[smokeping-users] FPing alternative

[Israel Brewster]

Yep, that patch fixed it - I can now ping all my hosts successfully.  
At least in initial testing, but considering that before I was  
consistently getting lost packets, this looks good. Thank you all very  
much for your efforts and patience, and a special thanks to Tobias for  
coming up with the patch!

-----------------------------------------------
Israel Brewster
Computer Support Technician
Frontier Flying Service Inc.
5245 Airport Industrial Rd
Fairbanks, AK 99709
(907) 450-7250 x293
-----------------------------------------------


On Aug 18, 2008, at 12:19 PM, Tobias Oetiker wrote:

> 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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>>>
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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