[smokeping-users] FPing alternative

[Tobias Oetiker]

Hi Israel,

I have no such device to test, but I have cobbled togather a patch
that might help ...

try

http://oss.oetiker.ch/smokeping/pub/fping-2.4b2_to-sequence-fix.patch

and let me know if it helps

cheers
tobi



Today Israel Brewster wrote:

> Sorry about resurrecting an old dead thread, but I was wondering if
> there had been any changes in the last few months since the last
> posting, perhaps updates to the fping probe or the like? This
> continues to be an issue for us, and I am not at all happy with the
> work around I have in place (sending 4 pings with a 15 second interval).
>
> To rehash: the problem we are running into is that when using fping
> against certain devices, only one or two packets are returned,
> regardless of device function and number of packets sent. Setting a
> higher packet interval (such at the 15 seconds mentioned previously)
> allows a limited number of additional packets to return, but is not a
> workable solution. From previous discussions, it would appear that the
> issue is with fping not updating the sequence number, but patching
> that issue is beyond my skill level. Thanks!
>
> -----------------------------------------------
> Israel Brewster
> Computer Support Technician
> Frontier Flying Service Inc.
> 5245 Airport Industrial Rd
> Fairbanks, AK 99709
> (907) 450-7250 x293
> -----------------------------------------------
>
>
> On May 19, 2008, at 8:10 AM, Israel Brewster wrote:
>
> >
> >
> >
> > On May 17, 2008, at 11:03 AM, Niko Tyni wrote:
> >
> >> On Sat, May 17, 2008 at 02:20:04PM -0400, Mike Lerley wrote:
> >>
> >>> Fair enough; however, I have turned on and off all options I can
> >>> find on the
> >>> router related to that sort of thing and nothing changes.  More
> >>> importantly,
> >>> I can do this:
> >>>
> >>> root at george:~# ping -f tobeys.gotdns.com
> >>> PING tobeys.gotdns.com (24.39.29.68) 56(84) bytes of data.
> >>> .......................................
> >>> --- tobeys.gotdns.com ping statistics ---
> >>> 3609 packets transmitted, 3570 received, 1% packet loss, time
> >>> 47185ms
> >>> rtt min/avg/max/mdev = 23.229/31.162/72.274/7.039 ms, pipe 6, ipg/
> >>> ewma
> >>> 13.078/27.893 ms
> >>>
> >>> Clearly, there is no packet rate limiting in effect here...
> >>
> >> It's most probably looking at the ICMP sequence number.  While the
> >> 'regular ping' increments the sequence number for each ping, fping
> >> apparently uses is as an index to the hosts it's pinging. So the
> >> first
> >> host gets sequence number 0 for all pings, the second one gets 1 etc.
> >>
> >> The device probably considers the unchanging sequence number an
> >> attack
> >> and stops responding.
> >>
> >> It should be quite easy to patch fping to store the information in
> >> the
> >> payload instead and increase the sequence number like the rest of the
> >> world does. No, no patch at least yet :)
> >>
> >> Cheers,
> >
> > Now that is the best answer I have heard yet- it actually makes sense
> > (to a degree, at least), and fits the observed facts. Any chance of
> > such a patch being written by someone? I'd be happy to test it, if
> > so... Actually, I'd almost be happy to write it, except I don't think
> > my understanding of networks, ping payloads, and how this all works is
> > quite up to the task :).
> >
> > -----------------------------------------------
> > Israel Brewster
> > Computer Support Technician
> > Frontier Flying Service Inc.
> > 5245 Airport Industrial Rd
> > Fairbanks, AK 99709
> > (907) 450-7250 x293
> > -----------------------------------------------
> >>
> >> --
> >> Niko
> >>
> >> _______________________________________________
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> >> smokeping-users at lists.oetiker.ch
> >> https://lists.oetiker.ch/cgi-bin/listinfo/smokeping-users
> >
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>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900