ping: unknown host - BUT there an entry in /etc/hosts!
# tail -5 /etc/hosts
172.16.7.40 syslog-lx
172.16.7.40 prw123
# ping syslog-lx
ping: unknown host syslog-lx
# ping 172.16.7.40
172.16.7.40 is alive
0
# tail -5 /etc/hosts
172.16.7.40 syslog-lx
172.16.7.40 prw123
# ping syslog-lx
ping: unknown host syslog-lx
# ping 172.16.7.40
172.16.7.40 is alive