Inconsistent results/errors on FreeBSD about fping

I can reproduce the same problem. this is really annoying because since zabbix use fping to check if hosts are alive, it leads to many false positive. what ever, can someone explain me when [printf( " error while sending ping: %s\n", strerror( errno ) );] line 1581 is displayed using fping command? in which situation coz i am not C programer and can't understand....

i can also confirm that this only happen with 3.4 version of fping on freebsd systems and only occur with hosts down located in the same network. i have tried with 3.4 fping version (compilled from source) on linux ubuntu and didn't get thoses errors. This is very strange

After many hours of testing this lead me to say that fping (3.4 others version?....) is not compatible with freebsd :
Any way to correct that bug?

here is the synthesis :

Different tests using Fping 3.4 (port or manually source compiled) on freebsd (9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825)

Scenario : the host we want to fping is not alive

A) Cases
case 1) :
fping ip_hostdown when ip_hostdown is not located on local network :
result is ALWAYS = ip_hostdown is unreachable

case 2)
fping ip_hostdown when ip_hostdown is located on local network :

result is very rarely = ip_hostdown is unreachable

result is almost always (mainly if i give consecutive tries):
ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

ip_hostdown error while sending ping: Host is down

......
......

==> fping get stuck and never stop if i don't ctrc-c
When i ctrl-c to stop stucked fping ==> ^Cip_hostdown is unreachable

B) source code fping 3.4 : "error while sending ping" is in source code fping.c line 1581
"Host is down" doesn't come from fping source code.

C) Linux test (many version of kernel/distribution) with compiled version of fping 3.4
result is always : ip_hostdown is unreachable

[schweikert]

duplicate of #30