I had noticed before, but today decided to carry out further tests.

In specific, I have problems with some hosts google.

EX: 8.8.8.8 which has the DNS google-public-dns-a.google.com. When I do monitoring by ICMP in the IP address, it correctly returns me icmppingloss item, however if I change to the DNS name, it returns me always 50% icmppingloss.

Also noticed this with the host www.google.com.

The other monitoring tests, this does not happen.

Use ubuntu 14:04 server and zabbix 2.2.6 (package)

Note: This is not supported, it's a bug report. Thank you.