box sending full size segment in a closed window
and expecting the segment to be rejected.
If the receiver accepts the segment the whole connection stalls:
windoze rejects all packets because they ack a segment which
shouldn't be accepted from microsoft point of view.
A nice decision, isn't it?

However, if you gave me access to your system or provided a tcpdump output
I could spend some time debugging.

Best wishes
Andrey V.
Savochkin

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