Mailinglist Archive: opensuse (882 mails)

[Greg Freemyer <greg.freemyer@xxxxxxxxx>]

On Fri, Dec 3, 2010 at 10:04 AM, İsmail Dönmez <ismail@xxxxxxxxxxx> wrote:
> On Fri, Dec 3, 2010 at 4:19 PM, James Wright <jamfwright@xxxxxxxxx> wrote:
> > I generally do something like this:
> >
> > for host in 10.1.0.{1..254}; do fping $host; done
>
> How about ping -b 255.255.255.255 ?
>
> Regards,
> ismail

I don't think you can trust pings of the broadcast IP.

================================
On my network:
Both
ping -b 255.255.255.255
and
ping -b 10.0.1.255

 only show 5 hosts:

===
WARNING: pinging broadcast address
PING 10.0.1.255 (10.0.1.255) 56(84) bytes of data.
64 bytes from 10.0.1.249: icmp_seq=1 ttl=64 time=0.289 ms
64 bytes from 10.0.1.248: icmp_seq=1 ttl=255 time=0.311 ms (DUP!)
64 bytes from 10.0.1.183: icmp_seq=1 ttl=64 time=1.21 ms (DUP!)
64 bytes from 10.0.1.2: icmp_seq=1 ttl=64 time=1.22 ms (DUP!)
64 bytes from 10.0.1.3: icmp_seq=1 ttl=64 time=2.20 ms (DUP!)
===

But:
fping -g 10.0.1.0/24 -a -s -c 1 -r 1

Reports 24 IPs in use:
===
     256 targets
      24 alive
     232 unreachable
===

which seems a lot more realistic in my office.

fyi: the broadcast ping is missing both openSUSE and windows machines
at a minimum.  Seems to get routers and printers.

Greg


broadcast is only showing 5 machines.



-- 
Greg Freemyer
Head of EDD Tape Extraction and Processing team
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer
CNN/TruTV Aired Forensic Imaging Demo -
   
http://insession.blogs.cnn.com/2010/03/23/how-computer-evidence-gets-retrieved/

The Norcross Group
The Intersection of Evidence & Technology
http://www.norcrossgroup.com
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