Home page logo
/

nanog logo nanog mailing list archives

Re: Things to do to make the network better
From: Pete Ashdown <pashdown () xmission com>
Date: Mon, 5 Jan 1998 10:55:28 -0700 (MST)

Owen DeLong said once upon a time:

I will also point out that many of the recent "smurf" attacks and
similar problems people are having on the net would be gone if people
would just carefully filter internal/external addresses on their
border machines, that is, prevent packets claiming to be from "inside"
networks from coming in from the "outside", and prevent packets
claiming to be from "outside" networks from going out from the
"inside". The latter will stop your network from *ever* being the
source of a wide variety of packet forgery attacks, and is necessary
to being a good network citizen. The former will stop your network
from being the subject of a wide variety fo packet forgery attacks,
and is necessary to make your customers even remotely safe on the net.

Expecting everyone else to do the right thing is the wrong way to solve the
problem.  99% of everyone else will always do the easiest thing, which is
nothing.

That's great if you're a downstream provider with no transit customers.
However, when you become a transit provider, it becomes much more difficult
to determine inside vs. outside, since you're more in the middle between
two "outsides" that pass traffic through you.

Use customer configurable filters.  There is no excuse for becoming less
responsible as you grow larger.


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]