一次虚拟机ping不通的问题---ifcfg-eth0中的prefix设置错误

一次虚拟机ping不通的问题---ifcfg-eth0中的prefix设置错误

该虚拟机是新安装的，安装的是RHEL6.7操作系统，安装时指定了ip地址是192.168.80.190，不过怎么也ping不通，当时的ifconfig如下：

[root@localhost ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:6E:3B:60
inet addr:192.168.80.190  Bcast:192.168.80.255  Mask:255.255.255.255---->>>注意此处
inet6 addr: fe80::20c:29ff:fe6e:3b60/64 Scope:Link
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:1698 errors:0 dropped:0 overruns:0 frame:0
TX packets:415 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:114615 (111.9 KiB)  TX bytes:33449 (32.6 KiB)

lo        Link encap:Local Loopback
inet addr:127.0.0.1  Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING  MTU:65536  Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:688 (688.0 b)  TX bytes:688 (688.0 b)

[root@localhost ~]#

感觉mask有点问题，于是检查ifcfg-eth0

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
TYPE=Ethernet
UUID=9bebf63f-cd84-4fc7-aa2f-5517506c5dc2
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=none
HWADDR=00:0C:29:6E:3B:60
IPADDR=192.168.80.190
PREFIX=32--->>>>>>>此处是32,而我能正常ping通的rhel6.3中，PREFIX=24
GATEWAY=192.168.80.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
[root@localhost ~]#

于是把PREFIX=24，ifdown eth0，ifup eth0之后，就可以ping通了，如下是改之后的ifconfig的输出：

[root@localhost ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:6E:3B:60
inet addr:192.168.80.190  Bcast:192.168.80.255  Mask:255.255.255.0--->>>注意此处。
inet6 addr: fe80::20c:29ff:fe6e:3b60/64 Scope:Link
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
RX packets:1698 errors:0 dropped:0 overruns:0 frame:0
TX packets:415 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:114615 (111.9 KiB)  TX bytes:33449 (32.6 KiB)

lo        Link encap:Local Loopback
inet addr:127.0.0.1  Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING  MTU:65536  Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:688 (688.0 b)  TX bytes:688 (688.0 b)

[root@localhost ~]#