[smokeping-users] Re: fping issue?

Dmitry Melekhov dm at belkam.com
Wed Feb 15 13:19:02 MET 2006

Dez Cadena wrote:

>I had some non-responsive fping targets in my config so I tried both 
>ping and fping from the command line.
>Same target, same options (5 packets, 64bytes size, 1sec between packets):
>fping produced 100% packet loss (as expected)
>ping produced 0% packet loss (!)
I have absolutely the same problem over one of our links.

fping -b 1500 is unreachable

ping  -s 1500
PING ( 1500(1528) bytes of data.
1508 bytes from icmp_seq=1 ttl=254 time=24.9 ms


fping -b 12 is alive

I looked into packets and see that there is difference in content.
This is 2Mbit hdlc link betwee cisco 3660 and 1751...

Strange but true...

>AFAIK, both fping and ping send ICMP echo requests so how come the same 
>target is responsive through
>ping and non-responsive through fping? Any ideas? The target is a cisco 
>26xx router.

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