127.0.0.1与localhost

rhel 5
[root@ns100 vm]# ping localhost
PING localhost.atyu.com (202.106.195.29) 56(84) bytes of data.
64 bytes from 202.106.195.29: icmp_seq=1 ttl=249 time=20.3 ms
64 bytes from 202.106.195.29: icmp_seq=2 ttl=249 time=18.1 ms
64 bytes from 202.106.195.29: icmp_seq=3 ttl=249 time=13.7 ms
64 bytes from 202.106.195.29: icmp_seq=4 ttl=249 time=14.7 ms
--- localhost.atyu.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 7121ms
rtt min/avg/max/mdev = 13.764/16.771/20.382/2.645 ms
[root@ns100 vm]# ping local
ping: unknown host local
[root@ns100 vm]# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.028 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.026 ms
--- 127.0.0.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.026/0.027/0.028/0.001 ms
[root@ns100 vm]#
[root@ns100 vm]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               ns100.atyu.com
OpenBSD 4.2
# ping local                                                            
^C
# ping localhost
PING localhost.yuyizhi.org (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0.495 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=255 time=0.118 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=255 time=0.092 ms
--- localhost.yuyizhi.org ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.092/0.235/0.495/0.184 ms
# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0.189 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=255 time=0.088 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=255 time=0.092 ms
--- 127.0.0.1 ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 0.088/0.123/0.189/0.046 ms
#
# cat /etc/hosts                                                               
#       $OpenBSD: hosts,v 1.11 2002/09/26 23:35:51 krw Exp $
#
# Host Database
#
# RFC 1918 specifies that these networks are "internal".
# 10.0.0.0      10.255.255.255
# 172.16.0.0    172.31.255.255

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