From: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2005@gmx.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] arp flood (offtopic?)
Date: Wed, 19 Oct 2005 22:09:40 +0000 [thread overview]
Message-ID: <4356C424.80009@gmx.net> (raw)
In-Reply-To: <032b01c5d4bb$a8837ed0$020c0c0a@admin>
Alex schrieb:
> Now the thing is that the load average goes up to 30 and the gateway
> doesn't even respond to ping after a while.
> The arp-requests are not only for ips that are assigned to hosts but
> even for un-allocated ips in the same subnet.
Ah. Classical problem. There are only two realistic explanations for it:
- the source of the arp flood is scanning the local net
- the source of the arp flood has been infected with a virus.
In my experience, only viruses generate real floods, scans are much more
friendly to the network. So just clean the viruses from the flooding
machines.
> Maybe dividing into multiple vlans would be a better idea?
Yes, that would somewhat help, but not solve the problem completely.
Besides, I'd go for fixing the real problem instead of some symptoms.
Regards,
Carl-Daniel
--
http://www.hailfinger.org/
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next prev parent reply other threads:[~2005-10-19 22:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-19 14:44 [LARTC] arp flood (offtopic?) Alex
2005-10-19 14:51 ` Carl-Daniel Hailfinger
2005-10-19 18:04 ` Marek Kierdelewicz
2005-10-19 20:55 ` Alex
2005-10-19 22:09 ` Carl-Daniel Hailfinger [this message]
2005-10-20 8:33 ` Oscar Mechanic
2005-10-20 22:19 ` Peter Surda
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