Re: Help! Slug takes down my network ...

Thanks for the reply Jon. Slug is configured with a
fixed IP address. I did run ethereal from one of my
computers, but since my router has 4 switched ports,
ethereal couldn't see the packets the Slug was
sending. As I said in my initial email, I did see in
ethereal that my router was ignoring ARP requests for
the router IP address while the flooding was going on.
I have two network hubs but both are switches and
wouldn't allow me to sniff the packets the Slug is
sending. I guess I could go buy a simple hub or even a
cross-over cable to see what the packets are, even
though I'd rather not put more money into this
project.

If I decide to break down and buy a hub, I'll let you
know what kind of packets I see.

Thanks

Nathan
--- Jon Pounder <jonp-PJXPO3/4scSsTnJN9+BGXg@xxxxxxxxxxxxxxxx> wrote:

---------------------------------


I would grab something like ethereal and sniff the
network while this is
happening. Just because the network light is flashing
does not mean the
network is saturated. That will tell you what is
actually going on so you
know where to look to fix it.

I would suspect a couple of things but there could be
more:

- networking is just broken and it is flooding the
network with bad
packets (jabber), if you have a switch or a good hub,
it might be able to
partition things on its own and isolate the trouble.

- my most likely guess is that somehow the slug has
grabbed a dhcp address
it shouldn't have, like the gateway, and the two nics
are just fighting
over the ip. This causes the other computers not to
work since they have
no gateway.

Even though I use dhcp for stuff like this, I still
hard code the mac
addresses of the devices so they get specific ip
addresses, but I can
manage them without going to every device and changing
it.


>
>
> Well I thought I finally had my Slug under control.
With the help of
> these Yahoo groups I've figured out how to clear
hung backup jobs
> and I've been successfully backing up three
computers on my home
> network. I got ssh and sudo installed for secure
root access. I got
> ntpclient running per the HOWTO so it keeps good
time.
>
> Then this morning my wife complained she could not
print from her
> laptop. I verified this and also noticed she could
no longer access
> the internet nor even bring up a Windows Explorer
window.
>
> On a whim I pull out the Ethernet cable from my
Slug. All of a
> sudden her computer works again, printing and
surfing. I plug the
> Slug back into the network and it stops. I notice
while the Slug is
> plugged in the network light on it is blinking
constantly and so is
> the light for that port on my SMC 7004AWBR wireless
router. I also
> notice none of the other computers in the house
work.
>
> An Ethereal trace from one computer shows my router
has stopped
> responding to ARP requests. If I unplug the Slug,
ARPs work again.
>
> The Slug is running Unslung 3.18 and it does respond
to the power
> button and shuts down. If I reboot it without the
external drive
> attached it seems to boot up but immediately starts
flooding the
> network again.
>
> The previous night I had made the /unslung changes
to get ntpclient
> to work per the HOWTO. I rebooted then and verified
everything
> worked. I also disabled UPnP that night. My backup
jobs all ran fine
> from midnight to 3 am, while I was alseep, which I
verified by
> checking the backup log through the Admin web GUI
about 7 am.
>
> So in between 7 am and 9 am the Slug started this
flooding behavior
> all by itself and has not recovered.
>
> Any ideas what could be going on? I've spend many
hours in the wiki
> and searching forums to get this thing working in
the first place as
> a backup device. It is frustrating that it only
worked well for a
> few days.
>
> Since it is flooding the network I assume I can't
use the Linksys
> Setup to flash it back to factory. Is there anything
I could do at
> the Redboot prompt to recover? What about the
Sercomm utility?
>
> Will this be a stable backup device for my network
in the longterm?
> It is nice that it is a cool little Linux box to
play with, but I
> did buy it to do an important job.
>
> Thanks for any advice.
>
> Nathan
>
>
>
>
>
> [ Moderator Note: All static information is slowly
moving to the Wiki at
> http://www.nslu2-linux.org ]
> Yahoo! Groups Links
>
>
>
>
>
>
>
>


Jon Pounder

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