Mailing List Archive: server don't accept ip-connections from linux

server don't accept ip-connections from linux

Dec 13, 2006, 6:23 AM

Post #1 of 3 (349 views)

hello,
i have a big problem: some servers send a rst-packet or don't answer if i
want to open a connection with them.

this happens with the web-server with ip 15.200.6.123 and my smc-
barricade router/printserver.

if i make a connection from windows or linux with kernel 2.2, it works, with
kernel 2.4, i get a rst or no answer and the connection is closed.

i don't know, what is the difference of the tcp-packets from windows/kernel
2.2 and linux with kernel 2.4. but with kernel 2.4 i have trouble with some
servers.

i check the packets with an analyser and make some test. if i disable ecn
with "echo 0x0 > /proc/sys/net/ipv4/tcp_ecn" it works, with ecn enabled, it
don't work.

goodby

Schau auch einmal auf meine Homepage (http://go.to/dieter-ferdinand).
Dort findest du Information zu Linux, Novell, Win95, WinNT, ...

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Re: server don't accept ip-connections from linux [ In reply to ]

ecki at lina

Dec 13, 2006, 2:14 AM

Post #2 of 3 (358 views)

Permalink

In article <457FD55E.13765.202391D@dieter.ferdinand.gmx.de> you wrote:
> i check the packets with an analyser and make some test. if i disable ecn
> with "echo 0x0 > /proc/sys/net/ipv4/tcp_ecn" it works, with ecn enabled, it
> don't work.

this is a problem on the remote site (old firewall software), nothing we
(linux kernel) can do about it. You might want to inform the owner of the
server about that.

Gruss
Bernd
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Re: server don't accept ip-connections from linux [ In reply to ]

harlan at artselect

Dec 13, 2006, 4:12 PM

Post #3 of 3 (359 views)

Permalink

On Wed, Dec 13, 2006 at 10:26:38AM +0000, Dieter Ferdinand wrote:
> i don't know, what is the difference of the tcp-packets from windows/kernel
> 2.2 and linux with kernel 2.4. but with kernel 2.4 i have trouble with some
> servers.
>
> i check the packets with an analyser and make some test. if i disable ecn
> with "echo 0x0 > /proc/sys/net/ipv4/tcp_ecn" it works, with ecn enabled, it
> don't work.

With kernel 2.6.17.13 or higher, you can limit the scaling factor for
that broken host with:

THEIR_IP=1.2.3.4
MY_GATEWAY=5.6.7.8

ip route add $THEIR_IP/32 via $MY_GATEWAY window 65535

which limits window scaling for that destination without interfering
with your other connections.

--Pete
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