Failed updates

I saw a bunch of servers overnight fail to update cpanel because of the following error. [2018-05-16 04:58:21 -0400] ***** FATAL: Failed to download updatenow.static from server: The system cannot update the /var/cpanel/sysinfo.config file. at /usr/local/cpanel/Cpanel/GenSysInfo.pm line 113. It looks like there is an invalid option (nospoof on) now present in /etc/host.conf # Lookup names via DNS first then fall back to /etc/hosts. order bind,hosts # We have machines with multiple IP addresses. multi on # Check for IP address spoofing. nospoof on Commenting out this line and running upcp again then goes through. Any clue why this option is present? Eric