nanog mailing list archives
Re: smurf's attack...
From: DAVE NORDLUND <nordlund () ccstaff cc ukans edu>
Date: Fri, 5 Sep 1997 15:41:00 CST-600
Date: Fri, 05 Sep 1997 14:04:17 -0600 From: "Michael K. Sanders" <msanders () aros net> Subject: Re: smurf's attack... To: Jon Green <jcgreen () netins net> Cc: "Jordyn A. Buchanan" <jordyn () bestweb net>, nanog () merit edu
In message <199709051945.OAA26522 () worf netins net>, Jon Green writes:On Fri, 5 Sep 1997 15:24:58 -0400, jordyn () bestweb net writes:access-list XXX deny ip any 0.0.0.255 255.255.255.0Folks, this is a bad idea. There are lots of completely valid IP addresses out there that end in .255. True, most of them that end in .255 ARE broadcast addresses, but if people implement this kind of filtering on a large scale, it really breaks classless IP.Likewise, not all broadcast adresses necessarily end with .255, so filtering .255 won't help anyway in the presence of something like a /25 with a X.X.X.127 broadcast.
Agreed but it is not easy for a hacker to determine CIDR masks. It is my impression that the only thing being sent is classfull broadcasts.
Dave Nordlund d-nordlund () ukans edu University of Kansas 913/864-0450 Computing Services FAX 913/864-0485 Lawrence, KS 66045 KANREN
Current thread:
- smurf's attack... Network Administrator (Sep 05)
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- Re: smurf's attack... Jay R. Ashworth (Sep 05)
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- Re: smurf's attack... David Papp (Sep 05)
- Re: smurf's attack... Jordyn A. Buchanan (Sep 05)
- Re: smurf's attack... Jon Green (Sep 05)
- Re: smurf's attack... Jordyn A. Buchanan (Sep 05)
- Re: smurf's attack... Rick Summerhill (Sep 05)
- Re: smurf's attack... Michael K. Sanders (Sep 05)
- Re: smurf's attack... DAVE NORDLUND (Sep 05)
- Re: smurf's attack... Jordyn A. Buchanan (Sep 05)
- Re: smurf's attack... Michael K. Sanders (Sep 05)
- Re: smurf's attack... Randy Bush (Sep 05)
- Re: smurf's attack... Jordyn A. Buchanan (Sep 05)
- Re: smurf's attack... Dave Andersen (Sep 06)
- Re: smurf's attack... Randy Bush (Sep 05)
- Message not available
- Re: smurf's attack... Jay R. Ashworth (Sep 05)
- Re: smurf's attack... Dave Bergum (Sep 05)
- Re: smurf's attack... Phil Howard (Sep 05)
- Re: smurf's attack..i Steve Noble (Sep 05)
- Re: smurf's attack... Wayne Bouchard (Sep 05)