Re: Denial of service attacks apparently from UUNET Netblocks

[Karl Denninger <karl () mcs net>]

No.  This was a transmission of 1K packets and was not in the style of any
previously-seen attack that I'm aware of.  Its a new thing.

There was no attempt to SYN flood, or hit broadcast addresses, or use
source-routing.  All of that is protected against fairly well here.  This
was a simple "the machines are on a 10Mbps pipe, so hit them with 30Mbps of
traffic and flood their NIC ports to the point that they're useless".

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On Tue, Oct 07, 1997 at 07:01:34AM -0400, Dan Foster wrote:
> Hot Diggety! Doug Davis was rumored to have said...
> > 19:56:56.854432 snap 0:0:0:8:0 37.31.237.183.1900 > 206.66.14.112.57039: S 674719801:674719801(0) win 65535 (ttl 
> > 21, id 13333)
> > 19:56:56.854432 snap 0:0:0:8:0 76.167.191.100.1900 > 206.66.14.112.57040: S 674719801:674719801(0) win 65535 (ttl 
> > 21, id 13334)
> > 19:56:56.854432 snap 0:0:0:8:0 131.254.10.213.1900 > 206.66.14.112.57041: S 674719801:674719801(0) win 65535 (ttl 
> > 21, id 13335)
> > 19:56:56.855409 snap 0:0:0:8:0 74.60.41.73.1900 > 206.66.14.112.57042: S 674719801:674719801(0) win 65535 (ttl 21, 
> > id 13336)
>
> Ouch...painful. A whole lot of SYNs with forged source address, eh? Hmm...
> interesting. Karl, if I might ask - did your attack originate from any specific
> port, like 1900 as is listed here?
>
> I'm just curious since I'd like to get a rough idea if there's some program
> other than smurf.c out there that makes use of a specific port by default,
> or if this is just a one time occurence by a few separate idiots.
>
> And as usual, thanks for the heads up from folks on NANOG.
>
> -Dan Foster
> Frontier Internet
> Internet: dsf () frontiernet net