Public bug reported:

My Ubuntu 20.04 smokeping setup was configured with binary name fping6,
and smokeping 2.7.3-2 which always uses -6.
Using fping 4.2-1 on Ubuntu 20.04 the fping6-probes from smokeping
stopped working.

Using fping 4.0-6 on Ubuntu 18.04 the fping6-probe works as expected.

After some digging, it turns out fping6 and -6 is broken, the program will exit 
with 
'fping6: can't specify both -4 and -6'

root@probe:~# fping6 -6 ipv6.google.com
fping6: can't specify both -4 and -6


fping is working fine, as expected

root@probe:~# fping -6 ipv6.google.com
ipv6.google.com is alive

---

root@probe:~# lsb_release -rd
Description:    Ubuntu 20.04 LTS
Release:        20.04

root@probe:~# apt-cache policy fping
fping:
  Installed: 4.2-1
  Candidate: 4.2-1
  Version table:
 *** 4.2-1 500
        500 http://ch.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

** Affects: fping (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: fping (Debian)
     Importance: Unknown
         Status: Unknown

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https://bugs.launchpad.net/bugs/1875242

Title:
  Do not fail if using fping6 with -6 flag

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