> You can't really assume this will work. FreeBSD has a sysctl
> to disable responses to broadcast/multicast ICMP-echo requests.
You know what, I tried it with Windows machines, that do not reply to
broadcast ping either, and it worked anyway. What gives?
----- Original Message -----
From: "C. Stephen Gunn" <[EMAIL PROTECTED]>
To: "Renaud Waldura" <[EMAIL PROTECTED]>
Cc: "Patrick Bihan-Faou" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, January 23, 2001 9:33 PM
Subject: Re: How to send arp request with no other traffic
>
> On Tue, Jan 23, 2001 at 06:40:14PM -0800, Renaud Waldura wrote:
>
> > An amusing trick to populate the ARP table is to ping the broadcast
address.
> > Even if hosts do not reply to your ping packet (typically, Windows
> > machines), they are entered in the ARP table.
> >
> > You still have to send a single packet, but it does all the work.
>
> You can't really assume this will work. FreeBSD has a sysctl
> to disable responses to broadcast/multicast ICMP-echo requests.
>
> Exploitation of this "feature" is the basis for several denial
> of service attacks. Spoof the origin address to an layer-3
> broadcast address and voila, amplified responses. :-(
>
> - Steve
>
> --
> C. Stephen Gunn <[EMAIL PROTECTED]> | Waterspout Communications, Inc.
>
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