"broadcast ping" message

[John Polstra]

In article <Pine.GSO.4.53.0304152157070.20388 at granville.cs.ubc.ca>,
Kan Cai  <kcai at cs.ubc.ca> wrote:
> 
> This is a really dumb question. When I say it doesn't work, I mean there
> is no output on the screen as you do point-to-point ping normally.
> 
> Actually it works, it won't show anything just because there is no
> ack for broadcasting. Using tcpdump can easily notice this thing.

To make a FreeBSD system respond to broadcast pings, you have to set
the sysctl variable net.inet.icmp.bmcastecho to 1.

John
-- 
  John Polstra
  John D. Polstra & Co., Inc.                        Seattle, Washington USA
  "Disappointment is a good sign of basic intelligence."  -- Chögyam Trungpa