Your message dated Thu, 12 Apr 2007 01:10:43 -0400
with message-id <[EMAIL PROTECTED]>
and subject line no need to keep this open
has caused the attached Bug report to be marked as done.
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(administrator, Debian Bugs database)
--- Begin Message ---
Package: iputils-ping
Version: 20020927-3
Hi!
I need to say up front that I'm not sure about the methods I'm taking here,
but there sure is some potential for confusion.
What I did was simply to ping a broadcast address in order to discover
connected hosts:
ping -c1 -b 192.168.55.255
The problem is that ping here exits when it gets the first reply. Looking at
the manpage, I see the '-w' argument, which looks useful, but even with it,
ping exits as soon as it receives the number of replies it expects. Here is
also the error: when broadcasting, you can't know how many answers might
come, so it shouldn't finish before it times out.
There is also a sentence in the manpage that was obviously not written with
broadcast addresses in mind, it says "Duplicate packets should never
occur,...". Pinging a broadcast address without -c parameter will give you
those duplicates.
I think at least the manpage deserves an update, but currently the -b option
is pretty useless due to the other shortcomings.
cheers
Uli
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--- End Message ---
--- Begin Message ---
Most modern ICMP/IP implementations aren't going to respond to broadcast
pings anyway, so pinging a broadcast address in an attempt to discover
hosts is going to produce dubious results. You're likely to get better
results with a "ping sweep" over all the unicast addresses on the
network.
Resolving this bug, as I don't believe any aspect of ping's behavior
should change.
noah
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