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Network Security Security-Basics
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Re: DOS Attack?

Subject: Re: DOS Attack?
Date: Fri, 26 Nov 2004 06:46:42 -0700
Shawn Wall wrote:

Hi List,

I'm currently experiencing network outages due to what appears to be DOS
attacks. I'm running a wireless ISP using a Cisco 2611 and CBAC and I have a
/24 public address range. During the outage I can see traffic from a single
external host sending thousands of packets to a single internal host. I
don't have port 80 inbound open in my ACLs so I don't understand how the
external host is even able to contact the internal host to begin with.
Secondly, how is it possible for an attack on 1 internal host to cripple the
rest of my network? Any feedback would be welcome. Thanks.

shawn





How are you viewing this traffic? Could it be spoofed from the inside? Are there any abnormal broadcasts occurring?

Anthony Boynes

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