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From: Adam Carter <Adam.Carter@optus.com.au>
To: "gentoo-user@lists.gentoo.org" <gentoo-user@lists.gentoo.org>
Date: Thu, 25 Jun 2009 17:10:23 +1000
Subject: RE: [gentoo-user] Machine doesn't respond to broadcast ping.
Thread-Topic: [gentoo-user] Machine doesn't respond to broadcast ping.
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> > I've got one machine here on the LAN which isn't responding to broadcas=
t
> > ping. Any idea why not?
>
> You need to set icmp_echo_ignore_broadcasts to 0.  Default is
> 1, mainly for dos prevention:
>
> # sysctl net.ipv4.icmp_echo_ignore_broadcasts=3D0

I thought it would default to off in most OSes these days, because of;
http://en.wikipedia.org/wiki/Smurf_attack

Are those other machines patched up?