Mailinglist Archive: opensuse (807 mails)

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Re: [opensuse] No incoming traffic, but tcpdump shows it is coming in
On Thu, 15 Apr 2010 22:20:46 +0200, Sandy Drobic <opensuse@xxxxxxxxx>
wrote:
On 2010.04.15 19:18, Siniša Bandin wrote:
Hello everyone

Recently it happened to me a few times: switched my motherboard (I do
that
about once in two weeks) and suddenly I cannot access anything on
network

I almost hate to ask, but is this some modern form of cyber sm?!?


Not sure I understand what do you mean by that?

I switch motherboards (and almost everything else in my PC) often, because
I need to test new models before I can sell them to anybody.


(LAN nor Intnet).

Firewall is turned off, iptables shows that everything is ACCEPTed,
ethtool
shows link OK etc.

The strangest thing is that when I run tcpdump in one window, and ping
(or
anything else) in another, tcpdump shows that traffic is going out (ARP
request) and that ARP reply is coming back in, but the rest of the
system
seems to just ignore it. Same thing happened with defaul and XEN
kernels,
both current openSUSE 11.2 standard 2.6.31.12 and bleeding edge
2.6.34-rc3
from KOTD.

Perhaps it is the switch you are connected to and not the box? Something
is
clearly dropping packages, and I guess it is the Switch. Try to reset
it,
so
it relearns which MACs are behind which switch port.



No, it is not the switch, cables, ADSL router, Internet provider...
It happened only in openSUSE, but not in Windows 7 (booted from second
disk) nor Knoppix 6.2 (booted from USB flash).
It happened twice, with two different motherboards, third is coming
tomorrow and I can't wait to see what will happen.
I am writing this on first mb, which started working after three days, I
have just started the system to try (again) to solve the problem, and the
problem was solved, but I don't know how. Second mb is still not working.

I make my living from networking and PC computers and Linux, and I have
seen many things, but this is the first time I see this.

As I wrote, tcpdump shows that packets are coming in, but they seem to get
lost somewhere inside TCP/IP stack


Siniša
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