RE: DDOS anecdotes

[Tim Devries <Tim.Devries () Q9 com>]

-----Original Message-----
From: woods () weird com [mailto:woods () weird com]
Sent: Saturday, June 23, 2001 3:56 PM
To: nanog () merit edu
Subject: RE: DDOS anecdotes



[ On Saturday, June 23, 2001 at 20:04:06 (+0200), Mikael Abrahamsson wrote:
]
> Subject: RE: DDOS anecdotes
>
> This is a real problem. It's not FUD. Microsofts choice to include full
> IP stack capabilities will make the problem worse, but I do not blame
> their IP stack for this like Mr Gibson does though.

> No, their stack's not the root of the problem -- all the rest of their
> OS is (and of course in particular the security model, or lack thereof).


FYI beware of service pack 2.  It sets the DF bit so packets cannot
fragment.  Particularily offensive if your server is on the other side of a
tunnel (due to the overhead).  The solution is to reduce the MTU on the box.
Or use a different OS :)



                                                        Greg A. Woods

+1 416 218-0098      VE3TCP      <gwoods () acm org>     <woods () robohack ca>
Planix, Inc. <woods () planix com>;   Secrets of the Weird <woods () weird com>