/etc/hosts should be set by default from sysinstall when you have installed FreeBSD, unless you haven't configured your NIC during install.
You haven't set the hostname of the system in /etc/hosts
Usually use this form of setting the hostname of the system in /etc/hosts
Code:
<ip_address> <hostname.domain> <hostname>
<ip_address> <hostname>.
If you used for hostname 'lan' and domain for example 'mydomain' use should add these lines to /etc/hosts (10.35.1.90 in this case should be your ip address)
Code:
10.35.1.90 lan.mydomain lan
10.35.1.90 lan.mydomain.
See also
hosts(5)