North American Network Operators Group
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Re: [nsp] known networks for broadcast ping attacks

  • From: Jay R. Ashworth
  • Date: Wed Jul 30 15:46:30 1997 
On Wed, Jul 30, 1997 at 07:56:11PM +0100, Alex.Bligh wrote:
> Urm, 192.41.177.255 is the MAE-East LAN ?! Are you saying attacks are
> being mounted from here or people are attacking this LAN (not
> sure which is more worrying)

What he's saying is that someone is mounting broadcast ping flooding
attacks with forged source addresses which make them appear to be
coming from MAE-East, among other places.

He correctly notes that this _must_ be fixed at the boundary routers.

Network operators: _please_ make sure your boundary routers do not
allow you to send packets upstream which have source addresses on them
which are not on your networks.  Filters are your friend.  A source
address of 127.anything is pretty uncool, too, as are broadcast
addresses... although those can be harder to figure out nowadays.

Cheers,
-- jra
-- 
Jay R. Ashworth                                                [email protected]
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