As always i prefer the fast way....
When I was trying to install smokeping to make some tests to get latencies i found i had to compile it from sources and install some weird CPAN(perl) dependencies etc etc etc.... horrible to make a 5min-test.
So I "borrowed" some packages from here and from there..... and finally we have all the packages to make a "yum install smokeping" without problems.
This is the old 2.6.8 version so, mainly, forget ipv6 support.
As always, for CentOS 6, at enetres repo.