2.4.0 TCP SYN problem

2.4.0 TCP SYN problem

[Marek Gresko]

Every SPARC/Solaris machine completely ignores every TCP/SYN segment sourced 
from my linux 2.4.0 machine. Is it problem of kernel or missconfiguration? Or 
does Solaris something wrong?

I have used the kgcc (egcs-2.91.66) on my Red Hat 7.0 linux box for compiling 
the 2.4.0 kernel.

Problem appears also when not starting any firewall or packet scheduler.

SYN segments really reach the Solaris machine. I have used tcpdump on a 
router closest to the Solaris machine. But no response is seen. Also netstat 
on the Solaris machine doesn't report any SYN segment arrival.

When I initiate connection from Solaris machine everything goes OK. 
TCP/SYN,ACK segments are OK.

Can anyone help me?

Thanx
				Marek Gresko
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Re: 2.4.0 TCP SYN problem

[David S. Miller]

   From: Marek Gresko <gresko@kmit.sk>
   Date: 	Fri, 5 Jan 2001 18:16:34 +0100

   When I initiate connection from Solaris machine everything goes OK. 
   TCP/SYN,ACK segments are OK.

   Can anyone help me?

Does:

bash# echo "0" >/proc/sys/net/ipv4/tcp_ecn

Fix the problem?  If so, please send a bug report to Sun telling them
that they improperly discard IP packets using ECN.

Later,
David S. Miller
davem@redhat.com
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Re: 2.4.0 TCP SYN problem

[Lukasz Trabinski]

In article <200101060050.QAA09725@pizda.ninka.net> you wrote:

>   When I initiate connection from Solaris machine everything goes OK. 
>   TCP/SYN,ACK segments are OK.

>   Can anyone help me?

> Does:

> bash# echo "0" >/proc/sys/net/ipv4/tcp_ecn

Or maybe it?
echo "1" > /proc/sys/net/ipv4/ip_no_pmtu_disc

-- 
*[ Łukasz Trąbiński ]*
SysAdmin @wsisiz.edu.pl
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