nanog mailing list archives

Re: identify hostname


From: Jonathan Mischo <supertaz () mindspring net>
Date: Thu, 3 Dec 1998 19:27:28 -0500 (EST)

theoretically speaking.

-Taz

--
Jonathan "Taz" Mischo -- Network Slave -- supertaz () mindspring net
Mindspring Enterprises, Inc.  1430 W. Peachtree St. Suite 400
Atlanta, GA  30309   1.800.719.4664 x2705  404.287.0770 x2705
fax: 404.287.0885 pager: pagetaz () netops mindspring net M-F2-10pET

On Thu, 3 Dec 1998, Roeland M.J. Meyer wrote:

That won't work for them because you are using the same data to build
filters. In fact, you can do it in a script, automate the whole thing..

At 06:29 PM 12/3/98 -0500, Jonathan Mischo wrote:
this makes sense...until someone gets lazy, and takes a week to filter,
and the smurf brats catch on, and start querying DNS to find amplifiers.

-Taz

--
Jonathan "Taz" Mischo -- Network Slave -- supertaz () mindspring net
Mindspring Enterprises, Inc.  1430 W. Peachtree St. Suite 400
Atlanta, GA  30309   1.800.719.4664 x2705  404.287.0770 x2705
fax: 404.287.0885 pager: pagetaz () netops mindspring net M-F2-10pET

On Thu, 3 Dec 1998, Roeland M.J. Meyer wrote:

At 11:32 AM 12/2/98 -0700, Pete Kruckenberg wrote:
I do have an access list deny for incoming destinations to *.*.*.255
since I do know that the only customer we have with larger than a /24
from us (via cw.net) also happens to have nothing larger than /26 in
their network.  AFAIK, today, smurfers are only using *.*.*.255.  They
would have to track a lot more information to use others, so for now I
can generally expect that deny to prevent us from being an amplifier. 

It's not difficult to find subnet broadcast addresses, since few routers
(if they even support it) are configured to filter ICMP replies. If there
isn't already software out there, it will take all of a few hours to add
broadcast-finding code to the smurfing software in existence.

Guys,

Why not make your down-stream fill out a *complete* IN-ADDR.ARPA file which
lists their sub-net bcast and base addresses? That way yo could use the DNS
system itself to find those addresses.
___________________________________________________ 
Roeland M.J. Meyer, ISOC (InterNIC RM993) 
e-mail: <mailto:rmeyer () mhsc com>rmeyer () mhsc com
Internet phone: hawk.mhsc.com
Personal web pages: staff<http://www.mhsc.com/~rmeyer>.mhsc.com/~rmeyer
Company web-site: <http://www.mhsc.com/>www.mhsc.com
___________________________________________________ 
Who is John Galt?
"Atlas Shrugged" - Ayn Rand



___________________________________________________ 
Roeland M.J. Meyer, ISOC (InterNIC RM993) 
e-mail: <mailto:rmeyer () mhsc com>rmeyer () mhsc com
Internet phone: hawk.mhsc.com
Personal web pages: staff<http://www.mhsc.com/~rmeyer>.mhsc.com/~rmeyer
Company web-site: <http://www.mhsc.com/>www.mhsc.com
___________________________________________________ 
Who is John Galt?
"Atlas Shrugged" - Ayn Rand




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