On Tue, 16 Jul 2002, Alex Dyas wrote:

> I've attached a tcpdump of a Linux machine doing the same thing
> (working.txt).
>
> the same 0 sized window can be seen:
>
> 17:15:56.094161 linuxbox.foo.com.3479 > solarisbox.foo.com.telnet: . ack 456
> win 5840 <nop,nop,timestamp 176027347 193370834> (DF) [tos 0x10]
> 17:16:12.634540 solarisbox.foo.com.telnet > linuxbox.foo.com.3479: . ack 74
> win 0
> 17:16:12.634540 linuxbox.foo.com.3479 > solarisbox.foo.com.telnet: . ack 456
> win 5840 <nop,nop,timestamp 176029001 193370834> (DF) [tos 0x10]
>
> but the Linux telnet session does not freeze up as the BSD one does.
>
> Again, any help would be most appreciated.
>
> Thanks again,
>
> Alex...

As Barney noted, the behavior of both OSes looks very similar.

Have you run tcpdump on the solaris box at the same time?  That win 0
packet looks _really_ suspicious to me; it doesn't share the DF bit or
timestamps of the other packets in the stream.  On top of that, I see no
reason why a win 0 should be sent when the previous window was ~24K in
size.  Is it possible that the NAT box is adding it in?

Mike "Silby" Silbersack



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